BS EN 16602-70-17:2020 pdf free.Space product assurance一Durability testing of coatings and surface finishes. BS EN 16602-70-17 This standard specifies requirements for the durability testing of coatings most commonly used for space applications, i.e.Thin film optical coatings Thermo-optical and thermal control coatings (the majority are paints,metallic deposits and coatings for stray light reduction) Metallic coatings for other applications (RF， electrical, corrosion...