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Optical epoxy

RELATED TOPICS: EPOXY
Q: An antique appraisal TV show made reference to an optical epoxy, used in ceramic restorations, that doesn't yellow over time. Typically I've used Devcon five-minute epoxy for making instrument gauge lenses, and although it looks realistic for quite a while, it eventually discolors. Have you ever heard of optical epoxy, and do you have a source for it?

- Al Mastraccio
via E-mail

A quick Internet search for "optical epoxy" turned up a number of websites on the subject. Optical epoxy is a specialized compound used extensively in industries that rely on precision optics, such as microscope and telescope manufacturers and makers of prescription diving masks. The epoxy is transparent and has the same refraction index as glass. Most optical epoxies require 18-24 hours to cure.

For your purposes, Al, optical epoxy would create great non-yellowing, crystal-clear lenses. However, the cheapest I could find was at www.hisglassworks.com, and the smallest quantity offered, 1/4 lb., sells for $45. If anybody has another source, let us know. Until then, I'll stick with Devcon - yellow or not.


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