In-House Scratchguard

[Virginia]

Does anyone have anything (good or bad) about in-house scratchguard coatings?

Baking vs. dipping?

Thanks for input.

[Jeff Trail]

Depends on your product...are you going to be doing a lot of poly as well? or mostly CR39/High Index stuff ?

Jeff "coating poly is a pain" T.

[rjallison]

Nu-chem has a UV/scratchcoat that seems to work okay. You basically dip it for a few minutes. It must do something because dry erase markers won't write on them anymore which would lead me to believe that it is a hyrdophobic coating.
Rodney

[Maria]

we don't coat polycarb lenses with a hardcoat, as they're supposed to already be scratch resistant. So, are they, or not?

[Jeff Trail]

Maria,

All polys come coated.. but if you are sufacing it then you need to back side coat it again :) ..99% of all PAL's, high index come with a front surface factory coating.. but it's the backside coating if they are surfaced is what needs to be applied..if you had a poly with only the front surface coated and the backside not coated.. you would be able to tell pretty quickly, if you ran it under tap water it would scratch!! poly maybe impact resistant but as for surface abrasion..boy does an uncoated poly surface scratch easy..
Oh and that UV/RLX (scratch coat) combo ?.. you should NOT use that if the lens is going to get an anti-reflective coating :)

Jeff "grind'em if ya got'em" Trail