1.1 ,This practice is limited to the method of conducting an evaluation of a nonmetallic material's microbiological susceptibility when in contact with the natural environment of the soil under use conditions. This practice is intended for use on solid material test specimens that are no larger than approximately 2 ,cm (0.79 ,in.) thick and 100 ,cm 2 (15.5 ,in.2) or on film forming materials such as coatings which may be tested in the form of films at least 50 by 50 ,mm (2 by 2 ,in.) in size. This practice may be applied to articles that do not spend the majority of their service life in soil.