Originally Posted by
chance
Hey all, I have been researching and experimenting with Carl Zeiss CR-39 lenses. My aim is to make the lenses softer because I am popping them into some brittle frames that have a tendency to crack during lens insertion. I have read that CR-39 is a thermoset plastic that will not soften when heat is applied, but in my experiments I have found that a quick minute in the microwave makes them very bendy. I have also read that others have seen them soften while tinting, and have read rumors of lenses shrinking in places like a hot car in Arizona. My question is this:
Does anyone have experience heating CR-39? Has anyone seen permanent damage? i.e. warping, clouding, brittleness, distortion or otherwise after heating CR-39 lenses? Thanks very much for any input.
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