On 12/13/2019 11:45 AM, Frank wrote:
On 12/12/2019 11:24 AM, dpb wrote:
On 12/12/2019 9:52 AM, wrote:
...

The problem is that the U/V damage goes all the way through the
plastic and polishing only tries to recover the surface.Â* Plastic will
never be as hard or U/V resistant as glass.

+238.5

I've polished the beegeezus out of the ones on the work truck...you'd
have to take off good fraction of the material it appears to get rid
of the crazing...it's not just a thin surface.

The 300M was almost as bad when traded it off.

It's terrible choice of material for purpose.

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The plastics used for lenses are generally polycarbonate and
polymethylmethacrylate.Â* PMMA has the best UV resistance.Â* Both have
about the same scratch resistance which can be improved by coatings.
UV resistant coatings and antioxidants help PC the most is it absorbs
and is degraded by UV.

I don't know (and don't really care) what they are...all I know (and
care about) is that they don't last worth crap in operating conditions
where I live and drive.

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