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Methods of sampling and testing retroreflective materials and devices for road traffic control purposes – Raised pavement markers (retroreflective and non-retroreflective) – Glaze/coating thickness standard by Standards Australia, 01/01/1982
AS 2445.3.9 sets out the method for determining the glaze thickness of ceramic markers, or the coating thickness of ferrous-based markers of Type A and Type A/B.