CR-39 material

(redirected from allyl diglycol carbonate)

CR-39 material 

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.
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 monomer.