ASTM International is proposing a new architectural paint and stain test method intended to standardize testing for dirt repellency throughout the industry. Once approved, the standard is expected to be useful for coating suppliers and manufacturers.
According to the American Coating Association, the proposed standard, ASTM WK38233, Test Method for Dirt Pick-Up Resistance for the Films of Architectural Paints and Stains, is currently being developed by Subcommittee D01.42 on Architectural Coatings, part of ASTM International Committee D01 on Paint and Related Coatings, Materials and Applications.
The proposed standard relates to testing a paint’s ability to resist the accumulation of dirt, dust particles, and other debris that are often caused by soil splashing onto siding or from air pollution, car exhaust, or flying dust collecting on a house’s body or trim. Flat paints are more prone to dirt pickup and entrapment.
According to Amanda Andrews, a chemist with Wacker Chemical Corp., and a D01.42 member, the proposed standard will focus on standardizing a dirt composition, how to apply dirt, the removal of dirt, and a rating technique for an exterior coated substrate compared to many years of outdoor exposure.
Interested parties are invited to participate in the ongoing development of ASTM WK38233. "We are particularly interested in participation from those who already have in-house dirt pick up test methods with formulated dirt," said Andrews. "We are also looking for participation from anyone who has interest in appropriate accelerated methods such as artificial UV and water conditioning."
In addition to its work on ASTM WK38233, D01.42 is currently working on a revision to ASTM D4446, Test Method for Anti-Swelling Effectiveness of Water-Repellent Formulations and Differential Swelling of Untreated Wood When Exposed to Liquid Water Environments, as well as another proposed new standard, ASTM WK32143, Test Method for Visual Assessment of Water Beading on Horizontal Coatings