Thermal paste QOLTEC 51640 — heat sink compound, generic thermal interface material

QOLTEC 51640 is a thermal paste formulated as a thermal interface material to improve heat transfer between electronic components and heatsinks. It fills microscopic gaps and surface irregularities between processors, GPUs, power devices and cooling bases to reduce thermal resistance and support stable temperature control during operation.

Advantages

The compound combines efficient thermal conductivity with electrical insulation, allowing safe use around sensitive circuits. It spreads easily and adheres well to metal and ceramic surfaces, enabling consistent thermal contact without frequent reapplication. The formulation maintains its performance over extended use and resists drying or degradation under normal operating conditions.

Suitable for

• CPU and GPU cooling in desktop and laptop systems
• Power electronics and MOSFET cooling assemblies
• Heat sinks, cold plates and thermally conductive gaps in compact devices
• Replacement or maintenance of thermal interfaces in servers and workstations

Key specifications

• Form: paste / compound designed for thermal interface application
• Thermal behavior: high thermal conductivity to improve heat transfer
• Electrical properties: electrically insulating to reduce risk of short circuits
• Compatibility: suitable for metal and ceramic heatsink surfaces and electronic package interfaces
• Application properties: easy to spread with good adhesion, long-lasting without rapid drying

How to use

Clean both surfaces to be joined from old paste, dust and oils using an appropriate solvent and lint-free cloth. Apply a small, even amount of QOLTEC 51640 to the center of the component surface or as a thin bead and mount the heatsink, allowing the compound to spread under pressure to fill micro-gaps. Avoid applying excessive amounts; a thin continuous layer provides optimal thermal transfer. Reassemble the device following manufacturer torque and mounting instructions.

Usage recommendations

For best results, use the thermal paste at room temperature and ensure component surfaces are flat and clean. Recheck thermal performance after initial run-in and during periodic maintenance; replace the paste only if thermal resistance increases noticeably. Avoid contact with exposed electrical contacts and connectors despite the insulating properties, and follow safe handling guidelines for small amounts of thermal compound.