Raychem Limited

Paul Taylor

Richard J Penneck

Neil J Steptoe

Cable-sealing mastic material

Novel polymeric compositions having non-linear resistance characteristics, together with electrical equipment comprising such compositions. Any polymer may be used; the polymer contains substantial proportions of certain particulate fillers of a given structure, for example the perovskite and spinel structures.

Polymer compositions for electrical use

A polymer composition containing silicon carbide of a critical maximum average particle size can be processed into heat-shrinkable articles possessing nonlinear electrical resistance characteristics. An embodiment of the invention provides a heat-shrinkable article comprising a laminate of a layer of elastomer, including silicon carbide particles, and a layer of a heat-shrinkable polymeric material. The elastomeric layer may be a blend of a rubbery polymer and a low density polyethylene having dispersed therein particulate silicon carbide of particle size finer than about 300 grit.

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Purton Wilks, United Kingdom

Paul Taylor