Research and development of chemical product technology, sales of chemical products (excluding hazardous chemicals), rubber products (excluding medical rubber products), electromechanical products, environmental protection products, cleaning products, textile products, plastic products, metal materials (excluding rare and precious metals), hardware and electrical supplies, mechanical equipment (excluding special equipment), floor tiles, fertilizers, self-operated and agency import and export of various domestic goods and technologies (excluding goods and technologies restricted or prohibited by the state). (Projects subject to approval according to law shall commence operations only after obtaining approval from relevant authorities.)