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SSPC Revises DFT Standard

Monday, July 2, 2012

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SSPC has announced that it has made technical revisions and editorial clarifications to its coating application standard, SSPC-PA 2, Procedure For Determining Conformance To Dry Coating Thickness Requirements.

PA 2 was first released in 1973 and has received several editorial updates since. The latest technical updates were effective May 1, 2012, SSPC reports.

 The latest revision of SSPC-PA 2 for measuring dry film thickness includes new descriptions for determining and documenting non-conforming areas.


The latest revision of SSPC-PA 2 for measuring dry film thickness includes new descriptions for determining and documenting non-conforming areas.

SSPC-PA 2 describes a procedure for determining shop or field conformance to a specified coating dry film thickness (DFT) range on ferrous and non-ferrous metal substrates using nondestructive coating thickness gages (magnetic and electronic) described in ASTM D7091, Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals.

PA 2 defines a procedure to determine whether dry coatings conform to the minimum and the maximum thickness specified.

Technical Revisions

According to SSPC, some of the technical revisions to PA 2 include

• The elimination of descriptions of gages and their operation, which will be included in the upcoming revision of the ASTM D7091;

• The re-writing of Section 9 on determining compliance with specified DFT to allow the specifier to reference a greater or lesser “coating thickness restriction” than the default requirement;

• The addition of new language for determining and documenting the extent of nonconforming areas (found in Section 8.2.4 and subsections);

• The modification of the nonmandatory note on overcoating to allow the use of ultrasonic gages that have the ability to distinguish coating layers for measurement of DFT on overcoated structures; and

• The addition of two new non-mandatory appendices—one for measuring the DFT of coatings on edges and the other for measuring DFT on coated steel pipe exteriors.

Other revisions are considered editorial clarifications, SSPC says.

KTA-Tator’s Bill Corbett, who chaired the committee that undertook revising PA 2, said, “SSPC’s Paint Application Standard No. 2 is one of the most widely referenced standards in the protective coatings industry. As Chair of SSPC Committee C.3.2 - Coating Thickness Measurement, I am pleased with the content and organization of the newly revised standard, and want to acknowledge all those on the committee who put considerable thought into how the document could be made more clear and more useful to the industry. Note also that ASTM Subcommittee D01.23, responsible for revising standard practice D7091 in 2010/2011 (published in 2012), did their work in concert with the revisions to PA 2 so that the documents would complement, and not conflict with one another. This is an excellent example of how standards writing organizations can work together for the good of the industry. The SSPC Committee is confident that SSPC membership and the industry as a whole will benefit from the improvements made to the PA 2 standard.”

For more information, contact SSPC’s Aimee Beggs: 877.281.7772, ext. 2223; The standard is also available for purchase.

Upcoming JPCL/SSPC Webinar on PA 2

In addition to chairing the committee in charge of the revision, Bill Corbett also will present the JPCL/SSPC Webinar, New PA 2: Procedure for Determining Conformance to Dry Coating Thickness, to be held October 17, 2012, from 11:00 to noon EST. Interested individuals can register here or get more information on upcoming JPCL/SSPC webinars.


Tagged categories: Certifications and standards; Coating / Film thickness; Dry Film Thickness (DFT); Metals; Paint application; SSPC; Thickness gauge

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