Elastomer Technology

Shieldseal 621 - Radiation grade

A specially developed grade of nitrile (acrylonitrile-butadiene NBR) elastomer for the manufacture of moulded seals, precision cut gaskets, extruded profiles and other flexible products that are subjected to high levels of ionising radiation. 

Typical applications
General fluid sealing duties in the presence of ionising radiation, especially where there is contact with mineral oils or hydraulic fluids.

Evaluated for resistance to ionising radiation by monitoring changes in important physical properties over time while irradiated with gamma radiation. Further information on these tests as carried out by independent test house Centronic Raditec and James Walker Technology Centre can be supplied to customers on request. 

Special features

  • Excellent radiation resistance
  • Excellent compression set resistance for efficient long-term fluid sealing
  • Excellent resistance to mineral oils and hydraulic fluids
  • Resistant to wear and abraison
  • Long service life
  • Excellent value for money

Operational properties of Shieldseal 621
Hardness: 60 IRHD 
Compression set: 18%, when irradiated with a total dose of 100kGray @ 65°C. 
Chemical properties: Excellent resistance to mineral oils, hydraulic fluids (including water/glycol grades) and a wide range of chemicals.
(Typical values quoted: Please consult James Walker before using for specification purposes)

How supplied
Shieldseal 621 is available as moulded products, precision cut gaskets and extruded profiles. We are also willing to partner with equipment manufacturers and end-users to develop, prototype and evaluate materials or specific components for custom applications.

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