ASTM D8008-20 PDF Download

ASTM D8008-20 is a standard practice that provides guidelines for obtaining representative field samples of traffic paints for quality assessment and approval purposes. The practice emphasizes the importance of correct sampling techniques to ensure accurate evaluation of the paint's specifications. Various tests, such as solids content, resin content, TiO2 content, heat-age stability, freeze-thaw stability, and dry time, may be affected if the sampling is not conducted properly.

The standard applies to both mixed and unmixed waterborne, solventborne, or other liquid traffic paints stored in drums, totes, or machine striping tanks. Paint suppliers or government agencies often take samples from these containers for laboratory testing to determine the quality of the product or seek approval before striping. It is crucial that the samples taken reflect the overall composition of the container, as some paints may stratify over time and become non-homogeneous. Thorough mixing of the sample until homogeneous is the desired method, with sampling from the top. If complete mixing cannot be verified, an alternative practice is using a liquid tube sampling device, such as an inner or outer rod tube sampler.

It is important for the parties involved in the supply and testing of the traffic paint to agree on the practice selected for representative sampling in writing. This ensures a standardized and consistent approach in obtaining samples and evaluating the product's quality.