continue to improve, to ensure product quality in line with market and customer standard requirements. Our company has a quality assurance system have been established for Sodium HydroSulphide and Na2s, Superalkali , Sodium Bisulfide , sodium polysulfide ,natriumwaterstofsulfide gehydrateerd . Please feel free to contact us at any time. We will reply you when we receive your inquiries. Please note that samples are available before we start our business. The product will supply to all over the world, such as Europe, America, Australia,Greece , Slovakia ,Boston , Bandung .We have to continue to uphold the quality, comprehensive, efficient business philosophy of honest, responsible, innovativespirit of service, abide by the contract and abide by reputation, first-class products and improve service welcome overseas customers patrons.