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 @ 50°c including sonic.
2. 300s of city water @ 40°c
3. 300s DI water at 60°c with Sonic.
4. 300s drying (ceramic heating) @ 65°c
5. 300s cooling ( empty tray)
6. Primer ts-56 from tokuyama @ 11.2°c for 20s. ( Lacquer has been stored at -20°c for 19 months)
7. Stage 4. Then stage 5.
8. Lacquer ts-56 from tokuyama @ 11.2°c ( Primer has been stored at -20°c for 19 months)
9. Stage 4.
10. Out
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Oven (1 memment 110f oven)
1. From HC straight into Oven after check at 40°c holding temp
2. Degass batch at 60°c for 60 mins
3. Curing @ 115°c for 120 mins.
4. Hold at 40°c until ready for AR.
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AR
Recommend AR process from service provider.
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Results
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.
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