Melamine, Urea, Sodium Nitrite manufacturer / supplier in China, offering N, N-Dimethylformamide Purity 99.9% Minimum/ DMF, 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 and so on.