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CR-39 material
(redirected from hard resin)

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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.


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Also, any incompatible tackifier in uncured elastomer will remain in the highly phase-separated stage at low temperature (well below the softening point of the tackifier), and the hard resin will fucntion as reinforcement up to the softening point of the tackifier (27).
Urethane Acrylate Resin B is a hard resin that is 60% solids in n-butyl acetate and has a viscosity of 200 mPas at 25[degrees]C.
Weigh 49 grams of letdown vehicle (3:1 ratio of a hard emulsion Tg = 100[degrees]C: hard resin Mw of 9,000 g/mol) into a 4 oz jar.
 
 
 
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