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Appearance: Yellow flake. Chemical formula: Na2S Na2S: 60% ±2 Na2SO3: <2% Na2CO3: <0.5% Fe: 0,008 % Insoluble: < 10ppm Density: 1600kg/m3. Melting point: 90oC. Storage condition: Store in a cool, dry, well-ventilated area, out of direct sunlight. Store away from heat and ignition sources. Store away from incompatible materials such as oxidizing materials, or acids. Packingi: 25kg/ PE bag