ColorChange

Wax Melt

Wax Melt Temperature Indicator Label Technology

permanent_record_attained_temperatureThe 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:

wax_melt_label_construction_illustration
Component:
Thickness
Print foil
>10µ
Melinex Polyester film (171ºC and below)
50µ
Kaladex film (177°C to 204°C)
50µ
Kapton Polyimide film (210¼C and above)
50µ
Adhesive & carrier (without liner)
75 - 85µ
Black coated paper & backing
>150µ
Release Liner
75µ

Above values are general guides for illustration purposes only.




Process Temperature Indicator   Recoding Dishwasher Surface Temperature
 process_temperature_indicator    recording_surface_temperature



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