Material Selection
Three Thermal Interface Solutions for LED Lighting
The thermal interface material is positioned on the non-emitting side of the LED PCB or metal-core PCB, between the board and a metal housing or heat sink.
Thermal Grease
A thin thermal grease layer fills microscopic surface irregularities between the back of the LED PCB or MCPCB and an aluminum heat sink.
Typical fit: Best for close-fitting, mechanically secured assemblies.
Thermal Silicone Pads
Compressible silicone pads fill designed gaps between the back of the LED PCB and the aluminum housing or heat sink.
Typical fit: Suitable for controlled gap thickness and custom die-cut shapes.
Thermally Conductive Tape
Adhesive thermal tape bonds a suitable LED PCB or MCPCB to an aluminum profile while providing a heat-transfer interface.
Typical fit: Use where the adhesive bond meets mechanical and thermal requirements.
Where Our Materials Fit
Typical LED Lighting Applications
Illustrative lighting categories. Material choice depends on the mechanical gap, mounting method, heat load and qualification requirements.
LED Strip Lights
LED Linear Lights
LED Panel Lights
LED Downlights
LED High Bay Lights
LED Floodlights
Assembly Details
PCB-to-Heat-Sink Interface: Application Examples
Visual examples of material placement during assembly. Product photos are conceptual illustrations rather than verified customer production photographs.
Thermal Grease
Apply a thin, controlled layer to the metal mating surface or PCB backside, then assemble the LED board to the heat sink.
Thermal Pad
Place a correctly sized pad between the PCB backside and the heat sink, then compress within the pad specification.
Thermal Tape
Apply the tape to a clean mating surface, remove the liner and bond the board to the aluminum housing.
Final Assembly
The TIM remains inside the completed assembly, between the PCB and the heat-dissipating metal structure.
Engineering Guide
How to Choose the Right Material
| Material | Typical Interface | Selection Considerations | Assembly Approach |
|---|---|---|---|
| Thermal Grease | Very thin mating gaps | Contact pressure, pump-out, oil bleeding and application control | Dispense or spread on mating surface; secure PCB mechanically |
| Thermal Silicone Pad | Designed or uneven gaps | Thickness, compression, hardness, contact area and thermal resistance | Die-cut pad between board backside and heat sink |
| Thermal Tape | Bonded thin interfaces | Adhesion, substrate compatibility, bond line, temperature and long-term loading | Apply tape to cleaned mating surfaces and press to bond |
OPUTE Technical Support
Need a Thermal Interface Material for Your LED Lighting Project?
Share your LED PCB size, aluminum housing design, interface gap, operating temperature and assembly process. Our team can discuss suitable grease, pad or tape options and customization requirements.
Contact OPUTE