... % MIN3, Moisture: 0.3 % MAX4, Color: colorless5. Free Acid: 0.03% max6. Grade Standard: caprolactam7. size: 1.5- ... white powder, easily soluble in water, aqueous solution appears acid. and Insoluble in alcohol, acetone,ammonia; easy to become ... industry ,pharmaceuticals,textiles,welding industry,Dyeing auxilizries of acid dyes,Deliming agent of leather,Beer making,Chemical agentStorage battery making, ...