1.1 This test method can be used as an index test to determine the mass per unit area of all erosion control blankets (ECBs). 1.2 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.2.1 The method used to specify collection, calculation, or recording of data in this test method is not directly related to the accuracy to which the data can be applied in design or other uses or both. Application of the results obtained using this test method is beyond its scope. 1.3 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.