Chemical ratios in Epoxy

Hello
    I've been trying to track down a general idea of the chemical ratios in "epoxy" (ie C:H:O:.. etc).
    While it seems there are a wide varieties of brands, when a chemist includes "epoxy" in a chemical name what are they referring to?
Thanks for any info.
Anthony
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An epoxy is any resin that contains one (or more) of the three membered oxirane ring - C-O-C (with appropriate hydrogens added)
The oxirane ring has been attached to numerous resin backbone structures as other have noted.
RT
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