Irreversible Temperature Labels

Photochromics (PCs) transform from clear to color by changing their chemical structure after absorbing UV light.
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Sharply defined melting points of a purified organic chemical provide unique, high precision temperature sensitive phase change indicators with 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 to black.

Offering precise readings, these irreversible temperature labels combine:

  • Defined melting points– Giving high accuracy with the ability for you to specify exact requirements based on your needs
  • Individually Coated– Allowing you to design your label giving you accurate and clearly defined results
  • Permanent Color Change– Allowing you to keep records for quality control and due diligence or records abuse of your products in the field


  • Process Control – Giving you consistent results
  • Test & Measurement – Delivering accurate results
  • Quality Control– An affordable solution to safeguard quality
  • Safety Indicators– Protecting people, equipment, machinery, and products
  • Warranty – Removing the risk of false claims
  • Maintenance – Reducing downtime and maximizing performance

Temperature Range

  • 29-290°C and 84-554°F

Color Change

  • THERMAX Strips containing temperatures only up to
    210°C / 410°F – Silver/White to Black
  • THERMAX Strips containing temperatures of 212°C / 414°F
    and above – Orange to Black


  • THERMAX Strips containing temperatures only up
    to 160°C / 320°F – Polyester
  • THERMAX Strips containing temperatures between
    165 and 210°C / 329 and 410°F – Polyethylene Naphthalate
  • THERMAX Strips containing temperatures of
    212°C / 414°F and above – Polyimide


  • Strips can be supplied in packs or rolls – Convenient
    and simple to apply
  • Custom designs – Offering a bespoke solution
  • Custom sizes, shapes and materials – Designed
    to suit a wide range of application

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