The tamperproof ColdMark Freeze Indicator accurately shows when your product has been exposed for more than 30 minutes to cold. This is accomplished by the temperature indicator's colorless bulb turning an irreversible violet color as temperatures fall below the indicator's response temperature.
Peel the release liner off the back of the ColdMark Freeze Indicator and adhere the pressure-sensitive adhesive backing to a dry surface. You can place the detection device on the exterior or the interior of a shipping container. ColdMark Freeze Indicators should not be placed where they are exposed to crushing pressure. These temperature indicators must also be stored above response temperature and not exposed to temperatures exceeding 110°F/43°C.
These ColdMark Freeze Indicators are available in five activation temperatures 26°F/-3°C, 32°F/0°C, 41°F/5°C or 50°F/10°C. The label measures 3¼" x ¾" x ⅜" and is sold in packs of 100. Additional shipping costs may be incurred during winter months due to temperature controlled packaging.