It is essential when using boron trifluoride to have a trap in the delivery tube to prevent impurities from being sucked back into the cylinder. The destructive exotherm that ordinarily accompanies contact of this substance with epoxy compounds is avoided by gradual release of the catalyst. 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.
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