Super Lube 91003 Silicone Dielectric & Vacuum Grease, 3 oz Tube

Super Lube 91003 is Super Lube dielectric grease in a 3 oz tube: a non-curing silicone compound that seals, protects and insulates electrical components and connectors and keeps moisture and contaminants out of contact points. The same grease is a vacuum grease with very low vapor pressure and outgassing, used on stopcocks, plug valves, gaskets and vacuum or pressure fittings. It is translucent white, NLGI 2 and NSF H1 registered (#141973).

Key features

• Dielectric strength 777 V/mil (ASTM D149, 50 mil gap); helps prevent arcing
• -40°F to 500°F (-40°C to 260°C); no melting point; 0% oil separation
• Vapor pressure 5 × 10⁻¹⁰ Torr at 25°C; outgassing TML under 1.0% and CVCM under 0.1% (ASTM E595)
• Water washout under 1%; high resistance to water and chemicals
• NSF H1, Kosher and Halal; PFAS-free per super-lube.com; made in USA

Where to use it

Spark plug boots and distributor caps, battery cables, electrical assemblies and terminals, cable connections, terminal strips and disconnects, light bulbs, rubber gaskets, glass-to-rubber boundaries, ceramic plug gaskets, control and plug valves, stopcocks, flow meter bearings, and sealing of vacuum, pressure and chemical process equipment. H1 registration also covers food-processing and water-treating equipment.

How to use

1. Disconnect power before working on electrical connections.
2. Clean the mating surfaces.
3. Apply evenly; on connectors, coat the seal, boot and housing so moisture cannot get in.
4. Assemble and wipe away the excess.

Compatibility and cautions

Compatible with the majority of rubber and plastic compounds, per Super Lube. Dielectric grease is an insulator: it does not improve conductivity and should not replace a clean, tight metal-to-metal connection. It is not a thermal compound either; its thermal conductivity is 0.16 W/m·K, against 2.174 W/m·K for Super Lube 98003 Heat Sink Compound. Read the SDS.

Choosing between 91003 and related products

For battery terminals and connectors that mainly need corrosion protection, Super Lube 82003 Anti-Corrosion & Connector Gel is a thinner NLGI 0 gel. For general silicone lubrication of plastic and rubber parts with added PTFE, use Super Lube 92003 Silicone Lubricating Grease; for O-rings in quantity, Super Lube 93016 O-Ring Silicone Grease. See our dielectric grease collection.