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Freeze Indicators
FREEZEmarker® Irreversible Freeze Indicators
FREEZEmarker single-use indicators irreversibly change color from green to white to signal that a freeze event has occurred. A FREEZEmarker can be affixed to an individual unit to monitor the product from manufacture to use, or later in the cold chain to monitor the product for a portion of its distribution. Standard FREEZEmarker indicators are available with response temperatures of 0°C, -1°C and -5°C (all ± 1°C). Customized temperature limits can be developed to suit customer needs.

FREEZEmarker® is a Patented Colloid Indicator
FREEZEmarker is a patented colloid indicator. The active substance is composed of extremely small particles of a material that is evenly and stably distributed in a liquid. At a very precise temperature the small particles in the FREEZEmarker colloid become unstable, removing the repulsive forces that keep particles separate, and allowing the coagulation that forms the opaque white color.