Dye in chemical temperature indicating device

Details Dye in chemical temperature indicating device Dye in chemical temperature indicating device

G - Physics

01

K

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G01K 11/08 (2006.01) C09B 69/00 (2006.01) C09K 5/06 (2006.01) C09K 9/02 (2006.01) G01K 11/06 (2006.01) G01K 11/16 (2006.01)

Patent

CA 1109287

DYE IN CHEMICAL TEMPERATURE INDICATING DEVICE ABSTRACT There is provided a temperature indicating device such as a disposable thermometer. The thermometer includes a thermally conductive sheet as a carrier layer having one or more cavities formed by depressions in the sheet material. At least one of the cavities is filled with a solid mixture which melts at a pre- determined temperature. The mixture includes the combination of ortho-chloronitrobenzene, ortho-bromonitrobenzene and a dyestuff. An indicator layer of absorbent material is superimposed on the solid mixture, and a transparent cover layer seals the cavities and their contents.

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