Thermax Irreversible Temperature Indicator Labels


For over three decades we've carried a comprehensive range of Thermax irreversible encapsulated indicator labels, and we've shipped them all over the world!

Thermax irreversible temperature indicators are a simple, cost-effective temperature monitoring program based on proprietary color change technologies. Irreversible temperature indicators provide a permanent record that an item has reached or exceeded its rated temperature.

They can usually be used in most applications where temperature is a concern.

See below for instructions on how to ensure you choose the right label for your specific application.

These self-adhesive labels 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.


• Clear color change shows maximum temperature experienced

• Permanent record of highest temperature

• Immediate response to temperature

• Cost effective temperature monitoring solution

• Oil, water, and steam resistant


• Easy to read - Distinct color change when temperature been exceeded (Clear to BLACK).

• Easy to use – Product arrives ready to use. No pre-activation required.

• Easy to implement – Solutions available for low volume scenarios or for high volume manufacturing lines.

We carry a huge range of these labels and can customise them to your specific needs. We offer a variety of temperature options from 29C to 290C, various colours and all kinds of shapes and sizes. 

We also have 35 years experience of supplying these labels all over the world. We've developed a deep understanding of how and where these labels can be used effectively and how to deploy them effectively in the field.

However, BE WARNED: we've learned over the years that there are various circumstances in which these labels WILL NOT WORK (vacuums being one, microwaves being another), and other applications where we recommend specific procedures to ensure the indicators remain reliable and effective.

We therefore recommend that you contact us prior to purchasing. We provide a free consultation service and won't ever recommend a product unless we are 100% sure it will be both accurate and reliable. 

If you have any questions about using these irreversible temperature indicator labels or have a specific application in mind but are unsure which product is best suited to your needs, just contact us and we will guide you through the options before you make a purchase.  

Remember, this is all we do and we care about making the right recommendation first time, every time.

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  • Tim Arrowsmith