Thermal paste QOLTEC 51639 — heat sink compound, general-purpose thermal interface material

QOLTEC 51639 thermal paste is a general-purpose heat sink compound formulated to improve heat transfer between electronic components and cooling solutions. Designed for use between CPUs, GPUs, power semiconductors and their heatsinks or coolers, this thermal interface material fills microscopic gaps and surface imperfections to lower thermal resistance and support more efficient cooling in computers and electronic devices.

Advantages

The compound combines efficient thermal conductivity with strong electrical insulation, allowing safe use on components where dielectric properties are important. It spreads easily to create a thin, uniform layer that enhances thermal contact without requiring frequent reapplication. Its stability over time means the paste retains thermal performance and does not degrade quickly under normal operating conditions.

Suitable for

• Thermal coupling between CPUs or laptop processors and heatsinks
• GPU-to-heatsink interfaces in desktop graphics cards
• Power semiconductors and MOSFETs in power supplies or motor controllers
• Small electronic modules or LED assemblies requiring improved heat dissipation

Key specifications

• Type: general-purpose thermal interface material
• Thermal performance: high thermal conductivity
• Electrical behavior: electrically insulating
• Application form: spreadable paste for manual application
• Durability: stable properties over extended use

How to use

Clean contact surfaces thoroughly to remove old paste, dust and oils using isopropyl alcohol or a suitable cleaner, then allow surfaces to dry. Apply a small, pea-sized amount of QOLTEC 51639 to the center of the component die or use a thin, even layer for larger surfaces. Mount the heatsink and secure it with even pressure so the paste spreads to fill micro-gaps. If disassembly is required later, clean both surfaces and reapply fresh paste before remounting.

Usage recommendations

For best results, avoid excessive application which can increase thermal resistance; a thin, even layer provides optimal heat transfer. Ensure compatibility with your cooling solution and observe safe handling practices: keep the compound away from connectors and bare contacts despite its insulating properties, and store the product in a cool, dry place.