Laser Gold plating hardness can exceed 180 on the Knoop scale when measured by the diamond-indenter method of ASTM-B-578-87. Laser Gold passes the 50-rub test of Mil-O-13830, and paragraph 3.8 and 4.4.5 of Mil-M-13508. It will withstand judicious (procedurally controlled) cleaning…indefinitely.
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