Requirements for coating thickness according to ASTM A123

Steel category (Not centrifuged)	Minimum average coating thickness
	Steel thickness 0.76 mm to under 1.60 mm	Steel thickness 1.60 mm to under 3.20 mm	Steel thickness 3.20 mm to under 4.80 mm	Steel thickness 4.80 mm to under 6.40 mm	Steel thickness 6.40 mm or over
Structural shape	45	65	85	85	100
Strip	45	65	75	85	100
Pipe	-	-	75	75	75
Wire	45	45	65	65	85
Remark: The table values for specimen test

Requirements for coating thickness according to BS729

Steel category	Minimum average coating weight for any individual test area, g/m²
Steel articles which are not centrifuged 5 mm. thick and over 2 mm to under 5 mm thick 1 mm to under 2 mm thick	610 (85) 460 (64) 335 (47)
Grey and malleable iron casting	610 (85)
Thread work and other articles which are centrifuged	305 (43)
Remark: 1 g/m² = 0.14 (305 g/m² = 1 oz/ft² = 43 )

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