Allyl diglycol carbonate | definition of allyl diglycol carbonate by Medical dictionary
CR-39 material (redirected from allyl diglycol carbonate)
Allyl diglycol carbonate or Columbia Resin. CR-39 is a light transparent plastic material (refractive index 1.498, V = 59) used in the manufacture of spectacle lenses and much harder than polymethyl methacrylate. It is not quite as hard as glass. Syn.
hard resin. See constringence
; plastic lens
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive
On the basis of the lens material the plano sunglasses market is broken down into polyurethane, CR-39 or allyl diglycol carbonate
(ADC), polycarbonate, and others such as glass and nylon.
It makes its plastic lenses from PPG Industries Inc.'s CR-39 allyl diglycol carbonate