Plastic (CR39) Lens Technology

CR39 stands for Columbia Resin batch 39 manufactured by the Pittsburgh Plate Glass company, which had laboratories in Columbia, this is made up of hard cast resin (CR).


  • Half the weight of glass lenses.
  • Much more shatter-resistant (but not shatter-proof).
  • Consistent colour no matter the thickness (preferable for prescription lenses).
  • Can be ground and polished like glass.


  • Must be dyed to achieve colour; dyes are not as permanent.
  • Tint consistency is difficult to achieve.
  • Scratch easier than glass, even with scratch-resistant coating.
  • Susceptible to colour and coating fading (thermal bleaching) when exposed to heat.
  • Can warp when exposed to excessive heat (>120ºC)
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