Thoroughly knowing epoxy resin chemistry is not necessary before using a System Three product, but having a rudimentary chemical knowledge will help you complete any project more effectively, avoiding pitfall or surprises which may arise when using epoxy containing materials.
The resin that is the basis for all epoxy is the diglycidyl ether of bisphenol A (DGEBA). Bisphenol A is produced by reacting phenol with acetone under suitable conditions. The "A" stands for acetone, "phenyl" means phenol groups and "bis" means two. Thus, bisphenol A is the product made from chemically combining two phenols with one acetone.
Caution should be observed when using epoxy resins with polyester resins, because epoxy resins may be applied over cured polyesters that have been de-waxed and well sanded, but polyesters should never be used over cured epoxy resins.
Unreacted amine in the epoxy inhibits the peroxide catalyst in the polyester causing an incomplete cure at the interface, and sanding does not get rid of unreacted amine. The result is a poor bond even though the surface appears cured, and debonding will be the inevitable consequence.
Measuring and mixing is really easy with most System Three Epoxy systems because they mix at a 2:1 or 1:1 volume ratio, but this doesn't mean you don't have to pay attention to what you're doing. Be certain to read the label or Technical Data Sheet to see what the proper ratio is for the product that you are using.
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