Lubricants for high-voltage HV connectors in electric vehicles
High-voltage connectors in electric vehicles have become increasingly numerous, and their functionality is critical to the proper functioning of the car. To ensure the reliability of such connectors, specially formulated lubricants must be used. MOLYKOTE® offers a range of lubricants for high-voltage HV connectors, specifically for electric vehicles, that ensure adequate sealing performance and consistent electrical conductivity over time.
MOLYKOTE®: Special Lubricants for HV Connectors
The elastomer seal, which prevents moisture infiltration, requires proper lubrication to prevent microcracking during assembly and simplify the process.
MOLYKOTE® 111 Compound
e MOLYKOTE® HP-300 Grease are the ideal solution for this need, offering excellent water resistance and superior sealing performance. In addition, both products have highdielectric strength, making them suitable for high-voltage environments.
To ensure consistent electrical conductivity over time, the metal seal pins require adequate lubrication. MOLYKOTE® L-8030 semi-dry lubricant is designed to reduce wear and fretting corrosion caused by vibration, reducing insertion force and protecting metal from oxidation. Field tests showed that the use of MOLYKOTE® L-8030 did not affect electrical conductivity and maintained constant friction values for more than 250 mating cycles.
High dielectric strength and good compatibility with elastomers
Featuringhigh dielectric strength and good compatibility with elastomers, MOLYKOTE® connector lubricants are the ideal choice for ensuring thereliability and performance of high-voltage connectors in electric vehicles.
Note: The values presented are not intended for the preparation of specifications. It is recommended that you contact your local MOLYKOTE® representative before drawing up specifications for these products.
| Properties | Method(1) | MOLYKOTE® 111 Compound | MOLYKOTE® HP-300 Grease |
| Dielectric strength, 50 mils gap | ASTM D149 | 320 volts/mil | 296 volts/mil |
| Dielectric strength, 10 mils gap | ASTM D149 | 476 volts/mil | 631 volts/mil |
| Dielectric constant, 1 kHz | ASTM D150 | 2.75 | 1.99 |
| Dielectric constant, 1 MHz | ASTM D150 | 2.81 | 2.02 |
| Dielectric constant, 10 MHz | ASTM D150 | 2.74 | 2.00 |
| Arc resistance (mean) | STM D495 | 184 sec | |
| Volume change, rubber (SRE-NBR-28/PX, 168 h at 70°C) | ASTM D471 | -0.4% | -0.1% |
| Waterproof seal (24 h at 25°C) | AMS 8660 | Pass | Pass |
(1)ASTM: ASTM International. AMS: Aerospace Materials Specification. |
Characteristics of MOLYKOTE® special lubricants.
Lubrication of seals
- Compatible with many plastics and elastomers
- Excellent water resistance
- Low vapor pressure/volatility (only 0.8% evaporation after 30 hours at 204°C)
- Excellent compatibility with plastics and elastomers
- Superior resistance to chemicals and solvents (including water)
- Resistance to high temperatures (up to 250°C)
- Low vapor pressure
- High dielectric strength and arc resistance
Lubrication of metal pins
MOLYKOTE® L-8030 Semi-dry lubricant
- Good compatibility with plastics and elastomers
- Non-sticky after drying
- Ultra-thin and transparent lubricating layer
- Does not affect electrical conductivity
