Silicone Rubber for high voltage insulator applications Innosil HV-65 is a 65 durometer silicone rubber molding compound for high voltage insulator applications which require excellent performance in contaminated environments. Typical applications include composite insulators, arrestors and bushings. Excellent Tracking and Erosion Resistance Low plasticity for ease of injection molding Superior Water Repellency (Hydrophobicity) Good mold release Good Dielectric Strength Low Leakage current