MIL-C-675C

This specification establishes the durability and abrasion resistance requirements of anti-reflection interference films used on optical materials. Optical components cannot show signs of deterioration or abrasion after each of the following tests:

REQUIRED

• Salt Solubility – Coated optical components are immersed in a saline solution for 24 hours
• Humidity – Components are exposed to an atmosphere of 120° ± 4° and 95 to 100% relative humidity
• Salt Spray Fog – Components are exposed to a salt spray fog for 24 hours
• Severe Abrasion – A MIL-E-12397 compliant eraser is rubbed over the coated surface for 20 complete cycles (40 strokes)
• Moderate Abrasion – Coated optical components are rubbed with a cheesecloth pad for 25 cycles (50 strokes)
• Adhesion – A 1/2″ wide strip of cellophane tape is pressed against the coated surface and quickly removed

MIL-C-48497A

This specification establishes the durability requirements for single-layer and multilayer interference coatings used on optical materials.
Optical components cannot show signs of deterioration or abrasion after each of the following tests:

REQUIRED

• Adhesion – A 1/2″ wide strip of cellophane tape is pressed against the coated surface and quickly removed
• Humidity – Components are exposed to an atmosphere of 120° ± 4° and 95 to 100% relative humidity
• Moderate Abrasion – Coated optical components are rubbed with a cheesecloth pad for 25 cycles (50 strokes)
• Temperature – Components are exposed to temperatures of -80° and +160° for 2 hours at each temperature
• Solubility and Cleanability – Coated components are immersed in trichloroethylene, acetone, and ethyl alcohol and wiped with cheesecloth

OPTIONAL

• Severe Abrasion – A MIL-E-12397 compliant eraser is rubbed over the coated surface for 20 complete cycles (40 strokes)
• Salt Solubility – Coated components are immersed in a saline solution for 24 hours
• Water Solubility – Coated components are immersed in distilled water

MIL-M-13508C

This specification establishes the durability requirements for a mirror coating consisting of a deposited aluminum reflective film overlaid with a transparent dielectric protective film.
Optical components cannot show signs of deterioration or abrasion after each of the following tests:

REQUIRED

• Temperature – Components are exposed to temperatures of -80° and +160° for 2 hours at each temperature
• Adhesion – A 1/2″ wide strip of cellophane tape is pressed against the coated surface and quickly removed
• Moderate Abrasion – Coated optical components are rubbed with a cheesecloth pad for 25 cycles (50 strokes)

OPTIONAL

• Humidity – Components are exposed to an atmosphere of 120° ± 4° and 95 to 100% relative humidity
• Salt Spray – Components are exposed to a salt spray