Typified by boron trifluoride and its complexes these lewis acid catalytic epoxy curing agents homo polymerise the epoxide group rather than the co reaction mechanism of reactive intermediates that is applicable for the amines and anhydrides. For this reason closed containers such as cylinders should be filled only by experts. When mixed with standard epoxy bisphenol a resin it provides a very fast tack free cure at room temperature assuming little or no heat sink effect.
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