MOLYKOTE® 4 Electrical Insulating Compound – Silicone Dielectric Grease for Electrical Connectors 100g Tube

MOLYKOTE® 4 Electrical Insulating Compound is a silicone-based dielectric grease designed to provide electrical insulation, moisture protection, and lubrication for electrical and electronic assemblies. The compound features a semi-flowable consistency that allows it to penetrate complex geometries while maintaining reliable sealing and insulation performance.
This electrical insulating compound offers high dielectric strength and excellent electrical resistance, making it suitable for protecting connectors, terminals, and electrical contacts exposed to moisture, contaminants, or harsh environments. The silicone formulation provides strong adhesion to metals, elastomers, polymers, and ceramic materials, allowing the compound to function effectively as both a lubricant and protective sealant.
MOLYKOTE 4 Compound also exhibits excellent resistance to oxidation, low volatility, and strong water repellency, helping prevent corrosion and electrical leakage in sensitive electrical systems. The compound maintains stable performance across a wide operating temperature range, ensuring reliable insulation and lubrication in both low-temperature and elevated-temperature environments.
Typical industrial applications include lubrication and sealing of cable connectors, battery terminals, electrical junctions, ignition systems, and sealed electrical assemblies. The compound is also used for rubber seals, polymer and elastomer O-rings, and metal-to-rubber or metal-to-polymer assemblies requiring moisture-resistant sealing and electrical insulation.
MOLYKOTE 4 Electrical Insulating Compound is widely used in transportation systems, electrical equipment, industrial machinery, and maintenance applications requiring durable dielectric protection and environmental sealing.

Key Selection Proof Points
Chemical type: Silicone oil with inorganic thickener
Appearance: White, translucent compound
Service temperature range: −54 °C to +200 °C
Dielectric strength: 350 V/mil (0.05 inch gap)
Volume resistivity:
• 23°C: 1 × 10¹³ ohm-cm
• 177°C: 1 × 10¹² ohm-cm
Penetration (unworked): 230 mm/10
Penetration (worked): 245 mm/10
Bleed (30 hr at 204°C): 4.5%
Evaporation (30 hr at 204°C): 1.0%
Dielectric constant: 2.8 (1 kHz – 10 MHz)
Typical applications: electrical connectors, battery terminals, ignition systems, O-rings, rubber seals, cable junctions, electrical insulation and moisture sealing