scope:

This specification relates to high quality, black, halogenated butyl rubber mixes intended primarily for the manufacture of NBC over boots.

The designation 'Type NBC' indicates that the quality of the material is such that, when correctly vulcanized, the material is resistant to penetration by biological and chemical agents. The composition of the mix is therefore precisely defined.

Resistance to all biological and chemical agents in all environments, however, has not been established and Design Authorities should seek advice on particular applications from:

The Director, CDE, Porton Down, Salisbury, Wilts.