CAR-4 is a dielectrically enhanced to air ITO coating (conductive AR) that is commonly used in high ambient light environments that require excellent optical properties and good EMI/RFI shielding.
Conductivity:
The conductivity of the coating shall be maximum 4 Ω/sq and nominal 3 Ω/sq.
Transmission and Reflectance:
The transmission of the coating shall be 88-91% and reflection shall be 1% maximum average. Transmittance values are an average over the wavelength range of 400-700nm, measured at 0°. Reflectance values are an average over the wavelength range 400-700, measured at 12° (and good over the angle range of 0° – 15°)
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)
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)
Additional specifications can be integrated into design considerations including fluid exposure to solvents, fuel, cleaning fluids, and other chemicals.
Dontech is an AS9100D and ISO-9001:2015 certified 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.