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Grey thermal paste syringe 3.5g with plastic spatula

Alphacool

Alphacool Subzero Thermal Paste 3.5g 16 W/mK Grey

SKU CH-QXMF-YPF3K

High-performance thermal compound with 16 W/mK conductivity, 3.5 g syringe and included spatula for precise CPU application

  • Details3.5g
  • Key featuresAlphacool's Subzero Thermal grease - when performance and ea
  • High thermal conductivity 16 W/mK for efficient heat transfer
  • Optimal viscosity 850000 TF enables smooth, even spreading
  • Non-electrically conductive formula prevents short-circuit risk
  • 5 g syringe with screw-on cap resists drying out
  • Includes plastic spatula for precise, thin-layer application

High-performance thermal grease 16 W/mK

Alphacool Subzero is a high-performance thermal compound rated at 16 W/mK thermal conductivity and supplied in a 3.5 g syringe. The grey paste has a density of 2.7 g/cm³ and a viscosity of 850000 TF that makes it slightly more fluid than many alternatives. It is non-electrically conductive so accidental contact with components is unlikely to cause damage.

Practical limits of the paste interface

Thermal paste can only fill microscopic gaps between the CPU heat spreader and the cooler base; it cannot compensate for poor mounting pressure, warped surfaces or an undersized cooler. The 16 W/mK rating represents the material's intrinsic conductivity, not the final junction temperature which also depends on cooler capacity and case airflow. The 3.5 g volume is enough for several applications but will not last for frequent re-pasting of large server arrays.

Easy installation with included spatula

The syringe features a screw-on cap that prevents the compound from drying out between uses, and a plastic spatula is included for spreading a thin, even layer across the entire CPU surface. The lower viscosity helps the paste flow into micro-voids without excessive force, but users must still avoid applying too much material which can pump out under thermal cycling. Clean surfaces thoroughly before application for best results.

How it compares

Measured against everything we stock in Thermal Paste, at today’s prices. Recalculated every night.

Price $11.99
Cheaper than about 55% of the 498 comparable items (median $12.99).

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Specifications

Product
Brand nameAlphacool
Model name1020151
Part number1020151

Questions about this item

The 3.5 g syringe is the only size listed — will that cover multiple CPU applications?

The 3.5 g tube typically covers several standard CPU installs; apply a thin layer across the whole heat-spreader each time and reseal the screw-on lid to prevent the 850 000 TF viscosity paste from drying out.

What does the 16 W/mK conductivity figure mean once the paste is between a CPU and cooler?

The 16 W/mK rating indicates very high heat-transfer capability, helping move thermal energy from the die to the cold plate more efficiently than lower-conductivity compounds in high-end systems.

The paste is non-electrically-conductive — does that remove all risk if it spreads onto the motherboard?

Because the compound is not electrically conductive, accidental contact with PCB traces or pins is highly unlikely to cause short-circuit damage, though careful application with the included spatula is still advised.

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