This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. Related. In nearly the same timeframe, the version of ASTM D, “Standard Practice for Nondestructive Measurement of Dry Film Thickness of. ASTM D describes three operational steps that must be performed prior to coating thickness measurement to help assure the reliability of.

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Click Here to Read the Updated Article. A minimum and a maximum thickness are normally specified for each layer of coating.

Measuring Dry Film Coating Thickness According to SSPC-PA 2

Measurements to Determine Conformance to a Specification. The base metal reading is measured, recorded and deducted from the thickness of each coat, in order to correctly state the thickness of the coating over the surface roughness.

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Aastm measured distance is displayed as coating thickness by the gages. Use of the gage outside of this range may generate false coating thickness measurements and may damage the instrument.

Provisions for measuring on soft or tacky coatings are described in 5. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. These gages are s7091 as “magnetic pull-off” and “electronic. The total number of spot and area measurements is based on the total square footage of pipe on the cart or rack.


The BMR is deducted from the coating thickness values, in order to report the thickness of the coating layer s over the surface pro? Additionally, most manufacturers of high performance coatings will warranty coating systems based upon, in part, achieving the proper thickness of each layer and the total coating system. Otherwise the reliability of the gage is x7091. I am assuming you are using c7091 electronic gage:.

The number of areas that must be measured for coating thickness varies, depending on the size of the coated area. Pipe spools that are not loaded onto a rack or cart are typically measured individually Figure The operating principle is quite simple.

Measuring Dry Film Coating Thickness According to SSPC-PA 2KTA University

SSPC-PA 2 states that a minimum of 10 locations arbitrarily spaced should be measured one reading per locationthen averaged.

The revisions took five years to complete. SSPC-PA 2 has undergone significant changes in an attempt to make the standard more complete, in concert with ASTM D, easier to perform in the shop and field, and to provide the specifier with options for coating thickness restrictions based on the type of structure, the coatings to be applied and the service environment.

The user should consult the manufacturers instructions regarding the use of coating thickness gages on these types of coatings. However, because Type 1 gages are non-linear, one cannot assume a linear mil-for-mil correction value across the full range of the gage.

These steps are incorporated by reference in SSPC-PA d70991 and are completed before obtaining coating thickness measurements to determine conformance c7091 a specified coating thickness range.


This standard was published in and will require updating to reflect current technology. It includes definitions of key terms, reference documents, the significance and use of the practice, the advantages and limitations of coating thickness gages, and a description of test specimens.

Test Method D should be referenced for this application. The arithmetic mean of these values becomes the Base Metal Reading. Dry film thickness gages are calibrated by the equipment manufacturer, its authorized agent, or an accredited calibration laboratory under controlled conditions. The two documents are designed to be used in conjunction with each another.

Then I calibrated by keeping the same on a metal surface, which resulted in a 0. The average of the three acceptable gage readings is the spot measurement. Even if a project speci?

For the purpose of final acceptance of the total DFT, the cumulative thickness of all coating layers in each area must be no less than the cumulative minimum specified thickness and no greater than the cumulative maximum specified thickness.

Acquisition of more than three gage readings within a spot is permitted. While some gage operators may simply subtract a fixed amount for example, 0. A minimum thickness and a maximum thickness are normally specified for each layer of coating.

NOTE 3—Coatings should be applied in accordance with Practices D or as agreed upon between the contracting parties.