we, Ruister, is a professional manufacturer and exporter of sodium sulphide and caustic soda in China.our sodium sulphide includes 10PPM, 30PPM,50PPM,80PPM,150PPM,1500PPM.our production capacity is 25,000.00MT per year; our caustic soda is mainly 99%MIN flake and pearl. our production capacity is 150,000.00MT Per year. all packing is 25KG pp bag.