When thermal density is high and the voltage across the interface demands serious insulation, the top of the HV series becomes necessary. Parker Chomerics CHO-THERM HV3320 is the highest-conductivity grade in the CHO-THERM HV line, delivering 3.3 W per meter-Kelvin apparent thermal conductivity in a 0.040-inch profile. Its breakdown voltage exceeds 20 kilovolts DC. At NEDC, we convert HV3320 for customers who need maximum thermal performance and the highest dielectric margin CHO-THERM HV provides.
Key Specifications
- Color: Gray
- Carrier: Thermally enhanced polyimide
- Thickness: 0.040 in (1.0 mm) with plus or minus 10 percent tolerance
- Apparent Thermal Conductivity: 3.3 W per meter-Kelvin (ASTM D5470)
- Thermal Impedance: 0.293 degrees C-inch squared per watt
- Breakdown Voltage DC: greater than 20.0 kV (7.31 kV AC, ASTM D149)
- CTI: Material Class I, Carrier Class II (ASTM D3638)
- Hardness: Shore 00 35 (ASTM D2240)
- Specific Gravity: 3.4 (ASTM D792)
- Heat Capacity: 1 J per gram-K (ASTM E1269)
- Coefficient of Thermal Expansion: 150 ppm/K
- Flammability: UL 94 V-0
- Outgassing: 0.11 percent TML, 0.09 percent CVCM (ASTM E595)
- RoHS Compliant: Yes
- Operating Temperature: minus 67 to 392 degrees F (minus 55 to 200 degrees C)
- Shelf Life: 18 months dry, 12 months with PSA
Why HV3320?
HV3320 is the only CHO-THERM HV grade that exceeds 3.0 W per meter-Kelvin. Its 0.293 degrees C-inch squared per watt
thermal impedance makes it the most efficient heat conductor in the family despite being the thickest. This is because the higher filler loading in the thicker matrix overcomes the added thickness penalty. For high-voltage bus assemblies and power modules where the gap naturally runs larger, HV3320 turns that extra thickness into an actual advantage.
Typical Applications
- High-voltage bus assemblies and power distribution
- Power conversion and uninterruptible supplies at elevated voltage
- Industrial inverters and motor drives with large gaps
- Aerospace power distribution where outgassing is specified
- Systems requiring the maximum thermal and dielectric margin from CHO-THERM HV
NEDC stocks and converts HV3320 in the standard 10 by 15 inch sheet size with or without PSA. For thinner alternatives, see HV2320. For standard CHO-THERM products, browse our gap filler pad guide.