MIL-C-85285 is the specification for which coating?

• A. Silicone sealant
• B. Epoxy resin
• C. Polyester enamel
• D. Aliphatic polyurethane, MIL-C-85285

Answer: (D)

The coating specified by MIL-C-85285 is an aliphatic polyurethane coating. This designation identifies a protective exterior coating system based on aliphatic polyurethane resins, chosen for their superb UV stability, color and gloss retention, and overall durability on military equipment and aircraft.

Why this is the best fit: aliphatic polyurethane coatings resist sunlight and environmental weathering much better than many other resins, so they maintain appearance and protection over time. That makes them ideal for exterior surfaces that must endure sun exposure, rain, and abrasion.

Silicone sealant isn’t a coating for corrosion protection; it’s used mainly as a joint sealant. Epoxy resin coatings are a different class with their own specifications and performance characteristics, often chosen for corrosion resistance but not the same UV stability as aliphatic polyurethanes. Polyester enamel is a separate coating family with different properties and standards. The MIL-C-85285 specification specifically targets the aliphatic polyurethane coating system.