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Color Change Basics:Wax Melt

Wax Melt

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:

Component:
Print Foil
Melinex Polyester Film (171ºC and below)
Kaladex Film (177°C to 204°C)
Kapton Polyimide Film (210¼C and above)
Adhesive & Carrier (without liner)
Black Coated Paper & Backing
Release Liner

Thickness
>10µ
50µ
50µ
50µ
75 - 85µ
>150µ
75µ

Above values are general guides for illustration purposes only.

Process Temperature Indicator

Recoding Dishwasher
Surface Temperature

LCR Hallcrest LLC - US

1911 Pickwick Lane - Glenview, IL 60026
847.998.8580
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customerservice@hallcrest.com
info@hallcrest.com

LCR Hallcrest Ltd – UK

Riverside Buildings
Dock Road
Connah's Quay
Flintshire
CH5 4DS
+44 (0) 1244 817107
salesuk@hallcrest.com

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