VAR-0.25 is a broad band antireflection coating that is commonly used in demanding sunlight readability applications.
Reflection:
The reflection of the coating shall meet the reflection reducing requirements of MIL-C-14806.
Adhesion:
The coating shall show no evidence of damage when an approved tape is pressed firmly against the coated surface and quickly removed normal from the surface. (Reference MIL-PRF-13830B, Appendix C, para. C.4.5.12)
Abrasion:
The coating shall show no evidence of deterioration after being subjected to a 40-rub eraser test using a rub force of 2-2-1/2 lbs. (Reference MIL-PRF-13830B, Appendix C, para. C.4.5.10)
Humidity:
The coating shall show no evidence of deterioration after being subjected to a continuous exposure of 120°F ± 4°F and 95-100% relative humidity. Following exposure, the coating shall pass the Abrasion (eraser) test with no evidence of deterioration. (Reference MIL-PRF-13830B, Appendix C, para. C.4.5.8)
Salt Solubility:
The coating shall show no evidence of deterioration after being subjected to immersion for a period of 24 hours in a solution of water and 170 grams of salt per 3.8 liters of water. Following exposure, the coating shall pass the Abrasion (eraser) test with no evidence of deterioration. (Reference MIL-PRF-13830B, Appendix C, para. C.4.5.7)
Temperature Shock:
The coating shall show no evidence of deterioration after being exposed to a temperature of 160°F, then -65°F and then 160°F again for 4 hours each. Transfer time between temperatures to be minimal. Following exposure, the coating shall pass the Abrasion (eraser) test with no evidence of deterioration. (Reference MIL-STD-810, Method 503.5, Procedure 1a)
Salt fog:
The coating shall show no evidence of deterioration after exposure to a salt spray fog for a continuous period of 24 hours in accordance with ASTM B117. Following exposure, the coating shall pass the Abrasion (eraser) test with no evidence of deterioration. (Reference MIL-STD-810, Appendix C, para. 4.5.9)
Additional specifications can be integrated into design considerations including fluid exposure to solvents, fuel, cleaning fluids, and other chemicals.
Dontech’s Quality Management System is AS9100D and ISO-9001:2015 certified with TUV Rheinland of North America. We are a designer and manufacturer of optical filters, laminations, and thin film coatings for the precision optics, display, and touchscreen markets.
Since 1971, we have designed and manufactured custom components that enhance the performance of optical systems from concept to final system delivery.
