【国外标准】 Standard Test Methods of Testing Cellulose Acetate Propionate and Cellulose Acetate Butyrate

7.1 Ash content gives an estimate of the inorganic content of cellulose ester samples. The presence of high levels of inorganic content (ash) can be detrimental to the melt stability and optical clarity of a cellulose ester in melt processing or act as a potential source of insolubles when the ester is used in solution.1.1 These test methods cover procedures for the testing of cellulose acetate propionates and acetate butyrates. These esters may vary widely in composition and properties, so certain of the procedures can be used only in the ranges of composition where they are suitable.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 The test procedures appear in the following sections:  SectionsAcetyl Propionyl or Butyryl Contents 28 – 37Acetyl Content, Apparent 18 – 27Acidity, Free 12 – 17Ash  7 – 10Color and Haze 77 – 81Heat Stability 57 – 65Hydroxyl Content 38 – 44Hydroxyl Content, Primary 46 – 50Intrinsic Viscosity 67 – 71Moisture Content  5-6Sulfur or Sulfate Content 51 – 56Viscosity 74-75Limiting Viscosity Number 67 – 711.4 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.