Melamine, Urea, Sodium Nitrite manufacturer / supplier in China, offering High Purity 99.5% CAS No. 85-44-9 Phthalic Anhydride PA Flakes Grade, Caustic Soda Flakes and Pearls Naoh Sodium Hydroxide for Paper Making, Caustic Soda Flakes Sodium Hydroxide Naoh High Purity 98.5% 98% and so on.