Thermax® 8-Level Irreversible Temperature Labels provide a clear, permanent indication that multiple calibrated temperature thresholds have been exceeded. Each of the eight windows turns permanently black when its rated temperature is reached, creating a tamper-evident record of cumulative heat exposure.
These labels are widely used in manufacturing, storage and transport environments where monitoring multiple temperature points is essential. Once activated, the colour change is irreversible—ensuring reliable evidence that cannot be reset or concealed.
| Product type |
Irreversible temperature indicator label |
| Windows |
8 irreversible temperature windows per label |
| Label size |
2.00" × 0.70" (51 × 18 mm) |
| Orientation |
Vertical |
| Scale |
°C and °F |
| Adhesive |
Self-adhesive backing |
| Pack size |
Pack of 10 labels (per range) |
Available temperature ranges
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Range A: 37, 40, 43, 46, 49, 54, 60, 65°C (99, 104, 109, 115, 120, 129, 140, 149°F)
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Range B: 71, 77, 82, 88, 93, 99, 104, 110°C (160, 171, 180, 190, 199, 210, 219, 230°F)
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Range C: 116, 121, 127, 132, 138, 143, 149, 154°C (241, 250, 261, 270, 280, 289, 300, 309°F)
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Range D: 160, 166, 171, 177, 182, 188, 193, 199°C (320, 331, 340, 351, 360, 370, 379, 390°F)
-
Range E: 204, 210, 216, 224, 232, 241, 249, 254, 260°C (399, 410, 421, 435, 450, 466, 480, 489, 500°F)
Key features
- Eight discrete, irreversible temperature indicators
- Permanent colour change for tamper-evident monitoring
- No power source or calibration required
- Durable construction resistant to oil and moisture
Typical applications
- Process validation and quality assurance
- Transport and storage temperature monitoring
- Warranty validation and compliance documentation
- Equipment, enclosures and heat-sensitive components
Availability & supply notice
- Temperature ranges are supplied subject to availability and manufacturing lead times.
- Certain ranges may be temporarily unavailable due to production scheduling or supply-chain constraints.
- If a selected range is unavailable, we will contact you promptly with revised lead times and/or suitable alternatives before dispatch.
- If you require confirmation of availability for a specific range or quantity, please contact us prior to ordering.
