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Grey thermal grease paste in a 25g syringe tube

Ruth's sister

Ruth's sister Thermal Grease Paste 25g 4.8 W/m.K

SKU CH-WH4H-CY3BZ

High-performance thermal grease with 4.86 W/m.K conductivity for CPU and GPU cooling, supplied in a 25 g syringe

  • High thermal conductivity of 4.86 W/m.K for efficient heat transfer
  • Low viscosity compound ensures easy, even application on CPU and GPU
  • Operating range from -30 °C to 280 °C suits demanding workloads
  • 25 g syringe provides enough paste for multiple installations
  • Electrical isolation protects circuits while conducting heat

High-conductivity thermal paste for processors

This 25 g syringe delivers a thermal conductivity above 4.86 W/m·K, making it suitable for CPUs, GPUs and IGBT modules. The grey nano-compound uses a low-viscosity silicone base that spreads easily and maintains performance from –30 °C to 280 °C. It provides electrical isolation while filling microscopic gaps between the die and cooler.

Practical limits of silicone-based compounds

Silicone grease can pump out over many thermal cycles, gradually increasing thermal resistance. The material is non-curing, so it will not bond the heatsink permanently, but it may require re-application after several years of heavy use. Conductivity above 4.8 W/m·K is near the ceiling for non-metallic pastes, so gains beyond this point demand liquid metal or phase-change pads.

Check your mounting pressure and surface flatness

Ensure the cooler applies even pressure across the entire die; uneven contact traps air pockets that no paste can bridge. Verify that both the processor lid and heatsink base are clean, flat and free of old compound residue before applying. The 25 g volume covers multiple applications, but a pea-sized dot is usually sufficient for a standard desktop CPU.

Highlights

  • High thermal conductivity of 4.86 W/m.K for efficient heat transfer
  • Low viscosity compound ensures easy, even application on CPU and GPU
  • Operating range from -30 °C to 280 °C suits demanding workloads
  • 25 g syringe provides enough paste for multiple installations
  • Electrical isolation protects circuits while conducting heat

Specifications

No published specifications for this item yet.

Questions about this item

How do I decide between the 25g tube and a larger size?

The 25g tube covers several CPU or GPU applications; choose a larger container only if you service many systems regularly.

What does the 4.8 W/m.K thermal conductivity mean once the paste is on the CPU?

It indicates the paste can move heat from the die to the cooler efficiently, helping keep temperatures lower under load.

What interface or standard does this grease follow and what does it limit in practice?

It is a non-conductive silicone compound rated for -30 to 280 °C, so it remains stable across the full operating range of modern processors.

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