Patent ID: 6342679
Filing Date: 2002-01-29
Classification: B29C,B29K,B29L,H01B,H02G

Abstract:
A tubular elastic covering to cover electric components for use in an outdoor environment, comprising an inner insulating layer and an outer insulating layer wherein:the inner and outer insulating layers are made of blends of cross-linked polymeric materials and are formed coaxially with each other, superposed and bonded together; the inner insulating layer has a residual deformation lower than the outer insulating layer; the inner insulating layer is pre-expandible by at least 20% of its inner diameter; the inner insulating layer, after an elastic pre-expansion of 100% of its inner diameter for 40 days at 65Â° C. when mounted on a support tube, keeps in use an interference on said electric component of at least 10%; the outer insulating layer has a resistance to tracking of at least class 2.5 measured according to IEC 587 (1984); and the outer insulating layer has a resistance to radiation, measured with a Xenon arc lamp having a power of 6500 W at a distance of 48 cm for at least 2500 hours.