scope:

This Standard relates to five high quality natural rubber compounds designated NR QX followed by a number equal to the nominal hardness.of the vulcanizate as given in the Table on page 7. Black or white versions of each quality are specified. The compounds are suitable for the production of fabricated items such as sealing rings, gaskets, sheet, and items cut or punched from sheet or tube.

The designation 'Type QX' indicates that the material is suitable for cer.tain applications where a high degree of compatibility with explosives is a requirement. However, compatibility with all explosives in all environments has not been established and Design Authorities should seek advice on particular applications from the Director, Propellants, Explosives and Rocket Motor Establishment, Waltham Abbey, Essex EN9 1BP.

The vulcanized mixes do not necessarily have good electrical insulating properties .