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Thread: Our coating process

  1. #1
    OptiBoard Novice
    Join Date
    Dec 2016
    Lens Manufacturer

    Our coating process

    I was hoping you could help identify anything we are missing or doing wrong.
    Below I have written a comprehensive list of our current process. I would be more then grateful for any solicited comments or advice.

    Thank you

    Hard Coating:

    1. Let's assume a clean lense enters the potassium hydroxide/ city water bath for 300 seconds @ 50c including sonic.

    2. 300s of city water @ 40c

    3. 300s DI water at 60c with Sonic.

    4. 300s drying (ceramic heating) @ 65c

    5. 300s cooling ( empty tray)

    6. Primer ts-56 from tokuyama @ 11.2c for 20s. ( Lacquer has been stored at -20c for 19 months)

    7. Stage 4. Then stage 5.

    8. Lacquer ts-56 from tokuyama @ 11.2c ( Primer has been stored at -20c for 19 months)

    9. Stage 4.

    10. Out

    Oven (1 memment 110f oven)

    1. From HC straight into Oven after check at 40c holding temp

    2. Degass batch at 60c for 60 mins

    3. Curing @ 115c for 120 mins.

    4. Hold at 40c until ready for AR.

    Recommend AR process from service provider.

    1. Lens looks good after HC, spectrometer reads primer 0.7 and lacquer 2.9

    2. After AR lens looks good but saltwater test gives a range of 4-2 score in salt water, shock , tape test.

    3. AR coating is unstable, a very high percentage on lenses laminating completely in the following months.

    Looking forward to tweaking this process into a great results.

  2. #2
    OptiBoard Novice
    Join Date
    Jan 2021
    New Caledonia
    Optical Laboratory Technician
    My coating process is the same...
    I have same problem about AR coating which is unstable.
    You find a solution ? thanks a lot

  3. #3
    OptiBoard Professional Mauro.Airoldi's Avatar
    Join Date
    May 2007
    Bologna Italy
    Lens Manufacturer
    the first step is to visually determine whether the gap is between HC and lens or between HC and AR.
    If HC also delaminates, try HC only lenses in boiling DI water for 15 and after 15 extra minutes. If you have delamination you must check the quality of the HC, if the Primer also comes off you must check the correct washing (if you do not rinse well after the soap you risk having a bad adhesion).
    If you have delamination of the AR only, the first suggestion is to perform a Leak up rate to check the integrity of the vacuum (if you need, I'll explain the procedure but I need to know the type of system you have) the maximum allowable value must be less than 5 * 10-5 mb * l / s.
    let me know if you need more information.

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