Where more than one test method or testing condition is listed for the same characteristic in this index, selection of the methods and conditions to be followed must be governed by experience and the requirements in each individual case, together with agreement between the purchaser and seller. The user of this standard must be cautioned that results obtained by different test methods and different conditions of test are not directly comparable.

1.1 This index is provided for reference to aid in the selection of procedures and test methods used in the evaluation of sheet and liquid roofing materials, as appropriate. Composition specifications and analytical methods in general, as well as tests on raw materials, are not included, the scope being limited to procedures used in the evaluation of the materials as received or as finished materials or coatings.