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How color changes

High-temperature resistant indicators printed on metal base label

Temperature range:250~450℃
RoHS Non-Compliant

THERMOPROOF is the label shape product of Thermo-Paint™. The reverse side is coated with adhesive material for easy apply.
The color changing characteristics is the same as irreversible Thermo-Paint™.
*For use at 10℃ or below or at 15℃ or below follow the instructions
*Not available at vacuum conditions. 

Reversible Irreversible Semi-reversible


  • Thermo-Paint™ in label shape
  • Easy apply
  • High temperature monitoring


 *Colors  shown are approximate colors. 

Type Indication Temperature Before After JAN Code
G-1 25 250℃
Light greenish blue

Reddish gray
29 290℃
Light pink

31 310℃
Bright bluish gray

33 330℃
Light blue-green

G-2 ※36 360℃

Brownish gray
41 410℃

Brown white
44 440℃

Greenish gray
45 450℃

10 pcs/case
※Non-RoHS Compliant


Apply where heating temperature monitoring is required.

Usage consideration

  • Clean apply surface well before applying label
  • Use THERMOPROOF within 1 year after purchase.
  • Lower temperature under 10C° can deteriorate the bend ability and might cause the label cracking.
  • Adhesive ability is deteriorated under the temperature lower than 15C°. Under such a condition, heat the label and applying surface up to around 25C°.
  • Use the label as soon as after purchase. Aging can deteriorate adhesive ability but it does not affect the performance.


Store unused indicators under room temperature and dark condition Avoid excessive humidity



  • Use within 1 year after purchase

Information on the toxic substance in the raw material

Please refer to SDS of THERMOPROOF


Directive of RoHS

THERMOPROOF doesn’t contain chemical substance prohibited in the RoHS directive except for No.36


Hazards identification

Immediate health, physical, and environmental hazards: The environmental properties of this product present a low environmental hazard. This product, when used under reasonable conditions and in accordance with the directions for use, should not present a health hazard. However, use or processing of the product in a manner not in accordance with the product's directions for use may affect the performance of the product and may present potential health and safety hazards.



The information in this sheet is believed to be correct as of the date of issue Nor the selling, nor the producing company make no warranties, expressed or implied, including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose or course of performance or usage of trade. The user is responsible for determining whether this product is fit for a particular purpose and suitable for user's method of use or application. Given the variety of factors that can affect the use and application of this product, some of which are uniquely within the user's knowledge and control, it is essential that the user evaluate this product to determine whether it is fit for a particular purpose and suitable for user's method of use or application.


*THERMOLABEL, RETOMARK, MEDESHILL, UVLABEL, DEWLABEL and Thermo-Paint in all the contents including digital catalog in this website are registered trademarks in Japan of NiGK Corporation.

THERMOLABELis registered trademark of NiGK Corporation, in Japan,New Zealand and Philippines.

THERMOLABELisregistered trademark of NiGK Corporation, in Japan,Australia,European Union and Switzerland.


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