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IS 6746:2003 is the Indian Standard (BIS) for method for measurement of coating thickness by magnetic method (non-destructive). IS 6746 provides the standard method for measuring coating thickness using magnetic gauges (DFT gauges). This is the most commonly used non-destructive method for checking paint DFT, zinc plating thickness, galvanizing thickness, and any non-magnetic coating on steel.
Method for non-destructive measurement of thickness of non-magnetic coatings on magnetic substrates (e.g., zinc, paint, chrome on steel) using magnetic gauges.
Overview
Status
Current
Usage level
Frequently Used
Domain
Materials Science — Testing Methods and Quality Control
What coatings can be measured with magnetic gauges?+
Any non-magnetic coating on a magnetic (steel/iron) substrate: paint, zinc plating, galvanizing, chrome, nickel, powder coating, enamel, plastic coating. Cannot measure magnetic coatings or coatings on non-magnetic substrates (aluminium, stainless).
How many readings are needed?+
IS 6746 recommends minimum 5 readings per measurement spot, averaged. For large areas, measure on a grid pattern. Discard obviously outlier readings.