Felt Gear Prices, Polyester features excellent wrinkle resistance, elasticity, and dimensional stability, excellent electrical insulation properties, resistance to sunlight and abrasion, and is not prone to mold or insects. It also has good resistance to chemicals, able to withstand weak acids and bases. The industry refers to it as synthetic fiber, which comes in large and small varieties. Large synthetic fiber refers to涤纶 fiber produced from high-quality PET chips. Small synthetic fiber refers to fibers produced by some small and medium-sized factories using lower-quality recycled materials and PET chips.