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Military Specifications

MIL-C-675C

GroupingsThis 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 cheese cloth 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 cheese cloth 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
Groupings Lenses

MIL-M-13508C

This specification establishes the durability requirements for a mirror coating consisting of a deposited aluminum reflective film overlaid with a transparent dielectic 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 cheese cloth 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 – Componenets are exposed to a salt spray