3M™ Freeze Watch™ Indicator 9805FW consists of a highly sensitive indicating liquid inside a specially designed ampoule to monitor exposure of temperature-sensitive products to freezing temperatures.
The ampoule fractures when exposed to temperatures equal to or below 0°C/32°F irreversibly staining the paper behind to indicate the product has been exposed to unacceptable temperatures. When placed directly on secondary shipper boxes of temperature-sensitive products during shipment and storage, the 3M™ Freeze Watch™ Indicator 9805FW provides a reliable measure of temperature exposure. Pressure-sensitive adhesive sticks to almost all clean, dry surfaces for a strong bond that securely holds the indicator in place throughout the shipping process. These indicators are ideal for monitoring products that are susceptible to damage when exposed to freezing temperatures during shipment and storage.