Telephone Cables Limited

Associated Electrical Industries Limited

Robert J Powell

Brian A Irving

Oliver S Johnson

This invention relates to a sealing composition for a mineral insulated electric cable termination. The sealing composition includes an inert filler such as silica flour, a low vapor pressure organic material such as a polyphenyl ether and an aerosil. This composition has improved slump resistance at high temperatures with little run out and no tendency to crack at 250.degree. C.

Sealing composition and a mineral insulated electric cable termination

An optical fibre cable includes, within a surrounding cover, at least one optical fibre extending longitudinally, and a hydrogen-absorptive material comprising a metal cation and an organic anion, preferably dispersed or dissolved in a water-blocking compound. The hydrogen-absorptive material may be a metal salt, preferably a silver salt, of a carboxylic acid, or else a metal loaded ion exchange resin.

Optical fibre cables

An optical fibre cable contains a quantity of hydrogen trapping material distributed along it for example within each channel containing one or more optical fibres.

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Middlesex, United Kingdom

Robert J Powell