HV Heat Shrink Joint. Polymeric insulated cables of various designs can be adapted with respect to shielding and metal sheath. Raychem heat shrink accessories have been used by utilities and industrial companies around the world for over 40 years. The ongoing ﬁeld experience makes Raychem a leader in materials science and technology for high voltage applications. The materials used in TE Connectivity Raychem cable accessories are extensively optimized with respect to product design, function, manufacturing and expected service environment.