Wax Melt Temperature Indicator Label Technology

The most common application associated with wax melt temperature indicating technology is self adhesive labels that 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 of attained temperature. Typically used in the industrial setting.

How the labels work:

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 usually black.  When the rated temperature is exceeded, the chemical melts and is absorbed by the substrate, causing a permanent color change to black.  Up to ten elements can be combined together on a single label.

Typical Label Construction:

Above values are general guides for illustration purposes only.

Process Temperature Indicator		Recoding Dishwasher Surface Temperature