TIMCool FAQs

Test Data indicates that the minimum shelf life is three months for all variants with adhesives. TIMCool without adhesives are expected to last many years. While testing continues, our expectations are that the TIMCool shelf life is more than two years at room temperature. The material should be kept out of direct sunlight and remain in the packaging until use.

It has passed HAST testing at 85°C and 85% Rh up to 500 hours. It has also passed temperature cyclcompreing between -40 and +125°C for 1000 cycles. It has passed aging tests at 120°C up to 1000 hours. The thermal resistance does not increase more than 15% during the entire test periods.

TIMCool passed 10 minutes at 260°C with 3 times reflow profile. It has passed the temperature profile 150°C, 180°C and 260°C, 180°C and 150°C profiles with each hold time at 5 minutes. After multiple excursions the thermal resistance does not change more than 30%

Store TIMCool in its original packaging and at a normal room temperature and humidity. Please keep away from direct sunlight.

TIMCool has extreme thermal conductivity thanks to the vertically aligned graphene. The material is very soft and flexible.

TIMCool is electrically conductive. There are options to make the material electrically isolative. Ask your sales representative for more information.

Please follow the manual included with the shipment. If you need another copy of it. Please contact info@hi-rel.com

Yes, you can cut most of our pads to size. For more information, please reference the instruction manual on handling the material.

Please contact your representative or email us at: info@hi-rel.com.

This depends on which TIMCool variant you use and what size it is. In general, we can make most pads between 200µm-500µm (.200" - .020"), but thinner and thicker options are available.

This depends on which TIMCool variant you use and what thickness it is. In general, we can make most pads between 5x5mm and 80x80mm (.200" square and approx. 3.200" square).

No, the thermal conductivity is optimized along the vertical axis and one horizontal axis. The other horizontal direction has approx. 10% the thermal conductivity of the optimized direction. You can identify the horizontal axes visually by means of the stripes that appear on the TimCool. The optimized thermal conductivity aligns with the direction of the dark/ graphene stripes.


The hardness depends on the TIMCool variant, and the thickness of the pad. TimCool becomes less soft as a result of the graphene thickness basically reinforcing itself. In general the TIMCool70PRO is the softest followed by the TIMCool90SOFT and TIMCool90PRO.

The compressibility depends on the TIMCoool variant and the thickness of the pad. Thicker pads become more difficult to compress as the graphene reinforces itself. A 200µ(.008")thick TIMCool90 can be compressed approx. 80% before breakdown begins to occur.

Depending on type we recommend 20psi/140kPa or above to get good thermal contact. As with all thermal interface materials, the higher the pressure, the better the thermal contact.

Outside lab testing indicates that there is no significant degradation up to 1 KW output up to a two thousand cycles. Our internal mechanical cycling tests up to 5000 cycles up to 120 psi does not degrade the materials thermal performance.

The data shows that TIMCool is stable in hydrocarbon and fluorocarbon liquid. The resistance change is not more than 15% maximum after one month immersion.

TIMCool (all variants)pass the VL90 testing.

By coating the TIMCool we can protect against FPM depending on the value of the external pressure. Note that the thermal impedance may vary.

Coating of TIMCool can protect against tearing. Note that the coating can be added to both sides of the TIMCool substrate if needed.