Temperature-Indicating Paint

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Temperature-Indicating Paint

 

a paint containing various chemical compounds that are capable of changing color at a certain temperature. The change may occur, for example, as a result of breakdown of a heat-sensitive compound, such as ferric hydroxide or cadmium carbonate, or the formation of a new compound as a consequence of the reaction of the temperature-indicating components of the paint—for example, the formation of lead sulfide from thiourea and lead tetroxide. A distinction is made between reversible paints, which can repeatedly return to their original color, and irreversible paints.

Temperature-indicating paints, which are produced in the form of pastes or sticks, can be used to measure temperatures in the range from 35° to 1600°C, with an accuracy of ±0.5° to ±10°C. They are used in cases in which the use of the usual means of thermometry is difficult or impossible.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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This, as well as temperature-indicating paint, showed that the TiN coating, only 2-4 microns thick, has no effect on the mold-surface temperature.
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