Rubber insulation

The question of the supply of natural and synthetic rubber and their uses in electrical insulation continues to be an important one. In the country as a whole, the proportion of synthetic rubber used fell to about 42 per cent in 1947. About 80 per cent of the rubber used in electrical insulation was synthetic, since this material is preeminently adapted to this use. It would have been still greater had not a shortage of GR-S developed. This shortage was caused by the premature closing by the Government of some synthetic rubber plants.