Sinopec Yizheng Chemical Fiber Co., Ltd. (hereinafter referred to as Yizheng Chemical Fiber), located in Yizheng, Jiangsu Province, is one of China's key polyester production bases developed under the national Five-Year Plans from the Sixth through the Fifteenth. The company officially became part of Sinopec in 1998 and has since been positioned as a core R&D and manufacturing platform for high-end polyester materials, specialty fibers, and engineering plastics.
With an overall production capacity exceeding 6.5 million tons per year, the company operates eight major business segments, including PTA, polyester chips, specialty fibers, and engineering plastics. Backed by a 1 million-ton/year PTA plant and a 100,000-ton/year BDO production facility, Yizheng Chemical Fiber has established a fully integrated PBT industrial chain, covering upstream raw materials through downstream resin production. This integrated structure ensures stable product quality, reliable supply, and competitive production costs.
Within China's polyester new materials industry, Yizheng Chemical Fiber holds several leading positions. Its polyester staple fiber ranks among the world's largest by production and sales volume, while its film-grade PET chips have been recognized as a National Manufacturing Single Champion Product. The company's PBT resin technology and market share remain among the industry's first tier, making it one of Eastern China's leading suppliers of high-performance engineering plastics.
Yizheng Chemical Fiber was one of the earliest Chinese enterprises to enter the non-fiber polyester market. It operates the world's first commercial PBT production line utilizing the PTA continuous esterification process, which differs significantly from the conventional BDO transesterification route by delivering lower energy consumption and higher product purity.
In 2019, the company's new 60,000-ton/year PBT resin production line was successfully commissioned, bringing the total number of dedicated PBT production lines to three and increasing total annual capacity to 180,000 tons. This expansion raised the company's domestic PBT production share from approximately 9% to 15%.
The three production lines are designed for flexible manufacturing under a "dedicated production line, dedicated product grade, dedicated customer" model, allowing efficient switching between standard grades and high-performance specialty materials to satisfy customized industrial requirements.
The production facilities have also completed comprehensive localization upgrades, with equipment localization exceeding 95% and proprietary process software independently developed by the company. At the same time, Yizheng Chemical Fiber has expanded into high-value polyester materials including PBST biodegradable polyester, high-viscosity specialty PBT, and TPEE thermoplastic polyester elastomers, continuously enriching its advanced polyester portfolio.
Leveraging years of technological innovation, the company's "Key Technologies and Industrialization of PBT and Biodegradable High-Performance Polyesters" project received the Second Prize of the 2025 Jiangsu Provincial Science and Technology Innovation Award, demonstrating official recognition of its technological leadership.
Yizheng Chemical Fiber has established a comprehensive PBT resin product portfolio covering six major application sectors. As thermoplastic polyester engineering plastics, these products generally offer rapid crystallization, excellent melt flowability, superior electrical insulation, outstanding chemical resistance, excellent thermal stability, and dimensional stability.
These general-purpose injection molding grades feature crystallization indices ranging from 0.65 to 1.05 and provide short molding cycles. After glass fiber reinforcement, mechanical strength and heat resistance are significantly improved, making them ideal materials for automotive components and electrical appliances. Low-extractable clean grades such as GX112J and GX121J are suitable for refrigerant-contact applications and environmentally friendly food-contact products.
These grades feature low hydrolysis, low shrinkage formulations with excellent weather resistance and corrosion resistance. Finished products exhibit exceptional dimensional stability and have been widely used in optical fiber cable buffer tubes with comprehensive telecommunications industry certifications.
Designed for excellent spinnability, uniform coloration, low yarn breakage rates, and extended filtration cycles, these grades are suitable for elastic fibers and industrial filtration fabrics.
These high-transparency, high-purity grades offer excellent compatibility with multilayer co-extrusion processes, producing films with uniform gloss for optical films and multilayer packaging films.
These products provide outstanding thermal stability, excellent pigment dispersion, and superior anti-migration performance, making them ideal carrier resins for plastic color masterbatch production.
As a lightweight, high-performance engineering plastic, PBT resin from Yizheng Chemical Fiber serves a wide range of industrial applications.
Automotive Industry
Modified PBT is widely used in lamp holders, brake system components, fuel valve bodies, interior structural parts, and new energy vehicle battery housings, delivering lightweight performance, excellent heat resistance, and long-term dimensional stability.
Electrical and Electronics
PBT is commonly applied in IC sockets, electrical switches, terminal blocks, household appliance housings, and high-voltage insulation components, benefiting from its superior dielectric properties and suitability for precision thin-wall injection molding.
Telecommunications
Optical cable buffer tubes and communication module housings utilize specialized PBT grades for their excellent long-term weatherability and aging resistance in outdoor environments.
Textiles and Films
PBT is used in elastic polyester fibers, optical packaging films, and industrial filtration fabrics requiring excellent processing performance and durability.
Chemical Supporting Materials
Applications include plastic color masterbatch carriers, composite base materials for TPEE elastomers, and environmentally friendly, low-extractable medical device components.
Integrated Industrial Chain
With in-house PTA and BDO production, Yizheng Chemical Fiber minimizes dependence on external raw material supply, ensuring stable production and reliable deliveries.
Industry-Leading Production Technology
The company's proprietary PTA continuous esterification technology delivers lower energy consumption and significantly reduced impurity levels compared with conventional production processes.
Comprehensive Product Portfolio
From general injection molding grades to optical cable, fiber spinning, film, food-contact, and clean-grade materials, the company provides complete one-stop solutions for compounders, injection molders, cable manufacturers, and film producers.
State-Owned Enterprise Quality Assurance and Green Development
Supported by Sinopec's comprehensive quality management system, the company continues to develop biodegradable polyester materials while balancing high industrial performance with sustainable manufacturing.
Strategic Geographic Location
Located in Jiangsu within the Yangtze River Delta, Yizheng Chemical Fiber enjoys close proximity to China's major automotive, electronics, and chemical manufacturing clusters, enabling efficient logistics and rapid product delivery.
Driven by the rapid growth of new energy vehicles, 5G communications, and lightweight industrial equipment, global demand for high-performance engineering plastics continues to expand.
Supported by its annual production capacity of 180,000 tons and comprehensive specialty PBT product portfolio, Yizheng Chemical Fiber continues to accelerate the domestic substitution of imported high-end PBT materials. Meanwhile, the company is actively advancing biodegradable polyester technologies, establishing a dual development strategy that integrates traditional engineering plastics with sustainable bio-based materials.
Through continuous technological innovation and integrated industrial capabilities, Yizheng Chemical Fiber is strengthening China's self-sufficiency in advanced polyester materials while providing reliable raw material support for the country's rapidly evolving new materials industry.
