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Thread: UV protection on Polycore and Hoya untreated CR-39 lenses?

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    UV protection on Polycore and Hoya untreated CR-39 lenses?

    Referring to sun lenses only. Does anyone happen to know if Polycore and Hoya CR-39 lenses without AR/scratch resistance have UV400 protection? Sadly I can't find this information anywhere.
    Last edited by Airegin; 08-07-2018 at 12:11 PM.

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    Blue Jumper UV treatment of CR39 lenses ..................................

    Quote Originally Posted by Airegin View Post

    Does anyone happen to know if Polycore and Hoya CR-39 lenses without AR/scratch resistance have UV400 protection?

    Any untreated CR39 lens material will give a full 100% transmittance.

    I came up with the first successful commercially available product called *UV Protec* in 1982, where you treated the lenses in the hot solution for 25 minutes to treat the lens for a 100% protection by filling the lens pores with protective and UV absorbing crystals.

    2 years later we came up with a version that would do the job in 5 to 10 minutes.
    Chris Ryser
    ________________________________________
    DLO. NA.IC.I.T.PO

    http://optochemicals.com............................. http://arcoatings.com

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    I'm sorry but that couldn't be further from the truth. I know for a fact that untreated untinted CR-39 has 100% UVB protection and at least some UVA (up to 90%). On top of that the lenses I'm asking about are tinted and block 85% of light, no way you get 100% UV transmittance here.

    I figure it won't be easy to come up with a clear answer as both companies do not provide this information. CR-39 in general may not be the best choice for optimal protection. Can I at least be sure of 100% UVA protection if I order MR-8 lenses?
    Last edited by Airegin; 08-13-2018 at 09:14 PM.

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    Not sure where you are getting your CR39 from, but most of our untreated CR39 lenses at dress thickness transmit in excess of 32% UVA, no where near 90% protection claimed here. Of course, Zeiss and Essilor have added UV inhibitors in their newest batch of CR39 pucks, but this is not yet an industry standard.

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