You are currently viewing the James Walker Australia & New Zealand website. Click here to view the Global website.

Shieldseal banner


High performance elastomers specifically formulated for nuclear applications requiring resistance to ionising radiation.

  • Nuclear

Shieldseal materials are James Walker's proprietary materials specifically designed to resist ionising radiation. Their change in physical properties has been monitored over time with gamma radiation to prove compression-set resistance and long service life.

Shieldseal 663 - a highly-developed EPDM-based elastomer of nominal 80 IRHD for moulded components such as O-rings. This material has been subjected to extensive radiation / ageing testing to replicate a 40-year lifespan through independent third party testing which demonstrated that Shieldseal 663 significantly outperforms existing industry standard materials.

Shieldseal 664 - a further extension of the Shieldseal 663 compound, developed for extrusion manufacturing and use where a softer, more pliable compound is required. With a nominal 65 IRHD hardness, this material is particularly suitable for products such as inflatable seals or door seals. The compound has been subjected to extensive radiation/ageing testing and results show an indicated life-span in excess of 30 years.

Shieldseal 661 - EPDM-based elastomer for liquid and gas sealing in the presence of ionising radiation, where only low closing forces are available. Nominal hardness 55 IRHD.

Shieldseal 662 - EPDM-based elastomer for general applications where ionising radiation is present. Nominal hardness 70 IRHD.

Shieldseal 621- nitrile elastomer (NBR) designed for radiation resistance. Also excellent resistance to mineral oils, water/glycol hydraulic fluids, and a wide range of chemicals. Nominal hardness 60 IRHD.

Related Downloads

Materials for use in nuclear applications

English pdf (4 MB) Download

Nuclear standard industry materials

In addition to our own compounds and materials that we have developed for customers, James Walker has a long history of expertise in processing industry standard materials and customer specific materials such as EPDM 30H.

Find out more
Nuclear standard industry materials

Expert to Expert

Want to discuss your project, engineering or materials challenge expert to expert? Simply provide us with your contact details and a little information about the application you are working on, and one of our experts will contact you as soon as possible.

Contact us