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ASTM Panel Issues 2 New Paint Standards

Wednesday, September 30, 2009

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ASTM International Committee D01 on Paint and Related Coatings, Materials and Applications has approved two new standards regarding architectural coating touch-up properties and ink stainblocking of paint systems.

Both new standards are under the jurisdiction of Subcommittee D01.42 on Architectural Coatings.
 
Touch-Up Properties

When a home is being constructed, paints are subjected to a wide variety of drying conditions, which can lead to differences in appearance between the original coat and subsequent touch-up areas after the paint has fully cured. A new standard, ASTM D7489, Practice for Evaluating Touch-Up Properties of Architectural Coatings Under Various Environmental Conditions, covers variations in color, gloss and sheen that impact the touch-up capacity of a paint.
 
ASTM D7489 brings together a variety of different testing protocols that have been used for touch-up evaluation, says committee member Douglas Mall, an architectural coatings applications and formulation development specialist with UCAR Emulsion Systems and Monomers.
 
"By using ASTM D7489, it will be easier for contractors to communicate with laboratories what conditions generated product failure, with a much better chance of the laboratory being able to replicate the failure and make changes that would correct the product deficiency," says Mall.

He also noted that the standard would be used by chemists in paint laboratories as well as technical service personnel in the field.
 
Future work on ASTM D7489 will include reproducibility and repeatability studies, especially in the area of spray application. "The next step for this standard is to develop it further as a test method, selecting more common application methods and conditions," says Mall. "We would like to get feedback on the current practice and its usefulness."
 
Ink Stainblocking

Paint companies and raw material suppliers will be able to use a new ASTM standard to assess the capability of architectural coatings for blocking ink stains from bleeding through to a topcoat. ASTM D7514, Test Method for Evaluating Ink Stainblocking of Architectural Paint Systems by Visual Assessment, represents a compilation and synthesis of methods that are currently being used to evaluate stainblocking.
 
The new standard is the result of a survey taken by Subcommittee D01.42 of various methods for measuring the stainblocking capabilities of coatings, said Neal Rogers, group leader, research and development, Cook Composites and Polymers Co.

 "The development of ASTM D7514 provides a means to critically evaluate and differentiate between different resin technologies used in the manufacture of stainblocking primers," says Rogers.
 
Rogers notes that, while ASTM has a test method for the assessment of stainblocking tannins in wood (ASTM D6686, Test Method for Evaluation of Tannin Stain Resistance of Coatings), many coatings, particularly interior paints, are applied to previously painted surfaces rather than the bare wood that is covered by ASTM D6686.
 
For technical information on the new standards, contact Douglas Mall at 919-469-6717 malldd@dow.com;  or Neal Rogers at 816-391-6279 or rogers@ccponline.com). Committee D01 will meet Jan. 17-19 in Ft. Lauderdale, Fla.

To purchase the new standards, click here.

   

Tagged categories: ASTM; Certifications and standards

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