Molykote 4 Electrical Insulating Grease, NLGI 2, -40 to 200°C
Molykote 4 is an electrical insulating compound with inert silica filler in polydimethyl silicone fluids, appearing as a white translucent grease (NLGI Grade 2). Key features include high dielectric strength (460 V/mil), stability from -40°C to 200°C, low volatility, and moisture resistance, complying with SAE AS 8660 and FDA 21 CFR 175.300 standards.
| Standard | Test Property | Unit | Result |
|---|---|---|---|
| CTM 0176 | Color | - | White; translucent |
| CTM 0191 | NLGI consistency number | - | 2 |
| - | Penetration unworked | mm/10 | 220 |
| - | Penetration worked 60, max | mm/10 | 310 |
| CTM 0033A | Evaporation (30h/200°C) | % max | 2.0 |
| - | Service temperature range | °C / °F | -40 to 200 / -40 to 392 |
| CTM 0022 | Density at 25°C | g/ml | 1.0 |
| Standard | Test Property | Unit | Result |
|---|---|---|---|
| CTM 0114 | Dielectric strength (1.27mm gap) | V/mil | 460 |
| CTM 0112 | Dielectric constant @100 Hz | - | 2.98 |
| CTM 0112 | Dissipation factor @100 Hz | - | <0.0001 |
| CTM 0249 | Volume resistivity @23°C | Ohm*cm | 1.1×10¹⁵ |
| CTM 0171 | Arc resistance | seconds | 135 |
Engineered for electrical insulation and sealing with lubrication capabilities, Molykote® 4 utilizes a silica-enhanced formula to deliver exceptional dielectric properties (dielectric constant 2.98@100Hz) and volume resistivity (1.1×10¹⁵ Ω*cm). Certified to NSF 51/61 for food contact, it resists water/methanol/mineral oil but disperses in xylene/mineral spirits for spray/dip applications.
Beyond insulation, Molykote 4 exhibits ultra-low dissipation factor (<0.0001@100Hz) and 135-second arc resistance. Its chemical stability withstands dilute acids/alkalis/oils, while thermal oxidation stability limits evaporation to ≤2.0% at 200°C (30hrs). Note: It degrades silicone rubber and is incompatible with liquid oxygen.
Widely used for moisture-proof sealing in aviation/automotive ignition systems, spark plugs, and cable connectors (e.g., high-voltage connectors). As an assembly lubricant, it suits metal-plastic/rubber components (e.g., door seals, O-rings). Industry-proven cases include Tesla battery terminal anti-corrosion and marine electrical box waterproofing (Source: Molykote® official application database).
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