ASTM D7233 to Test Paintbrush Filaments
April 20, 2009 // Published as a news service by IHS
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ASTM International Committee D01 on Paint and Related Coatings, Materials and Applications approved ASTM D7233 - Test Method for Testing Fracture of Level Paintbrush Filaments, a standard that provides testing of the synthetic, hollow filaments that are used in the manufacture of lower cost paintbrushes.
ASTM D7233 was developed by Subcommittee D01.61 on Paint Application Tools.
John Feathers, chair of Subcommittee D01.61, said the low cost paintbrush market was previously served by brushes that used natural hog bristle while professional brushes were made with solid filaments.
"While the hollow filaments did provide lighter weight and cheaper manufacturing cost, they've often had quality issues, such as fracturing, when bent during painting," said Feathers.
"Failure to recover to a straight position after flexing during painting often results in filaments sticking out from the brush, resulting in poor control of the paint application," he said.
Feathers said ASTM D7233 and the equipment detailed within it will allow suppliers of hollow filaments for paintbrushes to better assess the tendency of the filaments to fracture.
"This method can be used between filament suppliers and brush manufacturers to establish an acceptable quality specification for the filaments," said Feathers. "In addition, the method is useful when developing new hollow filament cross-sectional shapes to reduce or eliminate fracture when bending."
In addition to being used by suppliers of synthetic filaments to the paintbrush market and brush manufacturers, Feathers said the standard could also apply to other markets such as those for brooms and cosmetic brushes.
Subcommittee D01.61 consists of raw material suppliers, paint sundry manufacturers, test laboratory suppliers and cooperators and general users of paint applicators. Past and current activities included the development of standards and practices for assessing quality attributes and performance of paintbrushes and rollers.
New projects for D01.61 include a proposed standard for paint pads, as well as the documentation of terminology for the industry.
Source: ASTM International.