Freeze-thaw testing is a way to determine whether or not your formulation will remain stable in low temperature conditions. The test is designed to replicate the kind of conditions potentially encountered during shipping and handling.
Freeze-thaw stability is used to measure the effect of temperature changes on an emulsion. This is done for two reasons, one to measure the overall emulsion stability as this can accelerate changes and two to mimic potential outdoor storage conditions of a final emulsion formulation. Due to the application of these products they may be stored outside and so are subject to large temperature fluctuations in some regions.
The polymer emulsion is cooled to -27°C over 1 hour and kept at that temperature for 15 hours. Hereafter the sample is brought to 23°C over 1 hour and kept at that temperature for 7 hours. This cycle is repeated 3 times and if the sample has neither gelled nor separated after 3 cycles, it passes freeze-thaw stability.
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