... % MAX4, Color: colorless5. Free Acid: 0.03% max6. Grade Standard: caprolactam7. size: 1.5-4mm8. sulfur: 24%min Physical property ... white powder, easily soluble in water, aqueous solution appears acid. and ... industry ,pharmaceuticals,textiles,welding industry,Dyeing auxilizries of acid dyes,Deliming agent of leather,Beer making,Chemical agentStorage ...