Pack Size: 50 Encapsulated Indicators
SpotSee® Thermax Encapsulated Irreversible Temperature Indicators provide a fast, accurate and permanent record of maximum temperature exposure. Each indicator is printed with a single rated temperature. When that temperature is exceeded, the central window permanently darkens, giving clear, tamper-proof evidence that the threshold has been reached.
Thermax records heat exposure above its rated temperature (37–290°C). For refrigerated or frozen shipments (for example 2–8°C), see our Cold Chain Monitoring range.
The compact “end-cap” format is ideal where space is limited or where indicators are exposed to handling, vibration or demanding environments. Typical uses include medical and life-science products, rail and industrial bearings, motors and drives, electronics, and high-performance or motorsport applications where it is essential to verify that critical components have not overheated.
Key Features
- Single-temperature irreversible indication – clear “go / no-go” result
- Encapsulated design for robust performance in demanding environments
- Permanent colour change – cannot be reset or tampered with
- Small footprint – suitable for curved or confined surfaces
- Fast response and high accuracy across the full temperature range
- Self-adhesive backing for easy application
- Supplied in packs of 50 indicators
How They Work
Each Thermax Encapsulated Indicator contains a sealed, heat-sensitive element behind the printed temperature window. When the surface temperature reaches or exceeds the rated value, the active material melts and migrates, causing the window to darken. This reaction is irreversible – once triggered, the indicator will not return to its original colour.
The indicator therefore records the highest temperature reached at any point during use, storage or transport.
Typical Applications
-
Medical & Life Sciences: sterilisation checks, sutures, sterile packs, instruments and devices.
-
Predictive Maintenance: rail bearings, industrial bearings, rotating equipment and gearboxes.
-
Motorsport & Automotive: brake calipers, shock absorbers, engine components.
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Electronics: PCBs, assemblies, power supplies and enclosures.
-
Industrial Processes: ovens, chambers, pumps, compressors and QA monitoring.
Technical Specifications
| Brand |
SpotSee® |
| Product Family |
Thermax Encapsulated Indicators |
| Type |
Single-level irreversible indicator |
| Format |
Encapsulated label (“end-cap” style) |
| Activation |
Permanently darkens when rated temperature is exceeded |
| Temperature Units |
°C printed on label (°F shown on artwork) |
| Pack Size |
50 indicators |
| Adhesive |
Pressure-sensitive |
| Operating Range |
37–290°C (standard variants below) |
Temperature Options (Standard Variants)
Select your required temperature from the dropdown above. Each variant contains 50 indicators of the same activation temperature.
| °C |
°C |
°C |
°C |
| 37 |
40 |
42 |
43 |
| 44 |
46 |
49 |
54 |
| 60 |
62 |
65 |
71 |
| 77 |
80 |
82 |
88 |
| 93 |
99 |
104 |
110 |
| 116 |
121 |
127 |
132 |
| 138 |
143 |
149 |
154 |
| 160 |
166 |
171 |
177 |
| 182 |
188 |
193 |
199 |
| 204 |
210 |
216 |
224 |
| 232 |
241 |
249 |
254 |
| 260 |
280 |
290 |
|
Pricing: 37–154°C use standard pricing; 160–290°C use the high-temperature pricing band.
Other temperatures: 33°C and 34°C are made to order by SpotSee as a special production run. Contact us for a price and lead time.
Documentation & Case Studies (PDF)
These official SpotSee® resources provide additional detail on how Thermax® indicators are used in real-world applications:
Stock & Availability
Temperatures shown as In stock are held in the UK. Temperatures shown as Special order are ordered in from SpotSee and dispatched in about 4 weeks. The status for each temperature is shown when you select it. Less common temperatures or larger quantities may be supplied on lead time.
All Thermax indicators supplied by Stuck For® (a brand of Good Life Innovations Ltd) are genuine SpotSee® products sourced only through authorised channels.
