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Major Revision to Popular Paint Standard Completed

A major change has been made to ASTM D 2486, Standard Test Methods for Scrub Resistance of Wall Paints, a procedure that determines the resistance of wall paints to erosion caused by scrubbing.

“In the newly introduced ‘Method B’ to D 2486, rather than the scrub resistance of one paint, two paints are drawn down simultaneously. One is generally a control or reference paint,” said Tom Sliva, vice president and technical director, DL Labs, New York, N.Y.

Operating within ASTM Subcommittee D01.42 on Architectural Coatings a team of chemists, manufacturers, suppliers and users, led by Sliva, updated the test method. “The reproducibility of D 2486 has always been poor and the manufacturers of the scrub brushes used in the method have changed their suppliers of bristles, thus there were problems correlating results from the older stiffer brushes to the new brushes,” he explained. “Since in this method we will run a reference or control paint with a known value, a better and more real scrub-resistance value can be determined. Also, by using the same control paint, results from laboratory to laboratory can be made more consistent.”

D 2486 is typically used for commercial and residential applications, and at times as a wet-abrasion test for industrial coatings. “It has been one of the most widely used paint test methods since its inception in 1966,” Sliva said.

For further technical information, contact Thomas Sliva, DL Labs, 116 E. 16th St., New York, NY 10003 (212/777-4445; fax: 212/5058419). Committee D01 meets Jan. 21-24 in Ft. Lauderdale, Fla. For meeting or membership details, contact D01 Staff Manager Tim Brooke, ASTM (610/832-9729). //

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