ASTM Standard helps determine enamel holdout.April 6, 2012 -
Manufacturers and developers of architectural coatings will be primary users of ASTM D7786, Test Method for Determining Enamel Holdout. Standard was developed by Subcommittee D01.42 on Architectural Coatings, part of ASTM Committee D01 on Paint and Related Coatings, Materials and Applications. According to Keith Alderfer, associate scientist, The Dow Chemical Co., and member of D01.42, enamel holdout characteristic of primer can have significant impact on appearance of finished painted system.
Standard for Determining Enamel Holdout Developed by ASTM Paint Committee
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Press release date: April 4, 2012
W. CONSHOHOCKEN, Pa., - 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.
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User comments about this story
Your question should be directed to the technical contact for this stadnard: Keith Alderfer, Dow Chemical Co., Spring House, Pa., Phone: 215-619-1542; firstname.lastname@example.org
Jeff Adkins on Jun 20, 2012 10:06
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Min.requirement test to determine non-enamel
I think this new standard is considering the strenghten of enamel topcoat vs its groundcoat; based on thermal shock; am I right ? My point and question is as follow:
My architectural panel enamel products should be tested by the Project owner as primary bidding evaluations thru enamel-testing all prototype products submitted by bidding participants.Could this ASTM use for that purpose ? If yes, what minimum spec should be done to make sure that my product is the real enamel one. (some of bidders provide non-enamel products with cheap price in making bidding process became un-fair.
Idaris D Simorangkir on Jun 20, 2012 08:27
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