Mechanical Seal Material Selection

The selection of mechanical seal materials is mainly based on working conditions, medium properties and use requirements. Under light load conditions, you can choose materials such as resin-impregnated graphite, ductile iron, and bronze; under heavy load conditions, you need to choose wear-resistant and corrosion-resistant materials, such as tungsten carbide and silicon carbide. In addition, the selection of metal materials should take into account the influence of corrosion and alternating forces. It is recommended to use materials with strong corrosion resistance, such as Hurst alloy steel. Commonly used mechanical seal materials under different working conditions Light load conditions: Resin-impregnated graphite: suitable for oil media. Ductile iron: suitable for water and seawater. Bronze: suitable for medium acid media. High silicon cast iron, aluminum-containing high silicon cast iron: suitable for medium acid media. Heavy load conditions: Antimony-impregnated graphite: suitable for high speed, high pressure, and high temperature conditions. Silicon carbide: has good thermal conductivity and is suitable for heavy load conditions. Tungsten carbide: wear-resistant, suitable for conditions with abrasive wear and corrosion. ‌Special working conditions‌: Filled with glass fiber PTFE: Suitable for working conditions with strong corrosion and no solid particles. ‌Ceramic material: Suitable for high temperature and strong corrosion environment. Selection requirements of auxiliary sealing materials Auxiliary sealing materials need to have good elasticity, low friction coefficient, resistance to medium corrosion, resistance to dissolution and swelling, and resistance to aging. Common auxiliary sealing materials include synthetic rubber, PTFE, flexible graphite and metal materials.