Durcupan is a water-soluble
epoxy resin produced by the Fluka subsidiary of
Sigma-Aldrich. It is commonly used for embedding
electron microscope samples in plastic so they may be sectioned (sliced thin) with a
microtome and then imaged.
Durcupan is notable for refractive index nD20 of 1.654, which is a very high value for epoxy resins.[
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