Thermal Insulating Pads

Henkel Gap Pad

Parker Chomerics' Thermal Insulating Pads

Select the product name to access its datasheet.


Cho-Therm: thermally conductive electrical insulator pads are designed for use where the highest possible thermal, dielectric, and mechanical properties are required. These products are designed for use as alternatives to greased mica insulators between discrete power devices and heat sinks, offered as dry pads or with an optional acrylic adhesive (PSA) layer for attachment.

Key Attributes

  • Excellent mechanical strength and puncture resistance

  • Available with & without acrylic PSA

  • UL recognized V-0 flammability rating

Commercial grade:

  • Good thermal properties

  • Good to excellent dielectric strength

  • Available on continuous rolls for easy peel and stick application

High power demand requirements:

  • Excellent thermal properties

  • High dielectric strength

  • 100% inspected for dielectric properties on every sheet

  • Extremely low NASA outgassing

  • Proven through decades of use in demanding military and aerospace applications

A user-friendly insulator between discrete power devices and heat sinks; conducting very large heat loads and maintaining electrical insulation between heat sinks and components.



  • Power conversion equipment

  • Power supplies & UPS

  • Power semiconductors

  • Automotive electronics

  • Motor and engine controllers

  • Televisions and consumer electronics

Frequently Asked Questions

What is the output of ASTM D5470 thermal conductivity test?

Parker Chomerics use ASTM D5470 their standard performance test method. This measures thermal impedance (resistance) of a flat disk-shaped specimen or controlled volume of a liquid thermal interface material (TIM) between two flat polished calorimeter surfaces under controlled load.

Is there a recommended surface roughness?

Is there a recommended surface roughness?

As a general rule, increased surface roughness will create a larger surface area available for wetting. For vertical applications, increased surface roughness will provide a greater resistance to slide. Generally, increasing the shot size, contact area and surface roughness will aid in slide resistance of the material. Surface roughness of N8 or rougher is recommended.

What materials do you recommend where applications require thin bondline thickness from a thermally conductive material?

This type of application would require a smooth/flat surface roughness. For this we recommend Ablefilm, ​Thermattach tapes, Cho-Therm, thermal greases or pastes/gels.