http://www.jrmetalframes.com/Frame-Fire-Rating/HMMA-850-Fire-Rating-Information.pdf WebDunbarton’s hollow metal comes standard with A40 zinc-coated galvannealed steel that combined with our factory paint system give maximum rust protection. The Dunbarton factory-applied paint finish meets or exceeds 500 hour salt spray test per ASTM–B117-97.
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