1.1 These test methods cover procedures for testing cellulose acetate. 1.2 The test procedures appear in the following sections: Sections Ash  8 to 11 Color and Haze 67 to 72 Combined Acetyl or Acetic Acid Content  Test Method A. Solution Method 17, 19 to 23  Test Method B. Heterogeneous Saponification Method 17, 24 to 26 Free Acidity 12 to 16 Heat Stability 47 to 56 Hydroxyl Content 27 to 33 Intrinsic Viscosity 57 to 62 Moisture Content  4 to 7 Primary Hydroxyl Content 34 to 39 Sulfur or Sulfate Content 40 to 45 Viscosity 63 to 66 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.