Changzhou Guoyu Environmental Protection Technology Co., Ltd.

Manufacturing of food additives (sodium carboxymethylcellulose), silver oxide, and silver nitrate; manufacturing and sales of silver paste and silver powder; silver chloride, silver iodide, silver carbonate, silver sulfate, chloroauric acid, industrial by-product salt, and concrete admixtures , manufacturing and processing of sewage treatment equipment, precious metal products, plastic industrial accessories, mechanical parts, high-strength corrugated composite boards and their products; research and development, technical consulting and transfer services of environmentally friendly products; sewage treatment; handicrafts, chemical raw materials (except dangerous goods) ) sales; silver purification; precious metal refining and processing (except for special national regulations); manufacturing, processing, and sales of precious metal alloy inserts, non-fading ink for marking, election ink, non-removable ink, and stamp ink. (Projects that require approval according to law can only be carried out with the approval of relevant departments)