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  1. #1

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    glass with high UV transmission

    Hi everyone!

    Does anyone know what glass should be used for contact printing frame?
    I mean, is there a glass with very high UV transmission? Since better transmission means shorter exposure time.

    There seems to be little info on the subject.
    Any help is appreciated!

  2. #2

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    Regular glass is all that is necessary. I am sure there is special glass, but think getting it would be an unnecessary expense.

    Michael A. Smith

  3. #3
    Shawn Dougherty's Avatar
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    The only issue I've had involving print frame glass was Newton's Rings. That was solved by using reflection control framing glass with the slightly textured side toward the negative. I work in a frame shop so just used scrap but it's cheap, a kind framer might even give you a piece. Take your frame in so they can cut it to size.

    Shawn

  4. #4

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    Thanks for tips!
    So, regular glass is ok for a vacuum frame, which I hope to build myself

    What about plexiglass? Is it better when it comes to UV transmission?
    I am asking because I saw a guy on youtube using plexiglass for his contact printing frame.

  5. #5

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    As far as glass that transmits UV, don't they make those special UV lenses out of quartz-fluorite glass? I don't know where you'd get that kind of glass in sheet form for contact printing though, or any other form for that matter.

  6. #6

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    They use fused quartz or fluorite. Pure.

    Normal glass is mostly (fused) silica, with additions.

  7. #7

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    Quote Originally Posted by JSebrof View Post
    As far as glass that transmits UV, don't they make those special UV lenses out of quartz-fluorite glass? I don't know where you'd get that kind of glass in sheet form for contact printing though, or any other form for that matter.
    Quartz-fluorite > sounds very expensive

    What glass is used in vacuum printing frames which are for sale at Edwards Engineered Products? Is it a regular glass or something special?

  8. #8
    Shawn Dougherty's Avatar
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    Quote Originally Posted by revaz_kv View Post
    Thanks for tips!
    What about plexiglass? Is it better when it comes to UV transmission?
    I remember reading somewhere that Plexi blocks more UV than regular glass. Naturally I do not remember the source. =) Might be worth checking into...

  9. #9

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    We use regular glass in our vacuum frame.

    Michael A. Smith

  10. #10
    Poisson Du Jour's Avatar
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    Calcium fluorite (CaF2) even better!

    Failing that (by cost alone...) you could use an offcut of TruVue UV-retardant glass used in MGCF jobbing; most high-end frame shops use this, and all of my Ilfochromes have been framed under it since 1994.
    .::Gary Rowan Higgins

    One beautiful image is worth
    a thousand hours of therapy.


    "It is horrifying that we have to fight our own government
    to save the environment."
    .::Ansel Adams






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