The materials covered by this specification are intended for the production of items, such as sheets, mouldings and certain extrusions, where resistance to atmospheric ageing and ozone attack coupled with moderate resistance to petroleum-based lubricants and fuels is of prime importance. For selected applications they may be considered suitable for use between -40°C and, for continuous operation, 120°C, , whilst for short periods they may be used up to 150°C.

They are not considered suitable for applications involving total immersion in petroleum-based lubricants and fuels where stability of dimensions and other properties is essential or for use incontact with ester-based liquids.

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