Pretreatment. The front and back surfaces of all sign blanks shall be cleaned, deoxidized, and coated with a light, tightly adherent chromated conversion coating free of any powdery residue. Pretreatment shall be performed in accordance with Section 5 of ASTM B 449. The coating weight shall be class 2 (10-34mg/sf) with a median weight of 25mg/sf as the optimum.
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Sources: Contract Resulting From Invitation to Bid, Contract Resulting From Invitation to Bid