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Irreversible Temperature Recording Labels

A series of temperature test inidcators that will permanently record the highest temperature reached by the label.

These self-adhesive labels consist of a series of temperature-sensitive elements sealed between heat-resistant substrates with transparent windows. Each element changes color distinctly as its rated temperature is exceeded. The changes are irreversible, providing a temperature history of the surface being monitored. The labels will not de-laminate when removed for reference and can be attached to an inspection report to serve as a permanent record.

The temperature-sensitive elements are phase-change indicators which use the sharply defined melting points of a series of specially purified organic chemicals to give the unique, high precision, color change effects. Each temperature element uses a different chemical compound and is made separately by applying a coating containing the chemical to a special absorptive paper substrate. When the rated temperature is exceeded, the chemical melts and is absorbed by the substrate, causing a permanent color change. Up to ten elements can be combined together on a single label.



Process Control, Test & Measurement, Manufacturing, Automotive, Rail, Quality Control, Safety Indicators, Aerospace, Food, Warranty, Maintenance, Medical, Drilling


Case Studies

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Temperature Range: 84°F to 554°F | 29°C to 290°C

Accuracy: Less than 212°F is ±2°F | Less than 100°C is ±1°C
212°F to 309°F is ±3°F | 100°C to 154°C is ±1.5°C
Greater than 309°F is ±7°F | Greater than 154°C is ±4°C

Silver to Black Color Change: Below 399°F | Below 204°C

Orange to Black Color Change: Above 410°F | Above 210°C

Last Black Event is the Highest Temperature Achieved



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