When thermal density is extreme and commercial-grade pads fall short, Parker Chomerics CHO-THERM 1671 stands at the top of the standard CHO-THERM line. It is a white silicone pad rated at 2.6 W per meter-Kelvin, the highest conductivity in the standard series. Its slightly thicker 0.015-inch profile trades a small amount of compliance for significantly better heat transfer and dielectric margin. At NEDC, we convert 1671 for power conversion, motor control, and high-power semiconductor customers who need the best thermal performance CHO-THERM offers.
Key Specifications
- Material: Silicone with fiberglass reinforcement
- Thickness: 0.015 in (0.38 mm) with plus or minus 0.002 in tolerance
- Color: White
- Thermal Conductivity: 2.6 W per meter-Kelvin (ASTM D5470)
- Thermal Impedance at 300 psi: 0.23 degrees C-inch squared per watt
- Voltage Breakdown Dry: 4,000 Vac per mil (150 kVac per mm, ASTM D149)
- Volume Resistivity Dry: 10 to the 14 power ohm-cm
- Dielectric Constant at 1,000 kHz: 3.6 (ASTM D150)
- Dissipation Factor at 1,000 kHz: 0.007
- Tensile Strength: 3,000 psi (20.7 MPa, ASTM D412)
- Tear Strength: 400 lb per in (70 kN/m, ASTM D642)
- Elongation: 15 percent (ASTM D412)
- Hardness: Shore A 80 (ASTM D2240)
- Specific Gravity: 1.55 (ASTM D792)
- Flammability: UL 94 HB
- RoHS Compliant: Yes
- Operating Temperature: minus 76 to 392 degrees F (minus 60 to 200 degrees C)
- Shelf Life: Indefinite (dry); 18 months (with PSA)
- Outgassing: 0.76 percent TML, 0.07 percent CVCM (ASTM E595)
- Custom thicknesses available up to 0.060 in in 0.005 in increments
Why CHO-THERM 1671 Is the Top Choice
1671 delivers the highest thermal conductivity in the standard CHO-THERM range without jumping to entirely different material families. The 2.6 W per meter-Kelvin rating gives engineers meaningful additional margin in high-heat designs, while the thicker 0.015-inch standard profile provides extra dielectric protection. NEDC can also supply 1671 in custom thicknesses up to 0.060 inches, making it suitable for larger gaps where both isolation and conductivity are required.
Typical Applications
- Power conversion equipment and high-heat supplies
- Motor and engine controllers in high-torque systems
- Power semiconductors running at high switching frequencies
- Automotive inverters for electric drives
NEDC converts CHO-THERM 1671 in standard and custom thicknesses. Consider T500 or 1678 for slightly less conductivity at lower cost. For very high thermal density, see T-Work9000 or browse our gap filler pad guide.