W. CONSHOHOCKEN, PA – ASTM International has announced several new proposed standards being developed by subcommittees of ASTM Committee D01 on Paint and Related Coatings, Materials and Applications.

ASTM WK 30920, Guide for Corrosion Test Panel Preparation and Rating of Coil-Coated Building Products, is being developed by Subcommittee D01.53 on Coil Coated Metal. According to Ted Best, a scientist with Valspar Corp. and D01.53 member, the standardization of test panel configurations and ratings would allow benchmark comparisons across a broad range of products that includes substrates, pretreatments and coatings.

ASTM WK 33642, Test Method for Measurement of Viscosity of Paints, Inks or Related Liquid Materials as a Function of Temperature, is being developed by Subcommittee D01.24 on Physical Properties of Liquid Paints and Paint Materials.

“It is useful to know the extent of variation, but we do not know of any ASTM standard that establishes the viscosity-temperature variation for these materials,” said Clifford Schoff, Ph.D., Schoff Associates, and Chairman of D01.24. “The relationship has important implications for viscosity measurement in general and specifically for processes such as hot spray and for sagging and leveling on baking.”

The proposed standard will give instruction on how to prepare a viscosity-temperature table or curve. This will be useful when ambient conditions do not allow the measurement at the exact temperature stated in a specification or regulation.

Schoff says D01.24 welcomes interested parties to join in the ongoing revision of the ASTM WK 33642 draft and also to participate in interlaboratory testing to establish the precision of the proposed standard. In addition to ASTM WK 33642, the subcommittee is also beginning work on a standard for measuring the yield stress of paints, ink and related liquids. Participants are sought for this activity as well.

Another new proposed ASTM International standard is ASTM WK 32143, Test Method for Visual Assessment of Water Beading on Horizontal Coatings, being developed by Subcommittee D01.42 on Architectural Coatings. It will provide formulators with a practical means for evaluating the water beading capability of a coating. Repeating the test described in ASTM WK 32143 after coated specimens have been put through intervals of aging or weathering will demonstrate the persistence of the coating’s ability to bead water.