Microbiological deterioration of rubber insulation

RESEARCH DEVOTED to developing rubber insulations resistant to micro-organisms has given two major results: 1. Compounds showing normal insulation resistance with no failures after 4 years in accelerated soil tests in which ordinary compounds fail in about 6 months; 2. Proof that the destructive organisms are fungi, and that these cause loss of insulation resistance and dielectric strength by growing through the insulation.