Thermal compound QOLTEC 51631 — heat sink paste for CPU/GPU cooling

QOLTEC 51631 is a thermal compound formulated to improve heat transfer between CPUs or GPUs and their cooling systems. As a paste-based interface material, it fills microscopic gaps and surface imperfections between the processor heat spreader and heatsink base to promote efficient thermal conduction and help maintain stable operating temperatures in desktop PCs and laptops. The compound combines thermal conductivity with electrical insulation and is designed for straightforward application and long-term use without frequent replacement.

Advantages

The thermal paste offers high thermal conductivity while providing electrical insulation, reducing the risk of short circuits in tight component layouts. Its consistency allows it to perfectly fill micro-gaps and surface irregularities for consistent contact between the chip and heatsink. The formula is easy to apply and spread, and remains stable over time so it does not dry out or degrade quickly under normal operating conditions.

Suitable for

• Desktop CPU cooling during builds, upgrades or maintenance
• GPU cooling and replacement of old thermal material
• Cooling solutions in small form-factor PCs and embedded systems
• Repair shops and technicians performing thermal interface replacement

Key specifications

• Form: paste
• Primary function: thermal interface material for processors and heatsinks
• Thermal properties: high thermal conductivity combined with electrical insulation
• Application: manual spread or pressure-based seating between heat spreader and heatsink
• Durability: formulated for long-term stability without rapid drying or loss of properties

How to use

Clean both the processor heat spreader and the heatsink base from old compound, dust and oils using isopropyl alcohol and a lint-free cloth. Apply a small pea-sized amount of QOLTEC 51631 to the centre of the CPU or evenly along the GPU die, then mount and secure the heatsink according to the cooler manufacturer’s instructions. The mounting pressure will spread the paste to form a thin, uniform thermal interface. If needed, gently spread the paste with a suitable applicator before mounting to ensure coverage without excess overflow.

Usage recommendations

Use a minimal, even quantity to avoid excess compound that could reduce thermal transfer. Replace the thermal paste when removing or reseating the cooler, or if thermal performance shows noticeable degradation. Store the product in a cool, dry place and keep the cap tightly closed to preserve consistency.