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Thread: Transitions lenses 1.498 question

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    Transitions lenses 1.498 question

    I am aware that this kind of question should be addressed to the manufacturer, but does anybody know why the Transitions 1.5 lenses are not being made from CR39 material, but from some material with index 1,5 ? On the other hand the other - high index materials are like they supposed to be :) it means mr8, mr7 or 10 ..
    Last edited by essegn; 11-28-2014 at 04:50 PM.

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    Independent Problem Optiholic edKENdance's Avatar
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    I've wondered the same thing. I thought that the transitions aspect was added by the transitions people to whatever companies sent them. For example: if Seiko wanted to create some SV stock lenses with transitions then they would send them their stock lenses to be treated. Is this not correct?

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    ABOM Wes's Avatar
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    Perhaps CR-39 is chemically incompatible with Transitions chemistry?
    Wesley S. Scott, MBA, MIS, ABOM, NCLE-AC, LDO - SC & GA

    “As our circle of knowledge expands, so does the circumference of darkness surrounding it.” -Albert Einstein

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    ATO Member HarryChiling's Avatar
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    Technically CR-607 it is a tweaked version of CR-39 from my understanding many slight variations of CR-39 exist. PPG decided to market CR-607 as CR-39 to avoid any confusion. Two other variations are CR-424 and CR-630 which are used for photochromics.

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    Compulsive Truthteller OptiBoard Gold Supporter Uncle Fester's Avatar
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    Quote Originally Posted by edKENdance View Post
    I've wondered the same thing. I thought that the transitions aspect was added by the transitions people to whatever companies sent them. For example: if Seiko wanted to create some SV stock lenses with transitions then they would send them their stock lenses to be treated. Is this not correct?
    Here's a thread dealing with transition application methods for various materials.

    http://www.optiboard.com/forums/show...light=imbedded

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    Independent Problem Optiholic edKENdance's Avatar
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    Quote Originally Posted by Uncle Fester View Post
    Here's a thread dealing with transition application methods for various materials.

    http://www.optiboard.com/forums/show...light=imbedded

    Thanks Uncle Fester. You're my favourite Uncle.

  7. #7
    OptiWizard
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    Hi Everyone,
    Checked in this morning and caught this thread.

    CR607 is mostly a CR39 polymer.

    In the early days of the Transitions lens and photochromic sun lens project development at PPG in Barberton Ohio, we found that using co polymers with CR39 greatly enhanced the bang for the buck of the photochromic dyes that were also being developed for optical products...and greatly reduced our manufacturing issues for thicker blank configurations.
    At first we called it CR39 High Performance (CR39HP), but later changed it to CR300 (polymer of the initial Transitions Lenses). PPG R&D improved the CR300 series and it evolved it to CR307 by the time we launched Transitions Plus in 1992. From 1992 to 2001, all Transitions 1.50 was cast with CR307.

    With the launch of Transitions Next Generation in 2002, R&D developed a better package for the polymer and it became CR607. The base monomer is still CR39, but with a package that can handle the subsequent generation changes of dyes that included the latest and greatest family of dyes that are used for the current Transitions Signature VII.

    I hope this helps...
    Jim
    Jim Schafer
    Retired From PPG Industries/
    Transitions Optical, Inc.

    When you win, say nothing. When you lose, say even less.
    Paul Brown

  8. #8
    OptiWizard
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    Quote Originally Posted by HarryChiling View Post
    Technically CR-607 it is a tweaked version of CR-39 from my understanding many slight variations of CR-39 exist. PPG decided to market CR-607 as CR-39 to avoid any confusion. Two other variations are CR-424 and CR-630 which are used for photochromics.
    CR607 was never marketed....it is only available to manufacturers casting Transitions lenses in their designs. CR424 was part of the CR400 series developed in the 90's for mid index Transitions lenses The 424 was cured by UV.

    CR630 is for 1.50 Transitions as a premix that contained catalyst...when fully catalyzed and cured it had the same characteristics as lenses cast with CR607.

    I think what you meant was to process the CR607 lenses as you would CR39 at lab and office levels....but best practice is to treat more like higher index with slower speeds and larger chucks etc...it is an expensive lens so handle with care!

    Jim
    Jim Schafer
    Retired From PPG Industries/
    Transitions Optical, Inc.

    When you win, say nothing. When you lose, say even less.
    Paul Brown

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