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ASTM International is proposing a new architectural paint and stain test method aimed at standardizing testing for dirt repellency across the industry.
Coating suppliers and manufacturers will be the primary users of ASTM WK38233, Test Method for Dirt Pick-Up Resistance for the Films of Architectural Paints and Stains, which will combine various existing in-house methods for testing dirt pick-up resistance, according to ASTM.
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Paint Quality Institute |
| Paints differ greatly in their ability to repel dirt, dust particles and other debris. The new standard is designed to standardize methods for testing dirt repellency. |
The proposed standard is being developed by Subcommittee D01.42 on Architectural Coatings, part of ASTM International Committee D01 on Paint and Related Coatings, Materials and Applications.
Standard Highlights
The proposed standard relates to testing of a paint’s ability to resist the accumulation of dirt, dust particles, and other debris. Usually, dirt pickup is caused by soil splashing onto siding or results from air pollution, car exhaust, and 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.
The subcommittee is inviting all interested parties to participate in the standard’s development.
“We are particularly interested in participation from those who already have in-house dirt pick-up test methods with formulated dirt,” says Andrews. “We are also looking for participation from anyone who has interest in appropriate accelerated methods, such as artificial UV and water conditioning.”
Other Standards Underway
In addition to its work on ASTM WK38233, the Subcommittee on Architectural Coatings is currently working on:
• Revising ASTM D4446, Test Method for Anti-Swelling Effectiveness of Water-Repellent Formulations and Differential Swelling of Untreated Wood When Exposed to Liquid Water Environments; and
• Developing another new standard, ASTM WK32143, Test Method Visual Assessment of Water Beading on Horizontal Coatings.
One of the world’s largest international standards development and delivery systems, ASTM welcomes participation in the development of its standards.
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