... 0.1% max 4)Melting point: 175Cmin thiourea is the main raw material of thiourea dioxide,as a fine chemical product with ... widely used in pharmaceutical raw material,textile dyeing and printing,metal-mine-selecting,and laundering.In macromolecule material industry,it is used ... 6, plating additive; 7, used in the production of gold and electrolytic copper; 8, material of resin pressed powder; 9, used to ...