American Society for Testing and Materials (ASTM). Current edition approved May 15, 2005. Published June 2005. Originally approved in 1991. Last previous edition approved in 1997 as D 5125 – 97. 8 p. This test method covers the determination of the flow time (viscosity) of Newtonian and near-Newtonian paints, and related coatings and products using ISO capillary flow cups.