The main product 210D-4500D ultrahigh strength polypropylene yarn filament has the characters of acidproof , ageingproof & alkali resistant , shrinking little with heat , strong breakness , as well as lowest price . It is widely used in the fields of industrial belt , safety belt , conveying belt , fibre cloth , industrial sewing thread , etc. It is the ideal chemical fibre material to instead of polyamide fibre ,polyester fibre .