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Nonreversible freeze-thaw indicator

  • US 4,148,748 A
  • Filed: 02/22/1977
  • Issued: 04/10/1979
  • Est. Priority Date: 11/02/1976
  • Status: Expired due to Term
First Claim
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1. A nonreversible freeze indicator adapted to detect whether an article has been subjected to freezing conditions comprising an encapsulated translucent to opaque colloidal dispersion of organic solid particles suspended in a liquid medium, said colloidal dispersion having the property of becoming nonreversibly destabilized upon freezing which thereafter coagulates to form a non-flowing waxy gel when raised above its freezing temperature thereby providing a telltale visual sign that said indicator has been subjected to freezing conditions, said organic solid particles having a diameter of about 0.7 microns or less and said dispersion having from about 10 weight percent to about 50 weight percent of said organic solid particles.

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