Standard For Determining Enamel Holdout Developed By ASTM Paint Committee

Manufacturers and developers of architectural coatings will be the primary users of a new ASTM International standard, ASTM D7786, Test Method for Determining Enamel Holdout. The standard was developed by Subcommittee D01.42 on Architectural Coatings, part of ASTM International Committee D01 on Paint and Related Coatings, Materials and Applications.

Keith Alderfer, associate scientist, The Dow Chemical Co., and a member of D01.42, says that enamel holdout is an important attribute of an architectural primer.

"The enamel holdout characteristic of a primer can have a significant impact on the appearance of the finished painted system, especially if that system is intended to have a semigloss or glossy finish," says Alderfer. "Semigloss topcoats over primers with poor enamel holdout characteristics or unprimed porous substrates can result in lower gloss than is intended from the final coating."

While ASTM D7786 is now complete, Alderfer says that interested participants are invited to join in interlaboratory testing on the standard that is planned to begin this year.

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ASTM Committee D01 Next Meeting: June 24-26, in conjunction with the D02 June meeting, San Francisco, Calif.

SOURCE: ASTM International standard