American Society for Testing and Materials (ASTM). Current edition approved July 1, 2005. Published July 2005. Originally approved in 1980. last previous edition approved in 1999 as D 3926 – 80 (1999). 3 p. These test methods cover the determination of the weight percent of solids in aqueous slurries of titanium dioxide pigments by either the use of a gravity-convection oven (Method A), infrared radiation moisture analyzer (Method B), or a microwave drying system (Method C).