... vinyl-chloride vinyl-acetate copolymer, BL-4 has strong resistance to abrasion, strong water resistance, not affected by acid, base, ... under special circumstances, it is best to improve the stability of the BL-4 during processing. Epoxy stabilizers are best heat ... best to add anti-UV stabilizers.ProcessingTo avoid discoloring, both the solution and the final product should avoid iron during processing ...