Robert McKeown Company, Inc.
Robert McKeown Company, Inc.
111 Chambers Brook Road
Branchburg NJ 08876
Toll Free: 1.800.631.1125
Phone: 908.218.9000
Fax: 908.218.8949
Email: sales@robertmckeown.com
Website: www.robertmckeown.com
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CHO-THERM® HIGH-POWER THERMAL INSULATOR PADS are thermally conductive materials designed for use where the highest possible thermal, dielectric, and mechanical properties are required.

Fiberglass cloth reinforcement strengthens CHO-THERM® pads against tear, cut-through and punctures.

These materials are available in sheet form and die-cut configurations. An optional adhesive layer (with PSA) is available on one or two sides. With a proven track record spanning several decades in multiple applications, these products are the first choice for high-end power supplies, industrial, aerospace, and military/avionics applications.

Available in several different forms to suit various applications.

Features/Benefits
  • Excellent thermal properties
  • High dielectric strength
  • Excellent mechanical strength and puncture resistance
CHO-THERM - High Power Thermally Conductive Electrical Insulator Pads
Unit of Measure
Items CHO-THERM - High Power Thermally Conductive Electrical Insulator Pads
T500
CHO-THERM® - High Power Thermally Conductive Electrical Insulator Pads 		CHO-THERM - High Power Thermally Conductive Electrical Insulator Pads
1678
CHO-THERM® - High Power Thermally Conductive Electrical Insulator Pads 		CHO-THERM - High Power Thermally Conductive Electrical Insulator Pads
1671
CHO-THERM® - High Power Thermally Conductive Electrical Insulator Pads
Color N/A Green N/A Pink N/A White
Reinforcement Carrier N/A Fiberglass
Test Method Thicknesses N/A ASTM D374
Thickness N/A 0.25 mm0.010 in N/A 0.25 mm0.010 in N/A 0.38 mm0.015 in
Thickness Tolerance N/A ± 0.050 mm± 0.002 in
Test Method Specific Gravity N/A ASTM D792
Specific Gravity N/A 1.60 N/A 1.55 N/A 1.55
Test Method Hardness N/A ASTM D2240
Hardness, Shore A N/A 80
Operating Temperature Range N/A –40 to 200 ºC–40 to 392 ºF
Test Method Thermal Impedance N/A ASTM D5470
Thermal Impedance N/A 1.2 ºC-cm²/W0.19 ºC-in²/W N/A 1.26 ºC-cm²/W0.20 ºC-in²/W N/A 1.48 ºC-cm²/W0.23 ºC-in²/W
Test Method Apparen Thermal Conductivity N/A ASTM D5470
Apparen Thermal Conductivity N/A 2.1 W/m·K N/A 2.0 W/m·K N/A 2.6 W/m·K
Test Method Heat Capacity N/A ASTM E1269
Heat Capacity N/A 1.0 J/g-ºC
Test Method Coefficient of Thermal Expansion N/A ASTM E831
Coefficient of Thermal Expansion N/A 250 ppm/K
Test Method Volume Resistivity Dry N/A ASTM D149
Volume Resistivity Dry N/A 1016 O/cm
Test Method Voltage Breakdown Dry N/A ASTM D149
Voltage Breakdown Dry N/A 4000 Vac N/A 2500 Vac N/A 4000 Vac
Test Method Tensile Strength N/A Chomerics
Tensile Strength N/A 20.7 MPa3000 psi
Test Method Tear Strength N/A Chomerics
Tear Strength N/A 70 kN/m400 lb/in N/A 35 kN/m200 lb/in N/A 70 kN/m400 lb/in
Test Method Elongation N/A Chomerics
Elongation N/A 20 % N/A 20 % N/A 15 %
Test Method Dielectric Constant N/A ASTM D150
Dielectric Constant at 1000 kHz N/A 3.5 N/A 3.6 N/A 3.6
Test Method Dissipation Factor N/A Chomerics Test
Dissipation Factor at 1000 kHz N/A 0.003 N/A 0.007 N/A 0.007
Test Method Flammability Rating N/A UL 94
Flammability Rating N/A V-0 N/A V-0 N/A HB
Test Method RoHS Compliant N/A Chomeric Certification
RoHS Compliant N/A Yes
Test Method Outgassing N/A ASTM E595
Outgassing TML N/A 0.40 % N/A 0.55 % N/A 0.76 %
Outgassing CVCM N/A 0.10 % N/A 0.12 % N/A 0.07 %
Test Method Shelf Life N/A Chomerics
Shelf Life, Months from Dry Pad N/A 24
Shelf Life, Months from Dry Pad with PSA N/A 18