Views: 0 Author: Site Editor Publish Time: 2026-05-11 Origin: Site
To control the compression rate of insulation thermal pads, there are actually three things to focus on: selecting the right thickness, controlling the locking pressure, and ensuring a smooth structure. It is very easy to implement in engineering, and I will give you a set of practical methods that can be directly used. Core principle: Compression ratio target: 20% to 30% (appropriate), with an upper limit of no more than 50%
1: Control with thickness, suggested thickness of thermal pad=assembly gap /(0.7-0.8)
That is to say:
Gap: 1.0mm → Select 1.3-1.5mm
Gap: 0.5mm → Select 0.6-0.8mm
Gap: 2.0mm → Select 2.5-3.0mm
When installed in this way, the compression rate naturally falls within the ideal range of 20% to 30%.
2: Control the pressure/force of the locking screw
Do not lock it, just lock it tightly to the radiator without shaking, to avoid deformation and slipping of the shell.
Standardize with a torque wrench, and if the locking torque of the same batch of products is consistent, the compression ratio will be stable.
Avoid local crushing, lock diagonally step by step, and do not lock one at a time.
When the pressure is stable, the compression rate becomes stable.
3: Limit (secure) in structural design
Design height limit posts on radiators or shells:
Limit column height=assembly gap
When locking the screw, press it to the limit post and stop
The compression ratio is forcibly controlled at the design value, without excessive compression
This is a reliable solution commonly used in vehicles, power supplies, and industrial control.
4: Choose a thermal pad that matches the hardness
Small gap, low pressure → Choose a softer point (easy to compress, ensuring fit)
Large gap, high pressure → Choose slightly harder (less prone to excessive collapse)
Under the same thickness and pressure:
The softer → the higher the compression ratio
The harder → the smaller the compression ratio
5: Ensure that the installation surface of the thermal pad is flat.
Radiators PCB, The chip surface is free of warping and burrs
Uniform force results in uniform compression rate
Otherwise, the local compression will be too large, and the local compression will not be tight enough
Quickly determine whether the control is in place
After installation, the radiator does not loosen or lift up
The edge of the thermal pad slightly overflows but does not bulge or crack
The temperature is normal and not too high
→ Compression rate control is qualified
Thermal pad controls compression rate=calculated thickness+standard locking+structural limit+selected hardness+flat installation
By achieving these points, the compression rate remains stable at 20% to 30%, and the thermal conductivity, insulation, and lifespan are all excellent.
