How Do You Apply Thermal Relief Pads?

Here are the basic steps to apply a thermal relief pad:

1. Clean the surfaces - Make sure the surfaces where the pad will be applied are clean, dry and free of debris. This ensures the best adhesion.

   
   

2. Cut the pad to size - Measure and carefully cut the thermal conductive pad to fit the desired area. Typical areas are under CPUs, GPUs, voltage regulators, etc. Avoid overhangs.

   
   

3. Remove the protective film – If the thermal pad has a protective liner, remove it carefully without touching or contaminating the contact surface.

   
   

4. Position the thermal pad – Place the pad over the intended contact area and make sure it lies flat without wrinkles, folds or misalignment.

   
   

5. Apply heat sink/component - Place the heat generating component (e.g. CPU) or heat sink directly onto the exposed side of the thermal pad.

   
   

6. Apply mounting pressure - Screw down or clamp the heat sink/component with the required mounting pressure per thermal pad supplier specs.

   
   

7. Check for air bubbles - Inspect for any air bubbles trapped between surfaces. Squeeze out gently if needed.

   
   

8. Allow curing time - Some thermal pads require curing time before full operation. Check datasheet for recommendations.

   
   

9. Reinstall case/covers - Replace any case panels or covers after ensuring proper pad placement and mounting pressure.

Good thermal pad installation comes down to three things: clean contact surfaces, the right pad thickness and even mounting pressure. Before closing the assembly, check that the pad covers the contact area properly and has not shifted, folded or left a visible gap.

If you are selecting a thermal pad for heat sink applications, AOK offers thermal pads in different thicknesses, hardness levels and thermal conductivity options, with custom sizes and die-cut shapes available for different component layouts.