How to Make Homemade Thermal Grease

Written by lee nichols
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How to Make Homemade Thermal Grease
Thermal grease helps prevent your computer from running too hot. (HOT Technology and Food image by Christopher Meder from

Thermal grease is a compound that computer technicians use to help keep a computer processing unit cool. Air pockets form beneath heatsinks and video cards when they are installed in a processor; thermal grease fills the air pockets and increases thermal conductivity. Arctic Silver, Cool Laboratory and Shin-Etsu produce commercial thermal grease products, but you can make your own grease if you do not have a commercial product on hand. You should replace homemade thermal grease as soon as possible because the ingredients will break down and lessen its effectiveness.

Skill level:

Things you need

  • No-grit toothpaste
  • Petroleum jelly
  • Bowl
  • Toothpick or spoon
  • Syringe
  • 5 grams diamond powder
  • 4 grams silicon grease
  • Zip-lock plastic bag
  • Dust mask
  • Syringe

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  1. 1

    Put toothpaste and petroleum jelly in a small bowl. Use a ratio of 75 per cent toothpaste to 25 per cent petroleum jelly. Use no-grit toothpaste because grit will interfere with heat transfer.

  2. 2

    Mix the toothpaste and petroleum jelly with a toothpick. If you are making a large amount of grease, mix the ingredients with a spoon.

  3. 3

    Fill a syringe with the mixture for ease of application.

  1. 1

    Put on a dust mask. Diamond dust is extremely dangerous if you inhale it, so always where breathing protection when working with it.

  2. 2

    Put the diamond dust and silicone grease in a plastic bag. Close the bag tightly.

  3. 3

    Mix the ingredients thoroughly by mashing on the bag with your fingers. Mix the compound until it is gooey, almost runny, but still holds its shape.

  4. 4

    Put the compound in a syringe for application and storage.

Tips and warnings

  • Craft and hobby stores sell silicone grease.
  • You can purchase diamond powder on eBay; powder that is made from 25-carat diamonds works best.
  • Use a clean syringe, because any debris in the syringe can affect paste's heat conduction.
  • Do not buy silicone grease that contains zinc-oxide. Zinc-oxide will weaken the diamond powder's conductivity.
  • Store leftover diamond powder in a safe place, away from children.
  • Applying homemade thermal grease can void the warranty on your computer.

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