Thermochromic Paint

Question: I need some help.

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I need some help. I am looking for a thermochromic paint that is reversible and has high-temperature capability. The only product I have found is low-temperature, 59 to 131F for color change, and an upper temperature limit of 300 to 350F. I need a paint that will color change at 140 to 170F and can survive 850 to 950F for 10-hr periods and still reverse color after 500 to 800 cycles.

I had a sample 6 to 7 years ago that would change from red to black and survive on a 1,000F vitreous surface. Has anyone out there any information on such a product? F.S.


As I understand them, thermochromic paints are coating materials having organic binders and pigments capable of reversible color changes at specific temperatures. It is the pigments that are thermochromic.

You are having difficulties finding paints that can survive temperatures of 850 to 950F for 10-hr periods because most organic materials decompose at lower temperatures. Even if these materials don’t decompose, they will darken after 500 to 800 cycles at 850 to 950F to the point that you won’t be able to see the color, let alone the change. The only thing I can suggest is to use a low-temperature ceramic coating. Perhaps one of our readers can help. If so, I will forward the comments.

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