CR-39 material

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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 ?
The clear resins covered in this report are: acrylics, polycarbonates, polystyrenes, styrene block copolymers (SBCs), styrene acrylonitrile (SAN), acrylonitrile butadiene styrene (ABS), polysulfones, thermoplastic polyesters (almost exclusively polyethylene terephthalate (PET)), polypropylene, acrylic-styrene copolymers (SMMAs), polyvinyl chloride (PVC), nylon, cellulosic resins, cyclic olefin copolymers (COCs) and allyl diglycol carbonate (ADC) (for optical applications).
Contract award: Polyn Allyl Diglycol Carbonate (PADC) also known as CR-39 sheets Supply of Lot 1 and Cutting and Encoding of Lot 2.
Those clear resins covered in this report specifically include: acrylics, polycarbonates, polystyrenes, styrene block copolymers (SBCs), styrene acrylonitrile (SAN), ABS, polysulfones, thermoplastic polyesters (almost exclusively, PET), polypropylene, acrylic-styrene copolymers (SMMA), PVC, nylon, cellulosic resins, cyclic olefin copolymers (COCs), and allyl diglycol carbonate (ADC).