Mechanical seals spring should have adequate strength, resistance to media corrosion and long-term use in the operating temperature does not decay or decay very little stiffness. Commonly used spring materials are phosphor bronze, beryllium copper. Phosphor bronze and beryllium copper springs used in the oil and seawater; carbon steel spring is appropriate for the room temperature corrosion-free medium; 50CrV mostly used for high-temperature oil medium, low chrome steel for corrosive media; stainless steel can be used to dilute nitric acid, acetic acid, urea and other corrosive media, a number of strong acid needed for the use of coating steps.
Other parts, though not the major part of mechanical seals, but the choice of materials can not be ignored. Because a problem with any one part will lead to seal failure. These components include the spring seat (box), drive seat, thrust ring, screws and such sleeve and gland. Demands on their consciousness is sufficient strength and corrosion resistance.