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Elastomers

Elastomers are polymers with viscoelasticity (meaning both viscosity and elasticity), generally amorphous polymers with cross-linked network structure. They deform with low stress, and when the stress is removed, return to their original shape.

Hydraulic seals are generally made from elastomers, natural and synthetic polymers, which possess weak molecular attraction and highly elastic properties. Two major sources for hydraulic seals are rubber and plastics (including PTFE, such as Teflon, and polyurethane). Other elastomer materials used to fabricate seals include butadiene, nitrile, butyl, and silicone.

• NITRILE RUBBER (NBR)

  • Working Temperature Range: -40° C to+ 125° C
  • Standard Colour: Black
  • Application: For low temperature at rotary shaft or reciprocating shaft.
  • It has excellent resistance to grease, muddy water, hydraulic oil, engine oil, gear oil while it does not offer such resistance against synthetic lubricant oil.

• POLYACRYLIC RUBBER

  • Working Temperature Range: -30° C to + 150° C
  • Standard Colour: Black
  • Application: For medium temperature at rotary shaft.
  • It offers better heat and oil resistance than nitrile rubber. It has excellent resistance to lubricant oil and poor resistance to gear oil or acids.

• SILICONE RUBBER

  • Working Temperature Range: -60° C to+ 200° C
  • Standard Colour: Dark Red
  • Application: For high temperature at rotary shafts.
  • It has better heat or oil resistance than poly-acrylic rubber and offers excellent resistance to engine oil and has poor resistance to gear oil & fuel oils.

• VITON/FLUOROELASTOMER

  • Working Temperature Range: -30° C to + 230° C
  • Standard Colour: Brown
  • Viton rubber can be used in harsh environments as it exhibits high chemical resistance. Viton has excellent resistance to steam, mineral oils, fuel oil & lubricating.

• PTFE/ GLASS FILLED PTFE

  • Working Temperature Range: -175° C+ 250° C
  • Standard Colour: Off-White
  • PTFE seals are used for special applications which require chemical inertness. PTFE offers excellent resistance to high temperature water, fuel oil & various chemicals.

The choice of material for oil seal depends upon its application and customer needs.