I pp yarn produced with high-strength, anti-friction, anti-aging, anti-acid, ... -corrosion performance The main product 210D-3000D ultrahigh strength polypropylene yarn filament has the characters of acidproof , ageingproof & alkali resistant , shrinking ... , fibre cloth , industrial sewing thread , etc. It is the ideal chemical fibre material to instead of polyamide fibre ,polyester fibre .