Thermal Grizzly TG Metal Polish vs Copper Polish
Thermal Grizzly TG Metal Polish and Copper Polish are two different surface preparation compounds: TG Metal Polish is a general-purpose abrasive paste for smoothing IHS and cold plate surfaces, while Copper Polish is specifically formulated for bare copper surfaces to remove oxidation and create a mirror finish. Both reduce surface roughness to improve thermal contact, but they differ in intended use, abrasiveness, and application technique. This article explains the differences, how each works, and which one you should choose for your PC cooling setup.
Background: Why Polish a CPU or Cooler?
Thermal interface material (TIM) performance depends on the microscopic contact between the CPU heat spreader (IHS) and the cooler base. Even a “flat” surface has tiny peaks and valleys. Thermal paste fills those gaps, but a smoother surface reduces the amount of paste needed and improves heat transfer. Polishing removes machining marks, scratches, and oxidation. Thermal Grizzly offers two compounds for this task: TG Metal Polish and Copper Polish. The names are similar but the formulas are not interchangeable.
What Is TG Metal Polish?
TG Metal Polish is a multi-metal abrasive paste. It is designed for use on nickel-plated copper (the typical IHS material), as well as bare copper, aluminum, and steel. It contains fine aluminum oxide or similar abrasive particles suspended in a carrier. You apply it with a soft cloth or felt pad, rub in a circular or figure-eight motion, and it gradually removes a thin layer of metal. The result is a smoother, more reflective surface. It is not a chemical cleaner; it works by mechanical abrasion.
What Is Copper Polish?
Copper Polish is a specialized compound for bare copper surfaces. Copper oxidizes quickly, forming a dull brown or green patina. That oxide layer acts as an insulator, hurting thermal transfer. Copper Polish is formulated to remove oxidation and minor scratches from copper without being overly aggressive. It often contains a mild chemical agent (like a weak acid or chelating agent) that dissolves copper oxide, plus a fine abrasive to smooth the surface. It is not recommended for nickel-plated surfaces because it can wear through the thin nickel layer.
How to Choose Between Them
Your choice depends on the material you are polishing:
- Nickel-plated IHS (most modern CPUs): Use TG Metal Polish. It is gentle enough to not damage the plating.
- Bare copper cooler base or water block: Use Copper Polish. It handles oxidation better and is safe on raw copper.
- Aluminum or steel: Use TG Metal Polish. Copper Polish is not suitable for those metals.
If you are unsure what your cooler base is made of, check the manufacturer’s spec. Most aftermarket coolers use nickel-plated copper or bare copper. If it is bare copper and has turned dark, Copper Polish is the right tool.
Step-by-Step Polishing Guide
Whichever polish you choose, the process is similar:
- Remove the CPU or cooler from the system. Clean off old thermal paste with isopropyl alcohol (90% or higher).
- Apply a small amount of polish (about the size of a pea) to a lint-free cloth or felt pad.
- Rub in a circular motion with moderate pressure. Do not press too hard; let the abrasive do the work.
- Continue for 1-3 minutes, checking progress. You should see a bright, even reflection.
- Wipe off the polish residue with a clean cloth.
- Clean the surface again with isopropyl alcohol to remove any remaining compound.
- Reinstall with fresh thermal paste.
Do not polish too often. Removing metal changes the flatness and can reduce contact pressure. One or two sessions are enough for most builds.
Common Problems and Misconceptions
A frequent mistake is using Copper Polish on a nickel-plated IHS. The chemical agents can strip the plating, exposing bare copper, which then oxidizes and worsens thermal performance over time. Another misconception is that polishing guarantees lower temperatures. In practice, the improvement is often 1-3°C at most, and only if the original surface was rough. If your temperatures are high, check mounting pressure and paste application first. Also, some users polish too aggressively, creating a concave surface that traps air and hurts contact. Always use light pressure and check flatness with a straightedge if possible.
Safety and Precautions
Both polishes contain fine abrasives and possibly chemicals. Wear gloves to avoid skin irritation. Work in a well-ventilated area. Keep the compounds away from electrical components; if any gets on a circuit board, clean it immediately with isopropyl alcohol. Do not ingest. Dispose of used cloths properly. Never polish a CPU while it is installed in the motherboard, as abrasive particles can get into the socket.
Alternatives to Polishing
If you do not want to polish, you can still improve thermal contact:
- Use a high-quality thermal paste: Modern pastes fill small imperfections well.
- Use a lapping kit: Lapping uses progressively finer sandpaper (e.g., 400 to 2000 grit) to flatten and smooth the surface. It is more aggressive than polishing but yields a flatter result.
- Use a thermal pad or liquid metal: Liquid metal can fill gaps, but it is conductive and risky. Thermal pads are safe but less effective.
- Ensure proper mounting pressure: An even, firm mount often matters more than surface finish.
Frequently Asked Questions
Can I use Copper Polish on a nickel-plated CPU?
No. Copper Polish is formulated for bare copper. On nickel plating, it can wear through the thin layer, exposing copper that will oxidize and hurt performance. Use TG Metal Polish instead.
How often should I polish my CPU or cooler?
Only when you notice poor thermal performance or visible oxidation. Polishing removes metal, so doing it repeatedly can change the surface geometry. Once or twice over the life of the hardware is typical.
Does polishing void my warranty?
It can. Many manufacturers consider polishing or lapping a modification that voids the warranty. Check your product’s warranty terms before proceeding. If in doubt, do not polish.
What is the difference between polishing and lapping?
Lapping uses flat abrasive sheets (sandpaper) on a flat surface to remove high spots and create a perfectly flat plane. Polishing uses a soft cloth and abrasive paste to smooth the surface without necessarily flattening it. Lapping is more aggressive and can fix a convex or concave base; polishing only removes micro-scratches.
Will polishing improve my temperatures significantly?
Usually not. Most modern coolers and CPUs come with a reasonably smooth surface. Polishing may improve temperatures by 1-3°C at best. If you have a poorly machined base or heavy oxidation, the improvement can be larger, but for most users the effort is not worth the risk.
Related
Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.