WASHINGTON, D.C. – Subcommittee D01.44 on Traffic Coatings, part of ASTM International Committee D01 on Paint and Related Coatings, Materials and Applications, is currently working on two proposed new standards covering the sampling of waterborne traffic paint and glass bead gradation measurement.
Ensuring that traffic paint taken from the field is tested properly in laboratories is a concern of paint suppliers as well as private testing laboratories, Department of Transportation (DOT) labs, DOT striping crews and striping contractors. A proposed new ASTM standard, ASTM WK22312, Practice for Drum and Tote Sampling of Waterborne Traffic Paint, addresses laboratory sampling issues.
According to Greg Shay, Chair of Task Group D01.44.02 on Traffic Paint and Liquid Traffic Markings, testing is done for qualification or to ensure that paint of a consistent quality is being provided to state striping crews and to striping contractors. “If the sampling is not done properly, the sample may not be representative and could fail one or more specifications during testing, such as resin content or dry time,” said Shay.
Shay noted that there are two issues for field sampling of drums, totes and other traffic paint containers. “The first is that there is no common standard method being used for the sampling, and the second is that the various methods that are being used often do not provide a sample that is uniform and representative of the composite sample in the container.”
Interested parties are invited to join in the ongoing development of ASTM WK22312. “We would like to know how sampling is currently being done by the various state departments of transportation and contractors and what methods or sampling equipment are available from vendors to obtain uniform samples,” said Shay.
Glass beads added to traffic paint during manufacturing are necessary to ensure paint retroreflectivity, especially at night. A proposed new standard, ASTM WK23758, Test Method for Measuring Gradation of Glass Beads Using a Flowing Stream Digital Image Analyzer, will be useful in the production and quality control of glass beads.
“Digital camera technology combined with high-speed computers has yielded a very useful tool for determining accurate gradation analysis of glass beads,” said Gary Ware, an ASTM D01 committee member. “This proposed standard defines the first standardized test method for this application.” Ware notes that, in addition to use by manufacturers, ASTM WK23758 will allow end users of glass beads to determine conformance to the standard.
“We welcome any and all input and participation, but technical people from the manufacturers of digital image analyzers are especially needed,” said Ware.
For technical information, contact: Greg Shay (ASTM WK22312), UCAR Dow Chemical Co., Cary, NC, at 919/469.6789, e-mail shaygd@dow.com; or Gary Ware (ASTM WK23758), SWARCO America, Columbia, TN, at 931/560.4166, e-mail gary.ware@swarco.com.
ASTM International welcomes and encourages participation in the development of its standards. ASTM’s open-consensus process, using advanced Internet-based standards development tools, ensures worldwide access for all interested individuals.