The adhesion grade classification for anti-rust coatings on urban outdoor metal furniture is typically measured using standardized methods like ASTM D3359. This test evaluates how well the protective coating bonds to the metal substrate through cross-cut tape tests, with ratings ranging from 0B (complete peeling) to 5B (no peeling). For outdoor furniture exposed to weather elements, a minimum rating of 4B is generally required, where less than 5% of the coating is removed during testing. Higher grades (5B) indicate superior adhesion, ensuring long-term rust prevention and durability. Factors affecting adhesion include surface preparation, coating thickness, and environmental conditions. Proper adhesion prevents moisture penetration and structural corrosion, extending the furniture's lifespan in urban outdoor settings.
What is the grade classification for the adhesion of the anti-rust coating of urban outdoor metal furniture?
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