scope:

This specification is one of a series issued by the Ministry of Supply either to meet a limited requirement not covered by any existing British Standard Specification, or to serve as a basis for inspection of material the properties and uses of which are not sufficiently developed to warrant submission to the British Standard Institution for Standardisation.

Except where otherwise stated the method of testing shall be as described in British Standard Methods of Testing Vulcanised Rubber, No. 903-1940.

This specification covers two grades of material, A and B, of different hardness; Grade B being the harder. The grade required must, therefore, be stated on the Order.