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Commercial distribution of PVC thermal stabilisers from the Zhejiang ZPC Sales Co., Ltd. product range is organised around methyltin mercaptide, liquid barium-zinc, liquid calcium-zinc, and solid calcium-zinc chemistries. These stabiliser classes are converted on production-scale equipment including counter-rotating twin-screw extruders with 25:1 to 36:1 length-to-diameter ratios, four-roll calenders with friction ratios of 1.05:1 to 1.15:1, reciprocating-screw injection-moulding machines with clamp forces between 1000 kN and 4000 kN, and plastisol dip-moulding tanks with controlled viscosity ageing. The processing windows cited below are referenced to ISO 182-1, ISO 182-2, ISO 1163-1, ASTM D638-14, and DIN 75201 test protocols; published data for individual commercial grades from the Zhejiang ZPC Sales Co., Ltd. range is limited to technical data sheets and third-party laboratory reports, and therefore the numerical ranges are representative PVC formulation values rather than product-specific certifications.A rigid PVC-U pipe dry blend containing methyltin mercaptide stabiliser at 0.4–1.2 phr is processed on a parallel counter-rotating twin-screw extruder with screw diameter between 65 mm and 132 mm and length-to-diameter ratio between 25:1 and 36:1. Barrel set temperatures are typically held at 150 °C in the feed zone, 165 °C in the compression zone, and 175–185 °C in the metering zone, while the adapter and die are maintained at 195–205 °C to avoid melt fracture. Early yellowing is governed less by gross stabiliser loading than by local shear heating, regrind ratio, and filler particle size distribution. Surface-treated calcium carbonate at 5–15 phr reduces plate-out but narrows the thermal window because calcium carbonate increases melt viscosity and shear heat in the screw tip and spider legs. When regrind levels exceed 20–40 wt%, the heat history of the polymer raises conjugated polyene sequence concentration, and the organotin mercaptide must both neutralise liberated HCl and displace labile allylic chlorine atoms. A dynamic torque rheometer run at 190 °C and 32 min⁻¹ rotor speed, with stability time recorded to torque onset and colour hold measured by oven ageing at 195 °C, is used to compare stabiliser performance. Process failures observed on production lines include dark stripe formation behind the screw flight tips, localised degradation at the die land, and cyclic yellow-pink banding when melt temperature oscillates more than ±5 °C around the setpoint. Adherence to a melt pressure fluctuation envelope of ±1.0 MPa and die head temperature uniformity of ±2 °C generally preserves early colour, but published data for a specific commercial grade from the Zhejiang ZPC Sales Co., Ltd. range in any particular extruder configuration remains limited.In calendered transparent film production, liquid calcium-zinc stabiliser packages are selected against migration, organoleptic, and fogging criteria rather than maximum heat stability alone. A plasticised PVC film compound typically contains general-purpose phthalate or terephthalate plasticiser at 30–50 phr, liquid calcium-zinc stabiliser at 1.0–2.5 phr, epoxidised soybean oil at 3–8 phr as a hydrochloric acid scavenger, and an organophosphite co-stabiliser at 0.3–1.0 phr. Four-roll L-type calenders are operated with roll surface temperatures between 170 °C and 185 °C, nip gaps from 0.2 mm to 0.5 mm, and friction ratios between adjacent rolls of 1.05:1 and 1.15:1 to maintain bank rotation and surface gloss. Plate-out on the third and fourth rolls is a common production failure when the zinc carboxylate content is too high or when the ESBO level is insufficient, because zinc chloride formed by the stabilisation reaction accumulates at the roll surface and encourages polymer adhesion. Fogging measurements per DIN 75201 are applied when the film is intended for automotive interior laminates, and thermal stability is evaluated by ISO 182-2 pH change after heat exposure. Moisture absorption in the stabiliser package at relative humidity above 60% requires pre-drying because free moisture increases ester hydrolysis and roll deposit formation. Calcium-zinc systems have a narrower early-colour window than barium-zinc systems; incremental zinc loading beyond the stoichiometric demand can produce sudden blackening during calendering, which is not reversible by raising the calcium soap concentration. Published data for the exact roll shear rates associated with commercial Zhejiang ZPC Sales Co., Ltd. grades in this film thickness range is limited.Liquid mixed-metal stabilisers function by combining a zinc carboxylate, which rapidly substitutes labile allylic chlorine atoms, with a barium or calcium carboxylate, which regenerates the zinc soap and inhibits the accumulation of zinc chloride. Zinc chloride is a strong Lewis acid and, when present in excess, catalyses rapid unzipping of the PVC chain, resulting in the abrupt blackening known as zinc burning. The calcium-zinc route requires co-stabiliser ratios that maintain a zinc-to-calcium balance in the compound; typical addition levels include epoxidised soybean oil at 3–8 phr, an organophosphite at 0.3–1.0 phr, and a beta-diketone at 0.1–0.5 phr. Liquid barium-zinc stabilisers generally provide better long-term colour hold but are constrained in potable water and food-contact applications by heavy-metal migration restrictions. Solid calcium-zinc packages containing hydrotalcite at 0.5–1.5 phr are used where moisture uptake during storage must be controlled below 0.5 wt%. Dynamic colour hold is measured by oven ageing at 185 °C with 15-minute intervals using ISO 182-2 or ISO 182-1 Congo red protocols. The following table summarises the comparative loading ranges, process windows, co-stabiliser systems, and dominant failure modes for the four stabiliser classes distributed by Zhejiang ZPC Sales Co., Ltd.; the values are representative industry ranges, not product-specific specifications.Stabiliser classTypical loading range (phr)Melt temperature window (°C)Co-stabiliser systemDominant failure modeMethyltin mercaptide0.4–2.0180–205Paraffin wax, oxidised PE waxLong-term yellowing, plate-outLiquid barium-zinc1.5–3.0170–190ESBO, phosphiteZinc burning, exudationLiquid calcium-zinc1.5–3.5165–185ESBO, beta-diketoneEarly yellowing, moisture sensitivitySolid calcium-zinc2.0–4.0170–195Hydrotalcite, phosphiteRough surface, shear heatingWhen injection-moulded rigid PVC fittings are produced in multi-cavity tools with hot-tip gating, the stabiliser system experiences shear rates substantially higher than those in pipe extrusion. A rigid fitting compound containing methyltin mercaptide at 1.0–2.0 phr is usually combined with a core-shell impact modifier such as MBS or ABS at 3–10 phr, an acrylic processing aid at 1–3 phr, and a fatty acid ester lubricant at 0.3–1.0 phr. Melt temperatures are held between 195 °C and 210 °C, while clamp force settings for four- to sixteen-cavity tools generally range from 1000 kN to 4000 kN depending on projected area. Gate shear rates in the range of 10³ s⁻¹ to 10⁵ s⁻¹ generate local viscous heating; therefore the stabiliser must suppress shear-induced dehydrochlorination while maintaining sufficient lubricity to prevent jetting and short shots. Spiral flow testing at 200 °C with a wall thickness of 2 mm is used for lot-to-lot stabiliser comparison, and notched impact strength is checked according to ISO 179. Process failures observed on production lines include pink discolouration near the gate, surface splay at the weld lines, and intermittent colour variation caused by melt residence time exceeding 15 minutes above 200 °C. Avoid combining organotin mercaptide stabilisers with amine-based additives because the interaction produces premature discolouration. Published data for the exact gate geometry and stabiliser response from the Zhejiang ZPC Sales Co., Ltd. range in this specific fitting configuration is limited.A plastisol dip-moulding operation using PVC paste resin, primary plasticiser at 60–100 phr, and liquid calcium-zinc stabiliser at 1.5–3.0 phr is controlled primarily by the rate of viscosity increase during bath ageing. Initial Brookfield RV viscosity, measured at 25 °C with spindle 4 at 20 min⁻¹, typically falls between 1500 mPa·s and 3000 mPa·s for general-purpose dip moulding. Viscosity after 24 hours should not increase by more than 20%, because higher increases produce uneven pick-up, drips, and wall-thickness variation. Hot dipping and cure are performed at 180–200 °C for 3–8 minutes depending on thickness, with final wall thickness from 0.5 mm to 3.0 mm. Heat stability is evaluated by ISO 182-1 Congo red at 200 °C; a stability time of at least 60 minutes is needed for multiple immersion cycles without batch replacement. Fogging tests per DIN 75201 are specified for automotive interior parts, and migration testing follows EU 10/2011 where the plastisol contacts food. The stabiliser package must remain compatible with antistatic and antimicrobial additives in the plastisol, but published data for the specific interaction between Zhejiang ZPC Sales Co., Ltd. liquid calcium-zinc grades and antimicrobial concentrates in long-dwell dip tanks is limited.Flexible wire and cable insulation compounds require stabiliser loadings that are bounded by long-term heat resistance and volume resistivity rather than short-term colour hold alone. A plasticised PVC insulation compound may contain linear phthalate or trimellitate plasticiser at 40–80 phr, liquid barium-zinc stabiliser at 2.0–4.0 phr, epoxidised soybean oil at 5–10 phr, and calcined clay or precipitated silica filler at 5–15 phr. Extended thermal ageing is evaluated by ISO 188 or IEC 60216 protocol at 100 °C and 135 °C service-temperature classes, with elongation retention measured according to ASTM D638-14. Volume resistivity is determined by IEC 60093; ionic residues from stabiliser decomposition must not reduce dry insulation resistance below typical minimum values of 10¹² Ω·cm at 20 °C. Excessive stabiliser loading may exude to the conductor or insulation surface, causing loss of adhesion and increased dissipation factor. A production-scale failure typical of high-temperature PVC wire lines is the formation of copper mirror corrosion at the conductor interface, which is monitored by colourimetric copper contact tests after heat ageing. The lower process temperature of wire extrusion, typically 165–185 °C at the die, means that stabiliser activation must be sufficient early in the screw but not so aggressive that fused deposits form in the breaker plate. Published data for specific Zhejiang ZPC Sales Co., Ltd. mixed-metal grades at the upper service temperature range is limited to application-specific customer evaluations.During weatherable window profile extrusion, stabiliser selection is coupled to titanium dioxide photochemistry, impact modifier concentration, and die pressure fluctuations across internal web cross-sections. Rigid PVC-U profile formulations for exterior building profiles typically use solid calcium-zinc stabiliser at 3–5 phr or an organotin mercaptide at 1.0–2.0 phr, chlorinated polyethylene or acrylic impact modifier at 6–10 phr, rutile titanium dioxide at 8–12 phr, and a lubricant package that balances external compatibility with internal shear heating. Extrusion is performed on parallel counter-rotating twin-screw extruders with length-to-diameter ratio of 25:1 to 30:1, barrel temperatures from 160 °C to 180 °C, and die melt temperature between 180 °C and 195 °C. The stabiliser must protect the melt during the long residence time in the calibration and cooling tank; edge stress after calibration can exceed 0.5 MPa in profiles with complicated internal webs. Accelerated weathering is evaluated by ASTM G155 xenon arc exposure with colour change assessed by ISO 105-A02, while impact retention after weathering is checked by ISO 179. A production-scale failure involving surface chalking and embrittlement occurs when the stabiliser system is underloaded relative to the TiO₂ photocatalytic activity, especially in high-aspect-ratio glazing beads. Published data for the weathering performance of specific Zhejiang ZPC Sales Co., Ltd. grades in compounds with varying TiO₂ surface treatments is limited.Foamed PVC sheet extrusion imposes a simultaneous demand between the decomposition of azodicarbonamide blowing agent and the stabiliser-controlled dehydrochlorination of the PVC matrix. A free-foamed rigid PVC sheet compound typically contains suspension PVC, organotin mercaptide or calcium-zinc stabiliser at 0.8–2.5 phr, azodicarbonamide at 0.3–1.0 phr, acrylic processing aid at 5–10 phr, and calcium carbonate at 0–5 phr. The extruder, usually a parallel or conical twin-screw machine with length-to-diameter ratio between 30:1 and 36:1, is operated with barrel temperatures of 165–185 °C and a die temperature of 170–185 °C. The blowing agent decomposition onset is near 200 °C, but the presence of zinc compounds can reduce the decomposition exotherm and narrow the foaming window by 5–10 °C. Stabiliser choice directly influences cell structure because premature HCl evolution accelerates polymer chain scission and reduces melt strength, producing gross-void coalescence and density variation. Density is measured according to ASTM D792 or ASTM D1622, with typical free-foamed sheet densities of 0.45–0.80 g/cm³. Cell size distribution is inspected by ASTM D3576 microscopy. Production failures include pinholes along the sheet edges, blown surface cells, and periodic density banding when the melt temperature oscillates more than ±5 °C. Published data for the gas-yield interaction between specific Zhejiang ZPC Sales Co., Ltd. stabiliser grades and exothermic blowing agent masterbatches in this process is limited; process validation is therefore batch-specific.

Within the coastal refining and petrochemical corridor at Ningbo, Ningbo Zhongjin Petrochemical Co., Ltd. occupies an operational envelope in which marine-terminal feedstock logistics, electrostatic desalting, naphtha hydrotreating, catalytic reforming, and aromatic fractionation are subject to combined constraints imposed by national petrochemical layout policy and by the material limits of Cr-Mo low-alloy steel process equipment. Published mechanical-flow diagrams and stream-specific compositional data for this specific configuration are limited; therefore the following operational tolerances are drawn from comparable coastal naphtha hydrotreaters, continuous catalyst regeneration reformers, and extractive distillation units described in licensor technical bulletins and in standards such as API RP 932-B, ISO 3405:2019, GB 31571-2015, and ASTM D3230-19. Crude and condensate receipts for such sites are typically discharged from 50 000–150 000 deadweight tonne marine vessels into floating-roof storage tanks, where water and sediment are first allowed to settle under quiescent conditions at 45–65 °C before transfer to a two-stage horizontal electrostatic desalter. Desalter operation in comparable units is controlled within a mixing differential pressure of 0.03–0.10 MPa, a wash-water ratio of 4–8 vol%, a grid voltage of 15–35 kV, and a residence time of 20–40 min; these parameters maintain crude salt content below 3 mg/L as measured by ASTM D3230-19 and reduce brine carryover into downstream units. Emulsion-breaking chemicals are injected at 5–30 mg/kg at the crude transfer line, with selection dependent on asphaltene stability and naphthenic acid salt dispersibility. Inadequate desalter control leads to chloride ingress into the naphtha hydrotreater, where hydrolyzable chlorides convert to hydrogen chloride in the reactor effluent and subsequently deposit ammonium chloride at temperatures between 145 °C and 230 °C in the reactor effluent air cooler, as characterized by API RP 932-B; the resulting under-deposit corrosion can reduce air-cooler tube wall thickness at rates exceeding 0.25 mm/year if water dew point control is lost. This chloride pathway establishes the first process conflict: maximizing desalter brine removal without destabilizing asphaltenes through excessive electrostatic field strength or low pH.  When cracked naphtha is blended into the hydrotreater feed at concentrations above 10–20 wt%, the fixed-bed Co-Mo/Al₂O₃ catalyst experiences accelerated deactivation from diolefin polymerization and silicon deposition, while the reactor pressure drop increases due to gum formation in preheat exchangers. In comparable downflow naphtha hydrotreaters, catalyst bed life is typically governed by the ratio of straight-run naphtha to cracked stock, the total diolefin content measured by UOP 326-17, and the silicon content determined by ASTM D5184-12 after acid digestion. Reactor inlet temperatures are maintained between 260 °C and 340 °C, with start-of-run temperatures near the lower bound and end-of-run temperatures approaching 370 °C as the weighted average bed temperature increases to compensate for catalyst activity loss. Hydrogen partial pressure is held between 1.5 MPa and 4.0 MPa, while the hydrogen-to-hydrocarbon molar ratio is controlled at 2:1 to 5:1 to suppress coke precursors. Liquid hourly space velocity is typically specified at 1.0–4.0 h⁻¹, and the combined feed is brought to reaction temperature through a feed-effluent heat exchanger train fabricated from stabilized austenitic stainless steel to resist chloride stress-corrosion cracking. Sulfur in the desulfurized naphtha is measured by ASTM D5453-19e1 and is normally reduced to below 0.5 mg/kg before catalytic reforming, while nitrogen is measured by ASTM D5762-18 and limited to below 0.1 mg/kg because organic nitrogen compounds neutralize the acidic chloride function of the reforming catalyst. The hydrotreater effluent is routed through a high-pressure separator, where sour water containing ammonium bisulfide is drawn off at 30–50 °C and sent to sour water stripping. The recycle gas compressor, typically a centrifugal machine with dry gas seals, returns hydrogen-rich gas to the reactor at a pressure drop of 0.2–0.5 MPa across the loop. The dominant process conflict in this unit arises when the cracked naphtha addition increases the reactor pressure drop above 0.35 MPa before the scheduled catalyst change-out, necessitating a reduction in feed rate or an increase in hot hydrogen stripping temperature. Published data for the specific cracked-naphtha blend ratio and catalyst cycle length at Ningbo Zhongjin Petrochemical Co., Ltd. is limited, but licensor reference cases for similar coastal naphtha hydrotreaters indicate that cycle lengths between 24 months and 48 months are achievable only when diolefin content is controlled by selective hydrogenation upstream.       Standard codeMeasured propertyInstrumentationTypical applicability boundaryASTM D3230-19Crude salt contentelectrometric analyser<3 mg/L after two-stage desalterASTM D5453-19e1Total sulfur in naphthaultraviolet fluorescence detector<0.5 mg/kg for reforming feedASTM D5762-18Total nitrogen in naphthaboat-inlet chemiluminescence<0.1 mg/kg for reforming feedASTM D4177-20Representative samplingautomatic flow-proportional samplersample loop velocity 1–2 m/sISO 3675:1998Density of crude and liquid productsglass hydrometer0.650–0.850 g/cm³ at 15 °C for light naphtha The catalytic naphtha reformer at a coastal site such as Ningbo Zhongjin Petrochemical Co., Ltd. is subject to a chloride management dichotomy: sufficient organic chloride must be injected to maintain the acidic function of the Pt-Sn/Al₂O₃ catalyst, while excess chloride hydrolyzes to hydrogen chloride and attacks the cooler and separator metallurgy downstream. In continuous catalyst regeneration reformers, catalyst is circulated from radial-flow reactors through a regeneration tower, where coke is combusted at controlled oxygen concentration and the catalyst is subsequently oxychlorinated at 510–530 °C to redisperse platinum. Reactor inlet temperatures are typically controlled at 480–540 °C, with high-severity operation for aromatics production approaching 545 °C; reactor pressure is held between 0.35 MPa and 1.0 MPa to favor dehydrogenation and dehydrocyclization. The hydrogen-to-hydrocarbon molar ratio is maintained between 2 mol/mol and 5 mol/mol, and liquid hourly space velocity is set at 1.0–1.5 h⁻¹ to preserve catalyst activity over cycles of 6–12 months in semi-regenerative configurations or near-continuous operation with moving-bed regeneration. Chloride is injected as perchloroethylene or a proprietary chloriding agent at a rate adjusted to maintain a target chloride equilibrium of 0.9–1.1 wt% on catalyst; water injection is simultaneously controlled to keep the chloride-to-water molar ratio within the range defined by the catalyst manufacturer, because excess water strips chloride and excess chloride leads to condensation of hydrochloric acid at the product separator. Reactor internal parts are fabricated from stabilized austenitic stainless steel such as Type 321 or Type 347, while the fired heater tubes are made from 9Cr-1Mo or 9Cr-1Mo-V alloy steel capable of withstanding 550–600 °C tube metal temperatures. Reformate research octane number is measured by ASTM D2699-23 and motor octane number by ASTM D2700-23; total aromatics are measured by ASTM D5580-21 gas chromatography. The process conflict at this stage is the trade-off between high reformer severity for benzene-toluene-xylene production and the increasing cracking to fuel gas, which raises the wet gas compressor load and reduces liquid yield. Published data for the specific reformer configuration and severity at Ningbo Zhongjin Petrochemical Co., Ltd. is limited, but the chloride and water balance constraints described above are common to all chlorided alumina reformers operating on desulfurized naphtha with sulfur below 0.5 mg/kg.  When dissolved oxygen enters the aromatic extraction solvent loop at a concentration exceeding 0.5–1.0 mg/kg through pump seal leaks, open solvent sumps, or nitrogen-blanket interruptions, the sulfolane or tetraethylene glycol solvent undergoes oxidative and acid-catalyzed degradation to form sulfolene, organic acids, and high-boiling polymeric residues. In comparable aromatic extraction units processing reformate or pyrolysis gasoline, the extraction column is operated at a solvent-to-feed mass ratio of 3:1 to 5:1 and at a bottom temperature of 50–80 °C; the aromatic-rich extract is then recovered in a solvent-recovery column under vacuum at 120–160 °C and 20–40 kPa absolute pressure. Solvent degradation is controlled by maintaining a nitrogen blanket of 0.5–2.0 kPa gauge on all solvent accumulators, by limiting oxygen ingress to below 0.1 mg/kg with nitrogen stripping, and by maintaining the solvent pH between 5.5 and 7.0 as measured by ASTM E70-19. Solvent purity is monitored by gas chromatography using ASTM D7504-20, with sulfolane purity normally above 98 wt% and total acid number below 0.5 mg KOH/g. The extraction column may be a rotating disc contactor or a structured packed column, with the internals fabricated from carbon steel or stainless steel depending on solvent acidity. If oxygen ingress is not corrected, the degradation products accelerate fouling in the solvent reboiler and increase the solvent viscosity, which reduces extraction efficiency and raises the reboiler steam consumption. The operational boundary for continuous operation is therefore defined by the oxygen exclusion limit, the solvent circulation rate, and the water content of the solvent; sulfolane extraction units typically tolerate water contents up to 1.0–1.5 wt% before selectivity loss requires vacuum dehydration. Published data for the specific solvent loop configuration at Ningbo Zhongjin Petrochemical Co., Ltd. is limited, but the oxygen-exclusion requirement and the solvent pH window are common to all industrial sulfolane-based aromatic extraction systems. Tank farm and vapour recovery operations at the Ningbo Zhongjin site are constrained by floating-roof seal compatibility, nitrogen supply under low-flow conditions, and vapor-pressure limits derived from GB 31571-2015 and API 2000. Storage tanks containing light naphtha, reformate, benzene, and toluene are designed as internal floating-roof or fixed-roof tanks with low-pressure vents, depending on the true vapor pressure of the stored liquid at 50 °C; when the true vapor pressure exceeds 14 kPa, emission controls such as vapour recovery or thermal oxidation are required. Tank vents are connected to a vapour recovery unit equipped with activated carbon adsorption or lean oil absorption, and the treated vent gas is sampled according to ASTM D5466-21 for sulfur compounds and ASTM D5953M-23 for odorants. Nitrogen supply is sized to maintain a positive pad pressure of 0.2–1.0 kPa gauge under maximum tank breathing demand calculated from API 2000, while low-pressure relief devices are set at 2.0 kPa gauge to avoid structural deformation. Loading operations for tank trucks and rail cars use bottom loading with vapour return, and the loading arms are fitted with dry-break couplings and overfill protection set at 90% of nominal capacity. The wastewater treatment system receives desalter brine, sour water stripper bottoms, and oily water from the process area; primary oil–water separation uses corrugated plate interceptors and dissolved air flotation units, with oil and grease measured by ASTM D7066-20 before discharge to the secondary biological treatment stage. The segregated sour water stream is then released to a wet air oxidation unit only after oil and grease content is verified by ASTM D7066-20 to be below 10 mg/L and after sulfide content measured by ASTM D4658-15 is below 0.5 mg/L.       Control parameterEquipmentSet point or boundaryReference methodReformer reactor inlet temperatureCCR radial-flow reactor480–540 °Cthermocouple Type K, IEC 60584-1Desalter mixing differential pressureglobe control valve on crude/water mix0.03–0.10 MPadifferential pressure transmitterWater wash ratioelectrostatic desalter4–8 vol%flow totalizersREAC inlet water dew point marginreactor effluent air cooler≥5 °C above calculated water dew pointelectrolytic resistance probeSulfolane solvent pHaromatic extraction solvent loop5.5–7.0ASTM E70-19

On July 28 (Beijing Time), the 2026 *Fortune* Global 500 list was released. Zhejiang Rongsheng Holding Group ranked 115th with an annual revenue of $94,831.1 million (approximately 681.6 billion RMB)—an improvement of three spots from the previous year. The *Fortune* Global 500, published annually, uses corporate annual revenue as its primary selection criterion and serves as one of the most credible benchmarks for the overall strength of large global corporations. Since its debut on the list in 2021, Rongsheng Holding Group has been featured for six consecutive years. Its ranking has climbed steadily from an initial 255th place to 115th, further solidifying its standing within the global petrochemical industry. This year, the combined revenue of all companies on the *Fortune* Global 500 list reached approximately $43.1 trillion—exceeding one-third of the global GDP—representing a year-on-year increase of about 3.2%. The threshold for inclusion (minimum annual revenue) rose from $32.2 billion last year to $33.2 billion. The total net profit for all listed companies reached approximately $3.4 trillion, an increase of about 14% year-on-year. A total of 122 Chinese companies (including those from the Taiwan region) made the list; Rongsheng Holding Group ranked 33rd among these Chinese firms, maintaining the same position as last year. Looking ahead, Rongsheng Holding Group remains committed to aligning with national strategic priorities. The company will drive high-quality development through technological innovation and global collaboration, with a focus on cultivating "new quality productive forces." By advancing the high-end, intelligent, and green transformation of its industrial chain, Rongsheng aims to further consolidate its position as a global leader in the chemical industry, contributing its strength toward elevating China’s petrochemical sector within the global value chain.

On April 8, Brand Finance, a globally recognized authority on brand valuation, released its "2026 Ranking of the World’s Most Valuable Chemical Brands." The list features BASF, SABIC, Dow, Linde, and Rongsheng Petrochemical. Leveraging its robust brand resilience and global influence, Rongsheng Petrochemical has once again secured the fifth position globally. Its brand value grew by 2.3% year-on-year to $3.3 billion, making it the only Chinese brand among the top five. This marks the seventh consecutive year that Rongsheng Petrochemical has appeared on this list. Since its debut in 2020, the company has consistently led among global chemical brands, establishing itself as one of the most stable and steadily growing brands in the industry. This achievement underscores the company’s operational resilience within a complex and volatile global market, as well as its growing influence and stature within the global petrochemical supply chain. Behind these impressive results lies Rongsheng Petrochemical’s solid industrial foundation. As a world-leading producer of chemical materials, the company operates a 40-million-ton-per-year green petrochemical complex—the largest single-site integrated refining and chemical project in the world—with a total chemical production capacity of nearly 60 million tons. It is a major producer in China and across Asia for polyester, new energy materials, engineering plastics, and high-value-added polyolefins. Furthermore, it ranks as the world’s largest producer of chemicals such as PX and PTA, and holds a top-tier global position in the production of polyethylene, polypropylene, PET, EVA, ABS, and PC. Beyond its formidable industrial capabilities, technological innovation and digital transformation serve as the core engines driving the continuous growth of Rongsheng Petrochemical’s brand value. By deeply integrating AI, the company has achieved intelligent sensing, dynamic optimization, and autonomous decision-making across its entire production process. This has not only enhanced the stability and safety of its facilities but has also yielded significant gains in quality improvement, efficiency, process optimization, and green, low-carbon operations. In the realm of ESG (Environmental, Social, and Governance), Rongsheng Petrochemical’s outstanding performance has further infused its brand value with a commitment to sustainability. In 2025, the company’s MSCI ESG rating climbed from BBB to A—its best-ever performance—placing it among the top-rated chemical enterprises in China. The company’s performance across areas such as carbon emission reduction, water resource management, and corporate governance consistently surpassed the global industry average, earning broad recognition from stakeholders worldwide and successfully establishing an international brand image rooted in green, low-carbon principles. Looking ahead, Rongsheng Petrochemical will leverage "new quality productive forces" to drive brand upgrading, deepen global strategic partnerships, accelerate digital transformation, and focus on the R&D and innovation of high-end chemical new materials. By steadfastly upholding its ESG commitments, the company aims to further solidify its leadership in the global chemical industry and contribute to the high-quality, sustainable development of the global petrochemical sector.

On July 16, Rongsheng Petrochemical announced that it has signed a Project Development Agreement (PDA) with Saudi Basic Industries Corporation (SABIC) and Rongsheng New Materials (Zhoushan) Co., Ltd. (a wholly-owned subsidiary of Rongsheng Petrochemical) to jointly advance the development of the Jintang New Materials Project, located in Zhoushan, Zhejiang Province, China. Under the PDA, Rongsheng Petrochemical and SABIC are evaluating a potential equity investment by SABIC in Rongsheng New Materials, ranging from 30% up to 50%. This could transform the project into a strategic partnership between two global leaders in the petrochemical industry. The agreement also establishes a framework for cooperation during subsequent project development phases and lays the groundwork for both parties to move toward a potential Final Investment Decision (FID). Mr. Xiang Jiongjiong, General Manager of Rongsheng Petrochemical, stated: "This partnership marks a significant milestone for both Rongsheng Petrochemical and SABIC, and it has the potential to become a model for mutually beneficial collaboration. By leveraging the respective strengths and robust capabilities of both industry leaders, we aim to jointly develop advanced chemical materials and collaborate on operations. In today’s complex and volatile market environment, this partnership will serve as a stabilizing force for the chemical industry, enabling us to deliver higher-value, comprehensive product solutions to our customers." Dr. Faisal M. Alfaqeer, CEO and Executive Board Member of SABIC, remarked: "This collaboration with Rongsheng Petrochemical reflects SABIC’s vision to drive business growth and expand our global footprint through strategic alliances. SABIC remains committed to innovation, the upgrading of our product portfolio, and the creation of sustainable value, all while continuously enhancing our ability to serve customers worldwide. We look forward to working closely with Rongsheng Petrochemical, combining our respective strengths, capabilities, and expertise to evaluate and advance this opportunity." The Jintang New Materials Project is designed to increase production capacity for advanced chemical materials, supporting the growing market demand from key downstream industries in China and across Asia. The project is expected to leverage world-class technology, integrated manufacturing capabilities, and operational excellence to further enhance competitiveness, stimulate innovation, and create long-term value for all stakeholders. About SABIC:SABIC (Saudi Basic Industries Corporation) is a globally renowned diversified chemicals company headquartered in Riyadh, Saudi Arabia. It operates world-class manufacturing facilities across the Americas, Europe, the Middle East, and the Asia-Pacific region, with a product portfolio spanning chemicals, commodity and high-performance plastics, and agri-nutrients. SABIC is committed to helping its customers identify and capture opportunities in key end-use sectors, including automotive, healthcare, electrical and electronics, packaging, agriculture, consumer goods, and construction.With a global workforce of over 26,000 employees, SABIC serves customers in more than 140 countries and regions. Driven by a spirit of innovation and ingenuity, the company holds over 10,700 patents and operates multiple technology and innovation centers worldwide. About Rongsheng Petrochemical:Rongsheng Petrochemical is a leading global chemical materials enterprise. It operates a diverse portfolio of chemical projects—including one of the world’s largest integrated refining and petrochemical complexes—with a total chemical production capacity exceeding 60 million tons. The company is a major global producer of polyesters, engineering plastics, polyolefins, rubber, and new energy materials. It ranks first globally in the production capacity of PX and PTA, and maintains a top-tier global position in the production of core products such as PE, PP, PET, EVA, ABS, PC, and rubber.Rongsheng Petrochemical continues to deepen its global industrial footprint. Thanks to its comprehensive industrial chain and competitive global advantages, the company earned several prestigious industry rankings in 2025: 5th place among the world’s most valuable chemical brands, 7th place in the global chemical industry’s "Billion-Dollar Club," and 9th place among the top 100 global chemical companies.

Recently, the Jintang New Materials Project—a venture under Rongsheng Petrochemical—achieved a major technical breakthrough. According to a report by CCTV News, a critical supporting component of the project—a cross-sea petrochemical pipe rack—was successfully installed in Zhoushan, Zhejiang. This operation marked the first time in China that a large-span, high-tonnage structure has been precisely hoisted and positioned at such a height over the sea. The individual module hoisted in this operation weighed 515 tons and measured 43 meters in length, setting a new national record for this type of construction and filling a technical gap in the installation of high-tonnage, offshore pipe racks. Often described as the "aerial artery" of a petrochemical complex, the pipe rack serves as the vital link between raw materials and production processes. The construction site—located high above the sea—presented extreme challenges, including soft, unstable tidal flat soil and constant interference from sea winds, which demanded an exceptionally high degree of precision. To navigate these complex conditions, the Rongsheng Petrochemical project team employed an innovative, integrated construction approach combining "transportation, hoisting, and sliding." For the lifting phase, the team utilized a 1,600-ton class crawler crane paired with a proprietary, self-developed 600-ton specialized frame-type balance beam. This solution effectively addressed common industry challenges—such as the tendency for large-span, heavy-load modules to deform or lose stability—enabling "millimeter-level" precision during high-altitude positioning. As a key strategic move to extend Rongsheng Petrochemical’s industrial chain, the Jintang New Materials Project involves a total investment of approximately 67.5 billion yuan. It includes plans for 27 major production units and 16 supporting utility facilities. Once fully operational, the project is expected to generate an annual output value of 91.7 billion yuan, focusing on the development of new material supply chains, including high-performance resins, biodegradable plastics, specialty polyesters, and high-end fibers. The successful installation of this cross-sea pipe rack not only signifies that the project has cleared a major technical hurdle, but also demonstrates Rongsheng Petrochemical’s leading capabilities in the construction of ultra-large-scale petrochemical infrastructure, laying a solid foundation for the project’s high-quality commissioning.

Recently, the Department of Economy and Information Technology of Zhejiang Province announced the list of provincial-level "Smart Factories" for 2025. The smart factory for new-type and differentiated polyester fibers, operated by Shengyuan Chemical Fiber—a subsidiary of Rongsheng Petrochemical Co., Ltd.—has been successfully selected. This achievement follows Shengyuan Chemical Fiber’s recognition in 2023 for an "Excellent Scenario for Intelligent Manufacturing" at the national level, marking another significant milestone for the company in the field of intelligent manufacturing. The smart factory has established a comprehensive system for intelligent production and data-driven decision-making, covering everything from raw materials to finished products, and from production execution to business management. It achieves full-chain digital and intelligent operations, demonstrating exceptional system integration and collaborative capabilities. This recognition also marks a critical step for Rongsheng Petrochemical in establishing an intelligent manufacturing layout across its entire petrochemical value chain. Previously, Zhejiang Petrochemical—a flagship integrated refining and chemical enterprise under Rongsheng Petrochemical—was designated as a provincial-level "Advanced Smart Factory." The inclusion of Shengyuan Chemical Fiber further solidifies a complete, closed-loop intelligent manufacturing ecosystem, spanning from upstream refining and chemical production to downstream chemical fiber manufacturing. Looking ahead, Rongsheng Petrochemical intends to further deepen the integration and innovation of new-generation information technology within its physical manufacturing operations. The company plans to increase R&D investment, expand the scope of digital applications, explore more advanced intelligent manufacturing models, and leverage its position as an industry leader to drive the collaborative upgrading of the entire value chain—ultimately contributing to the strengthening and enhancement of the global competitiveness of my country’s petrochemical industry.

Recently, the internationally renowned index provider MSCI released its latest ESG (Environmental, Social, and Governance) ratings. Thanks to its sustained commitment and outstanding achievements in the realm of sustainability, Rongsheng Petrochemical has seen its MSCI ESG rating climb from BBB to A—the highest rating ever achieved by the company, and currently the highest MSCI ESG rating held by any Chinese chemical enterprise. The company’s scores across all three core dimensions—Environmental, Social, and Governance—have shown steady improvement, placing it among the top performers in the global diversified chemicals industry and at the forefront of global petrochemical companies. The MSCI ESG rating is one of the most influential sustainability assessment systems in the international capital market, serving as a key reference for institutional investors worldwide when making investment decisions. This upgrade is a significant milestone, reflecting Rongsheng Petrochemical’s long-term dedication to ESG management and its active pursuit of sustainable development. It signifies that the company’s comprehensive performance in the environmental, social, and governance spheres has reached a leading global standard within its sector, while also underscoring the international capital market’s strong recognition of the company’s sustainability capabilities and long-term investment value. As a petrochemical enterprise designated as a benchmark for green development in China, Rongsheng Petrochemical has spent the past year driving industrial upgrading through technological innovation and fostering high-quality development via clean, low-carbon practices. Regarding greenhouse gas (GHG) emissions, the company achieved a 10% reduction in GHG emission intensity and a 12.5% ​​reduction in comprehensive energy consumption intensity in 2024. Notably, leveraging its 40-million-ton-per-annum integrated refining and chemical project—the largest single-site facility of its kind globally—the company has implemented a 240,000-ton-per-annum food-grade liquid carbon dioxide recovery unit. This initiative not only ensures "ultra-clean" pollutant emissions but also transforms waste into a valuable resource, creating synergistic benefits—saving energy, reducing pollution and carbon emissions, and enabling the high-value utilization of CO2—thereby consistently converting environmental benefits into economic gains. In terms of clean energy adoption, subsidiaries such as Yongsheng Technology, Shengyuan Chemical Fiber, and Zhongjin Petrochemical have successfully implemented photovoltaic power generation projects, injecting "green momentum" into their production and operations. In terms of water resource management, alternative water sources accounted for 73.66% of the company’s total water consumption in 2024, with a water recycling rate reaching 98%. Furthermore, over 70 million tons of fresh water were produced using waste heat. Several key products from Zhejiang Petrochemical—a subsidiary—consistently lead the nation in energy and water efficiency, establishing the company as a benchmark within the petrochemical industry. For a long time, Rongsheng Petrochemical has actively fulfilled its social responsibilities, aligning its own development with national strategies. The company has supported poverty alleviation and rural revitalization initiatives, demonstrating its core commitment: "derived from society, giving back to society." Placing a high priority on chemical safety management, the company continuously elevates product safety standards to safeguard the health and well-being of its employees, customers, and the surrounding communities. Guided by a people-centric philosophy and a commitment to mutually beneficial cooperation, the company actively addresses the needs of both internal and external stakeholders, working alongside them to foster shared development. Regarding corporate governance, the company has consistently refined its governance structure, enhanced transparency, promoted board diversity and independence, and cultivated a more robust governance ecosystem. Simultaneously, it has optimized internal management systems and upheld high standards of business ethics, ensuring full legal and regulatory compliance. Through these rigorous standards and concrete actions, the company promotes the synergistic development of the enterprise, the environment, and society. As a global benchmark for sustainability in the petrochemical industry, Rongsheng Petrochemical remains dedicated to its sustainable development philosophy. The company continues to strengthen its ESG management, actively fulfill its social responsibilities, and drive harmonious, mutually beneficial growth for both the enterprise and society—advancing with firm resolve toward a greener, low-carbon, and sustainable future!

On the afternoon of August 22, a signing ceremony for a strategic partnership between Rongsheng Holding Group and Zhejiang University was held at the Group’s headquarters. This marks the beginning of a new chapter in university-enterprise collaboration, elevating the partnership between a prestigious university and a leading enterprise to a higher level. Ren Shaobo, Party Secretary of Zhejiang University, and Li Shuirong, Chairman of Rongsheng Holding Group, attended the ceremony and delivered speeches. Also in attendance were Jin Deshui, former Party Secretary of Zhejiang University, and Zhou Tufa, Deputy Director of the Department of Science and Technology of Zhejiang Province. The agreement was signed by Xiang Jiongjiong, Vice Chairman of Rongsheng Holding Group, and Huang Xianhai, Vice President of Zhejiang University. Wang Jingdai, Vice President of Zhejiang University, presided over the ceremony. Ren Shaobo noted that Zhejiang University and Rongsheng share a deep-rooted connection and a history of close cooperation. In recent years, the two sides have strengthened strategic mutual trust and expanded the scope of their collaboration, with outstanding graduates from the university becoming a vital force within the Rongsheng Group. Against the backdrop of global industrial upgrading and the transition toward a green economy, this strategic partnership will be guided by major strategic objectives. The collaboration will focus on the forward-looking deployment of strategic and foundational R&D projects to secure a leading position in future technological innovation and serve as a new regional growth engine. Supported by high-level platforms—most notably the "Zhejiang University–Rongsheng China Green Petrochemical Innovation Research Institute"—the partnership aims to foster deep integration between scientific innovation and industrial development, thereby generating new momentum for research. Furthermore, by prioritizing high-level talent, the two sides will intensify efforts in attracting and cultivating top-tier global talent, recruiting outstanding graduates, and providing corporate professional training. By deepening this "talent reservoir," both parties aim to achieve even more fruitful outcomes, providing a powerful impetus for my country’s energy revolution and its advancement toward becoming a global leader in science and technology. Li Shuirong highlighted that Zhejiang University possesses a comprehensive range of academic disciplines and a strong foundation in basic research, while Rongsheng Group boasts a complete petrochemical industrial chain and exceptional capabilities in engineering and industrial application. Over the years, the two sides have collaborated closely on process optimization and talent development, jointly creating various production technologies, training high-caliber professionals, and establishing teaching and internship bases. This signing marks a transition in the partnership—moving beyond a basic university-enterprise collaboration toward a deep, integrated synergy across industry, academia, research, and application. It holds significant strategic importance for innovation-driven development. Moving forward, leveraging Zhejiang Province’s "415X" advanced manufacturing cluster policy, Rongsheng Group will combine Zhejiang University’s strengths in innovation with its own industrial advantages. The goal is to establish a hub for original technologies in the green petrochemical sector and a reservoir for high-end talent, thereby contributing more substantially to Zhejiang’s ambition of becoming a global advanced manufacturing base and supporting the nation in achieving its "dual carbon" (carbon peaking and carbon neutrality) goals. Under the agreement, both parties will fully harness their respective strengths and resources to deepen cooperation in areas such as scientific and technological innovation, the commercialization of research findings, talent cultivation, and think-tank consulting. Together, they aim to build a world-leading platform for scientific and technological innovation, attract and develop a cohort of high-level talent, consistently produce high-impact collaborative outcomes, and jointly drive high-quality development. Prior to the meeting, Ren Shaobo and his delegation toured the exhibition hall of Rongsheng Holding Group. Attendees included Yu Chuankun, Vice President of Rongsheng Holding Group; Liu Minghui, President of Zhejiang Petrochemical; Yang Shengdong, Chairman and Director of the Green Petrochemical Technology Innovation Center; Xue Kuanrong, General Manager and Deputy Director of the Green Petrochemical Technology Innovation Center; as well as various department and faculty heads from Zhejiang University.