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Thread: Poly Cracking

  1. #26
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    Poly is our cheap alternative lense for rimless work. Try to use more Trivex or 1.60. Since moving in this direction we have had a 90% decrease in the "Crackies".
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  2. #27
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    Why do we blame a not so well done job on materials instead of the art of doing it well without regard to it.

  3. #28
    Master OptiBoarder OptiBoard Gold Supporter DragonLensmanWV's Avatar
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    Quote Originally Posted by Mike Fretto View Post
    We grind lenses for 6 offices if I could get the dispensers in 6 offices to quit selling poly I would be a happy man, but that aint gonna happin anytime soon.

    Just tell them poly has been discontinued. Don't have to say by whom.
    DragonlensmanWV N.A.O.L.
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  4. #29
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    Redhot Jumper Just tell them poly has been discontinued................................

    Quote Originally Posted by DragonLensmanWV View Post

    Just tell them poly has been discontinued. Don't have to say by whom.

    Polycarbonates, commonly known by the trademarked name Lexan, are a particular group of thermoplastic polymers. They are easily worked, moulded, and thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique plastic identification code and are identified as Other, 7.

    Probably one of the most successful plastic materials ever made will not be discontinued that easily

  5. #30
    Rochester Optical WFruit's Avatar
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    I too was going to suggest just telling them that it's been discontinued.


    Quote Originally Posted by Chris Ryser View Post
    Why do we blame a not so well done job on materials instead of the art of doing it well without regard to it.
    Yes, but if you can give them materials with superior optics and lenses that don't crack, why wouldn't you? And since we don't know the actual reasons for the cracks, why is it automatically assumed that they are made poorly? I think it says something that in order for the job to be made well, extra steps need to be taken (edge and hole coatings) just because it's a particular material.
    There are rules. Knowing those are easy. There are exceptions to the rules. Knowing those are easy. Knowing when to use them is slightly less easy. There are exceptions to the exceptions. Knowing those is a little more tricky, and know when to use those is even more so. Our industry is FULL of all of the above.

  6. #31
    Master OptiBoarder OptiBoard Silver Supporter Barry Santini's Avatar
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    I ahve NO poly cracking with Silhouette frames...except for the now discontinued Minimal X series (plastic side and big studs.

    All other drilled/screwed mountings get Trivex or 1.6/1.67. Period.

    Some "sub-chassis" metal frames (stiff, fully soldered eyewires) also crack with Poly. Poly is Ok optics, except for higher plus and minus, and the SV is fine when rendered in autograph.

    FWIW

    Barry

  7. #32
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    We recognize there have been issues with LifeRx. We are committed to proactively resolving any issues you experience with LifeRx and we stand behind every lens. Continual product enhancements are an ongoing practice as we strongly believe in continuous improvement.

    Standard, all LifeRx lenses are covered by a two-year patient warranty. This warranty applies to any front side coating or film defects. To speak with a Vision-Ease Lens representative about a replacement lens, please contact Sue Klein at 1-800- 328-3449 ext. 5301.

    To assist in maximizing LifeRx durability, please review the following processing tips:

    Improper sizing/tracing can put a lot of stress on any lens product, this is even more critical with a laminated product; this stress can create a trigger point for lens issues.

    We’ve witnessed grooved lenses where the groove is at the very front of the lens, hitting the exact spot where the laminate is molded. We recommend placing the groove at least 1mm back from the front of the lens.

    For additional help with technical questions or concerns please contact, Tim Nylen, at 763-506-9237.

    Thank you for the opportunity, your continued support and the space

  8. #33
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    Quote Originally Posted by Speed View Post
    You will get all kinds of advice on preventing this problem. The reason is that it is a commion, big problem. Find an alternative material and presto! The problem goes away.
    +1

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