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/ Coating Performance Example – CAR-4

Coating Performance Example:

CAR-4 on soda lime glass

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.

PERFORMANCE PROPERTIES

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.

CAR-4 Coating Performance Curves:

 

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