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The Selection Of Commonly Used Materials For Mechanical Seals
- Oct 04, 2018 -


Clear water, normal temperature: (dynamic) 9Cr18, 1Cr13 surfacing cobalt chromium tungsten, cast iron; (static) impregnated resin graphite, bronze, phenolic plastic.

River water (including sediment), normal temperature: (moving) tungsten carbide, (static) tungsten carbide.

Sea water, normal temperature: (dynamic) tungsten carbide, 1Cr13 surfacing cobalt chromium tungsten, cast iron; (static) impregnated resin graphite, tungsten carbide, cermet.

Superheated water 100 degrees: (dynamic) tungsten carbide, 1Cr13 surfacing cobalt chromium tungsten, cast iron; (static) impregnated resin graphite, tungsten carbide, cermet.

Gasoline, lubricating oil, liquid hydrocarbon, normal temperature: (dynamic) tungsten carbide, 1Cr13 surfacing cobalt chromium tungsten, cast iron; (static) impregnating resin or tin-bismuth alloy graphite, phenolic plastic.

Gasoline, lubricating oil, liquid hydrocarbon, 100 degrees: (dynamic) tungsten carbide, 1Cr13 surfacing cobalt chromium tungsten; (static) dip bronze or resin graphite.

Gasoline, lubricating oil, liquid hydrocarbons, containing particles: (dynamic) tungsten carbide; (static) tungsten carbide.

5. Types and uses of sealing materials

The sealing material should meet the sealing function requirements. Due to the different media being sealed and the different working conditions of the device, the sealing material is required to have different adaptability. The requirements for sealing materials are generally:

1) The material is dense and difficult to leak.

2) Have proper mechanical strength and hardness.

3) Good compressibility and resilience, and small permanent deformation.

4) It does not soften under high temperature, does not decompose, does not harden at low temperature, and does not crack.

5) Good corrosion resistance, long-term work in acid, alkali, oil and other media, its volume and hardness change is small, and it does not adhere to the metal surface.

6) The friction coefficient is small and the wear resistance is good.

7) Has softness combined with the sealing surface.

8) Good aging resistance and durability.

9) It is easy to manufacture and manufacture, cheap and easy to obtain.