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 which is 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:
|Melinex Polyester Film (171ºC and below)||50µ|
|Kaladex Film (177°C to 204°C)||50µ|
|Kapton Polyimide Film (210¬ºC and above)||50µ|
|Adhesive & Carrier (without liner)||75 – 85µ|
|Black Coated Paper & Backing||>150µ|
Above values are general guides for illustration purposes only.