HEATmarker M

The HEATmarker® M is a self-adhesive device that can be applied to any temperature-sensitive product to monitor the temperature exposure over time and provide a visual indication of when the cumulative heat exposure of the product has exceeded a pre-set limit. The indicator is over-laminated with red film, which reduces sensitivity to normal indoor light.

The inner circle of the HEATmarker M is made of heat-sensitive material that is initially light in color and becomes darker when exposed to heat (Fig. 1). The color change is faster at higher temperatures and slower at lower temperatures. At the discard point or end point, the inner circle is the same color as or darker than the outer circle.

Figure 1
HEATmarker M
Before heat exposure
Right arrow
HEATmarker M after heat event
After excessive heat exposure

Specifications

  • Response Temperature
    8°C
  • Response Time
    8 Days
  • Accuracy
    +/- 1.5°C *
  • Shelf Life
    225 days from date of manufacture
  • Size
    16 x 11 mm
  • Application

    Placed on product. Pressure-sensitive adhesive, for flat or curved surface applications.

For HEATmarker and HEATmarker VVM, they accumulate the effects of temperature continuously, changing color faster at higher temperatures and slower at lower temperatures. Therefore, a specific temperature is only relevant when combined with a specific time, e.g., 2 days at 37°C, to create a “response temperature profile” for HEATmarker and HEATmarker VVM.

*At a 0.1% AQL

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