These results may be used to compare the susceptibility of materials when exposed to this test procedure.

Microbiological susceptibility may be reflected by a number of changes including staining, weight loss, or reduction in tensile or flexural strength.

This practice may be considered an inoculation with a mixed culture of fungi and bacteria.

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 and is intended for use on material test specimens that are approximately 2 cm (3/4 in.) thick and 100 cm² (20 in²) or less. This practice may be applied to articles that do not spend the majority of their service life in soil.

1.2 A wide variety of properties may be affected by microbial attack depending on material or item characteristics. Standard methods (where available) should be used for each different property to be evaluated. This practice does not attempt to enumerate all of the possible properties of interest nor specify the most appropriate test for those properties. Test methods must, however, be appropriate to the material being tested.

1.3 It is recommended that this practice be combined with appropriate environmental exposures (for example, sunlight simulating weathering devices, the hydrolytic effects of extended aqueous contact, or extraneous nutrients) or fabrication into articles (for example, adhesive bonding of seams) which may promote microbiological susceptibility during the service life of material.

1.4 The values stated in parentheses are provided for information only.