... Fe:1500ppm,150ppm,80ppm,50ppm,30ppm,15ppm,5ppm Products name: Sodium Sulphide, Sodium SulfideMolecular Formula: Na2SSpecification: 60%CAS NO. 1313-82-2H ... : 0.0015%/0.0010%max 15/10ppmCharacter: Solid-fused or granular, brown red color, soluble in water, presenting strong alkaline solution ... paper-making. also widely in pigment and rubber industry, etc. sodium sulphide