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Thermex® Tactile Surface Temperature Indicating Materials

Example of color enhanced image generated on Thermex® paper

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Thermex® is a unique temperature indicating material. As thin as a standard sheet of paper, Thermex® changes color to reveal relative temperature distribution between any two contacting surfaces. Upon exposure to temperature the Thermex® sheet instantaneously and permanently changes color. The intensity of that color is directly related to the temperature it was exposed to, allowing Thermex® to spot high or low temperature zones. Thermex® is inexpensive, precise and disposable.

Common Applications:

  • Form fill and seal machines
  • Ultrasonic welding
  • Lamination presses
  • Vacuum & Flat Web type machines
Temperature Range 200° F to 300° F (90° C to 149° C)
Dimensions 18 in x 13 in (45.7 cm x 30.5 cm)
Thickness 2 mil (0.05 mm)

Normal Minimum Heat Seal Temperature
Low Density Polyethylene 245° F (118° C)
High Density Polyethylene 285° F (141° C)
Polypropylene 350° F (177° C)
Ionomer (Surlyn) 220° F (104° C)
Ethylene Vinyl Acetate Copolymer (12%) 200° F (93° C)
Ethylene Vinyl Acetate Copolymer (18%) 170° F (77° C)