LONGLY’s alumina ceramic seals (alumina accounts for 95%- 99%) can be finished by mirror-polishing process. Because of high mechanical strength, strong chemical corrosion resistance, good airtightness, superior waterproof under temperature mutation, they are used as the mechanical seal and dynamic seal of various household water pump, agricultural pump and other chemical pump, and can meet the requirements of sliding and sealing in actual operating environment. Alumina ceramic seals are widely used as mechanical seal parts in the industries of metallurgy, machinery, chemical, medical, corrosion-resistant pump, automobile, aerodynamic components.