The materials covered by this specification are intended for the production of items such as sheets, mouldings and certain extrusions, mainly for sealing applications where good fluid resistance and low compression set are of prime importance. They can beusEd in contact with phosphate ester hydraulic fluids for continuous operation within the temperature range -60 C to 100°C or up to 130°C for intermittent periods and with silicone hydraulic fluids within the temperature range -60°C to 130°C for continuous operation or up to 160°C for intermittent periods.

For applications in contact with air they may also be considered for use within the temperature range -60°C to 120°C. They have excellent ozone resistance. They are unsuitable for use in contact with fuels, mineral oil based and diester oils and silicate fluids or greases derived from these.

NOTE. At ordinary temperatures and in the absence of hostile environments, e.g. when properly stored, these rubbers deteriorate only very slowly. However, the rate of deterioration increases markedly with increased temperature and the service life of a rubber therefore depends upon the operational temperature. Conversely, the maximum temperature at which a rubber may be used depends upon the useful life required.