Pre-mixed and frozen (PMF) adhesives started with Hughes Electronics Defense Division post WWII. One of the first applications used polysulfide-based materials related to aircraft fuel systems.
To obtain the PMF adhesive, Appli-Tec mixes the Part A (resin) and the Part B (hardener) of an adhesive system, typically, Polyurethanes, Epoxies, Polysulfides, and Silicones.
Appli-Tec then degasses or removes the air from the mixture and freezes the material to <-40°C. The product is shipped under dry ice to maintain the <-40°C temperature. By storing the material at less than <-40°C, the reaction is stopped for months – up to one year.
When ready to use, customers simply remove a syringe from the freezer, wait 10 – 30 minutes (depending on syringe size) for the syringe to thaw, then use. The material is as good as if it were mixed minutes prior.
Plus a little humor too. Delivered to your inbox once a month.