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FVMQ tops out near 200°C / 392°F and FKM holds 250°C / 480°F longterm: see the fuel, tear strength, and cold soak…
Fluorosilicone coating hardens above 200°C / 392°F while GREOS ENDURE FKM coating holds 250°C / 480°F with flexibility fluorosilicone can't match.
Radar absorbing materials only hold their tuned RCS answer if the topcoat above them survives thermal cycling. See where polyurethane and silicone…
Compare aerospace manufacturing coatings by chemistry and failure mode, and see which ASTM and MIL-STD tests qualify FKM coatings for 250°C hot…