Both F7000 and F8000 flame-retardant fibers are phosphorus-based copolymer flame-retardant polyester fibers. Their core advantage is that they have permanent flame-retardant effects and are widely used in safety protection, home textiles and industrial fields. The two are highly consistent in terms of basic safety performance, but there are differentiated upgrades in key dimensions such as flame retardant efficiency and thermal stability to adapt to the use needs of different scenarios. The following is a detailed feature analysis.

Both share core common features. First, it is intrinsically flame-retardant and has long-lasting performance. Through the copolymerization and integration of flame-retardant monomers and polyester molecular chains, the flame-retardant components are integrated into the essence of the fiber instead of the surface coating. It can still maintain the flame-retardant effect after more than 50 times of washing, with no precipitation or attenuation, and complies with GB8624-2012 B1 level flame retardant standards and EU EN related specifications. Secondly, it has excellent safety protection, with a limiting oxygen index (LOI) of ≥32%. It can quickly self-extinguish when exposed to fire and has no molten drippings, which can effectively avoid secondary burns. It has low smoke generation and low toxicity during combustion, and the smoke toxicity level reaches ZA1 level, complying with RoHS and REACH environmental protection requirements. Third, it retains the basic advantages of polyester, with a breaking strength of ≥3.8cN/dtex and an elongation at break of 25%-35%. It is wear-resistant, wrinkle-resistant, easy to wash and quick-drying, and has strong spinnability. It is suitable for POY, DTY, FDY and other spinning processes, and can be blended with cotton, viscose and other fibers. It has good dyeing performance and a color fastness of level 4 or above.

Differentiating characteristics are the core distinguishing points between the two. In terms of flame retardant performance, F7000 flame-retardant fiber reaches UL94 V-0 level, with a vertical combustion afterburning time of ≤2s and a damage length of ≤8cm, which can meet the needs of conventional safety protection. F8000 is upgraded on this basis, with a burnout time of ≤1s and a damage length of ≤6cm. It has a faster flame retardant response and more accurate protection. In terms of thermal stability, F7000 has a melting point of 255-260°C and a heat distortion temperature of 180°C; F8000 has a melting point increased to 260-265°C and a heat distortion temperature of 190°C, making it more suitable for use in high temperature environments. In terms of mechanical strength, the breaking strength of F7000 is 3.8-4.0cN/dtex, while that of F8000 is increased to 4.0-4.2cN/dtex, with better durability. In addition, F8000 has added enhanced anti-static performance, with a surface resistance of 10⁸-10¹⁰Ω, which is better than F7000’s 10⁹-10¹¹Ω, and is suitable for anti-static demand scenarios such as electronics and chemical industry.

Based on the difference in characteristics, the application scenarios of the two have different emphasis. F7000 focuses on high cost performance and is suitable for civilian and general public scenes, such as curtains and wall coverings in hotels and schools, household flame-retardant mattresses, sofa fabrics, and non-high-temperature work clothes in electronics factories, clothing factories, etc. F8000 focuses on high-end protection and industrial scenarios, including fire rescue clothing, petrochemical workwear, protective clothing in the power industry, interior materials for high-speed rail, aircraft and other transportation, high-temperature smoke filter bags, military tents, camouflage nets, etc.

In summary, F7000 and F8000 flame retardant fibers take permanent flame retardancy as their core advantage. The former balances cost and performance, while the latter focuses on ultimate safety and environmental adaptability. The selection can be accurately matched according to the scene safety level, ambient temperature and cost budget. Both of them jointly promote the diversified application of flame-retardant polyester fiber in the field of safety protection.