Sales of high-performance membrane materials, manufacturing and sales of plastic additives (excluding hazardous chemicals), sales of feed additives, pharmaceutical and chemical raw materials (except hazardous chemicals), import and export business of various commodities and technologies (except commodities and technologies that are limited by the state or prohibited from import and export). (For projects that must be approved according to law, business activities can only be carried out after approval by relevant departments) Licensed projects: production of dangerous chemicals; Management of hazardous chemicals (for projects subject to approval according to law, business activities can only be carried out after approval by relevant departments, and the specific business projects shall be subject to the approval results)