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Thermal Gap Pads (TGPs) provide high thermal performance with ease of use for many applications. Ultra-high compressibility enables low stress and excellent conformity to mating surfaces. Honeywell Thermal gap pad models are naturally tacky, and require no additional adhesive which could inhibit thermal performance.
TGP models provide thermal performance with ease of use across a multitude of applications. They have been designed to minimize thermal resistance at interfaces, and maintain effective performance through reliability testing. TGP models are silicone based, therefore they offer a certain anti-shock effect, with electrical isolation and non-flammability.
A range of thicknesses from 0.5mm to 5.0mm are available. Honeywell TGP models come with two surface liners, which enable users to remove the liner after installation (before operation), with no contaminant risk and easier handling.
TGP model thermal gap pads are available in standard sheets and also custom die-cut parts, and in a range of thicknesses. It is very important to understand that the applied pressure will directly affect the bondline thickness and the thermal impedance values
Thickness Range: 0.5-5.0mm with 0.25mm incremental
Thickness Tolerance: >1mm, ±10% 0.5-1mm, ±0.1mm
Gap filler is a Thermal interface material that exists between heat dissipating and heat generating surfaces and takes up the tolerance variation.It is silicon based, filled with TC fillers such as Bn,Zn and Alumina and comes in sheet (gap pad) or dispensable (putty) form.
Surprisingly enough there are no set test methods to control bleeding of Thermal gap pads. As a general rule of thumb there's NO thermal gap pad in the industry right now that doesn't bleed.
Silicone pads can and will bleed given the right circumstances, regardless of manufacturer. That doesn't mean that Silicone free pads are not prone to it. Silicone free pads will also bleed. They will just not bleed Silicone.
Bleeding is different than outgassing. It concerns longer molecular chains and it depends on a variety of parameters.
Bleeding depends on the pressure differential on the pad, how much free (not cross linked) silicone remains and the molecular weight (length) of the remaining unlinked chains. In this case, pressure playes a much bigger role than heat and orientation.
While bleeding tests are not standardized, Dielectric strength testing is quite straigtforward. The sample is placed between two 25 x 25mm Copper electrodes in ambient temperature and 65% ambient relative humidity while the voltage is raised by 0.1kV/s until the AC current crosses through.Optically, this cross through is usually in a form of a pinch/hole in the material, sometimes invisbile tothe bare eye.
Test are being conducted in a Dielectric strength tester - HJC-10KV at the time of writing of this content.