In this safety critical market, close attention to raw materials and cleanliness is essential. Compounds must be strictly controlled to specification. Even minor changes to raw materials, which are not picked up by standard physical tests, can result in reduced performance of components in service.

Clwyd works closely with its raw material suppliers to ensure minimal variation in incoming polymer properties, and will not change approved formulations without testing, evaluation and customer authorization. In addition to our standard quality control checks, specific testing regimes can be established for these critical compounds, including dispersion checks. Our databases provide full batch traceability, and include weighing and mixing records. Customer audits and site visits are always welcomed.

Compound selection will be governed by the expected radiation level in the working environment. Some polymers are prone to continued curing in the presence of radiation, which will result in loss of elasticity and therefore sealing properties.

EPDM, NBR and FKM polymers are widely used in this industry.