Thermal paste SilentiumPC Polartherm X-8 — 2 g, density 2.6 g/cm³, aluminium oxide/silicone/zinc oxide

SilentiumPC Polartherm X-8 is a 2 g thermal interface compound formulated from aluminium oxide, silicone and zinc oxide with a density of 2.6 g/cm³. Supplied in a single 2 g pack, this thermal paste fills microscopic gaps between the CPU or GPU heat spreader and the heatsink base to improve heat transfer and reduce operating temperatures. The silicone-oil carrier and oxide powders create a medium-viscosity compound suitable for air and liquid cooling solutions and for routine maintenance or upgrades.

Advantages

Polartherm X-8 offers a balance of thermal conductivity and ease of application. Its formulation provides effective heat transfer while remaining simple to spread or dispense, and it is designed to resist typical pump-out effects over time. The 2 g size is convenient for single-system applications such as CPU or GPU reseating, and the compound is supplied with applicators to support multiple application methods.

Suitable for

• Applying or replacing thermal paste on desktop CPUs
• Thermal interface work on discrete GPUs or small graphics modules
• Maintaining or upgrading air or liquid CPU coolers
• Repair tasks and one-off PC builds or component swaps

Key specifications

• Mass: 2 g
• Density: 2.6 g/cm³
• Main ingredients: aluminium oxide, silicone (silicone oil carrier), zinc oxide
• Intended use: thermal interface compound for CPUs, GPUs and heatsinks
• Color: white
• Includes applicator tools for direct, spatula or applicator-tip application

How to use

Prepare the surfaces by removing the old thermal paste from the CPU/GPU heat spreader and heatsink base using an appropriate cleaner and lint-free cloth. Apply a small amount of Polartherm X-8 to the center of the heat spreader or use the included applicator or spatula to spread a thin, even layer across the surface. Mount the cooler and tighten mounting hardware following the manufacturer's instructions so that the paste is compressed to fill microscopic gaps. Allow the system to run through a few thermal cycles and verify temperatures to ensure a correct application.

Usage recommendations

For best results, use a thin, even layer of paste rather than a large quantity. Replace the thermal paste if you observe steadily rising temperatures, visible drying or separation of the compound, or after major component swaps. Store the tube in a cool, dry place and keep the cap closed to prevent contamination and drying out.