ISO 19840:2012

Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces

Publication date:   Aug 22, 2012

General information

90.60 Close of review   Sep 3, 2022


ISO/TC 35/SC 14 Protective paint systems for steel structures

International Standard

87.020   Paint coating processes



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ISO 19840:2012 specifies a procedure for the verification of dry-film thickness against nominal dry-film thickness on rough surfaces, including the adjustment of the instruments used, the definition of inspection areas, sampling plans, measurement methods and acceptance/rejection criteria.
The procedure is based on the use of instruments of the permanent magnet, electromagnet and eddy current type. Instrument accuracy is verified both at zero and at a known thickness on a smooth surface and adjusted if necessary.
It does not apply to nominal dry-film thicknesses less than 40 µm.

Life cycle


ISO 19840:2004


ISO 19840:2012
90.60 Close of review
Sep 3, 2022