According to enterprise data, Tangshan Sanyou Silicon Industry Co., Ltd. was established in 2007- 1 1-09, and its business scope includes monomethyl trichlorosilane, trimethyldichlorosilane, monomethyl dichlorosilane, silicone low boilers, dimethyldichlorosilane, nitrogen, methyl chloride, dilute sulfuric acid (75%) and dilute hydrochloric acid. (detailed varieties are more dangerous). Contact manufacturing and sales (excluding dangerous chemicals); The export business of self-produced products and technologies of this enterprise, and the import business of raw and auxiliary materials, machinery and equipment, spare parts and technologies required by this enterprise; Ordinary freight; Heating production (projects subject to approval according to law can only be operated after approval by relevant departments) * *