Question 1

What are thermally conductive silicone foils and how do they work?

Accepted Answer

Thermally conductive silicone foils are thin, flexible thermal interface materials placed between heat source and heat sink. Under compression they conform to contact surface irregularities, minimise the total thermal resistance and simultaneously provide permanent electrical insulation — making them the standard solution for planar component-to-heatsink interfaces.

Question 2

What is the difference between a thermally conductive foil and a gap filler?

Accepted Answer

Thermally conductive foils are significantly thinner (0.08–1 mm) and suited for planar surfaces with tight tolerances. Gap fillers (up to 10 mm) are used when larger gaps or height differences between components need to be bridged. Foils offer a more consistent bondline thickness and are easier to handle in automated assembly.

Question 3

What thermal conductivity do HALA silicone foils achieve?

Accepted Answer

HALA silicone foils achieve thermal conductivities up to 8 W/mK. For higher thermal conductivities up to 20 W/mK, silicone gap fillers are the right choice. For anisotropic lateral heat spreading up to 1,950 W/mK, graphite foils are the solution.

Question 4

What is an insulating film with silicone coating?

Accepted Answer

An insulating film such as polyimide (Kapton) coated with thermally conductive silicone combines high electrical breakdown resistance with active thermal conduction. This makes it ideal for direct substrate-to-heatsink bonding in high-voltage power modules and power converters where standard silicone foils do not meet the required dielectric strength.

Question 5

Are thermally conductive foils available as custom die-cut parts?

Accepted Answer

Yes. HALA supplies silicone foils and films as sheets, rolls, loose die-cut parts and kiss-cut parts — with or without adhesive coating, fibreglass reinforced or with polyimide reinforcement. Custom shapes are produced in HALA's own production facility.

SILICONE FOILS AND FILMS

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