It is applicable for all kinds of corrosive chemicals, including strong corrosive liquids (such as liquid strong alkali, hydrochloric acid and sulfuric acid), organic solvent and liquid nitrogen, etc. It is widely used in the sealing of industrial equipments such as flange, valve, reaction kettle, pump, pressure vessel, heat exchanger, condenser, electric generator, air compressor, exhaust pipe and refrigerating machine in the fields of petroleum, chemical engineering, chemical fiber, coal mining, electric power generation and metallurgy.