Shieldseal^®

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.