Hello, recently I have suffered with poly tint lens during hard coat process,it's become frosted,trying lots of things for resolving the issue but not succeed.any idea will be very helpful.
Poly tint frosted during HC process
Hello, recently I have suffered with poly tint lens during hard coat process,it's become frosted,trying lots of things for resolving the issue but not succeed.any idea will be very helpful.
Are you trying to HC a tinted poly lens? Generally Poly material does not tint so you HC first then tint. If the lens is fogging in that process it means the HC was not correctly cured.
No,we do tint first then HC.previously we also do the same but now some lens become foggy.
The common cause of poly lens frosting is due to uncoated material being cleaned with a solvent solution.
The lens must be tinted prior to tinting. I you are applying a secondary hard coat check coater to make sure lens is completely dry or as you suspect curing process might be off due to "weak" UV bulb
Any changes to hard coat type or cleaning solutions?
Last edited by PRECISIONLAB; 07-31-2022 at 12:57 PM.
Cleaned with methanol,& for itching in machine tank naoh solution used
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