Measuring Zinc Coating Thickness of Hot-dip Galvanized Steel
Coating thickness is tested by using a magnetic thickness gauge. There are three types of magnetic thickness gauges: pencil-style, banana-style, and electronic. Electronic thickness gauges are the most common and the most accurate. Information on how to measure the thickness with magnetic gauges is contained in ASTM E376, and the minimum coating thicknesses and sampling requirements are contained in the appropriate specification for the product (ASTM A123, A153, or A767). A single measurement of coating thickness is not sufficient to evaluate whether the galvanized coating adheres to the specification (ASTM A123, A153, A767) requirements. Each specification calls out sampling size and averaging techniques to develop a true picture of compliance.
Correct Method for Zinc coating thickness measurement
I’m looking for information on thichness specification. I’m told we have G60 on our posts. What does that mean?
G60 is a coating thickness designation used for galvanized sheet products. The American Galvanizers Association (AGA) specializes in batch hot-dip galvanizing, where the steel is fabricated and then cleaned and dipped into a kettle of molten zinc. Galvanized sheet goes through an entirely different process.
There is a trade organization named the Galv Info Center who specializes in galvanized sheet and they are the appropriate people to talk with concerning G60 and other ‘G-series’ coating questions. Their website is www.galvinfo.com and their phone number is 888-880-8802.
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