CRC - Di-Electric Grease -.5 oz. - 05109. A unique, non-curing compound used for sealing, protecting & electrical insulating. Improves electrical performance by reducing arcing, voltage drop & other conditions. Also ideal for lubrication of plastic & rubber.. Applications:. Electrical connections, circuit breakers, contacts, spark plug boots, trailer connectors, HEI distributor, battery terminals, contacts, lubrication of plastic, rubber parts & o-rings. Features:. Size -.5 oz.