1.1 这些试验方法包括醋酸丙酸纤维素和醋酸丁酸酯的试验程序。这些酯的组成和性质可能差异很大，因此某些程序只能在合适的组成范围内使用。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 测试程序见以下章节: 小节 乙酰丙酰基或丁酰基含量 28 – 37 乙酰基含量，表观 18 – 27 酸度，游离 12 – 17 灰 7 – 10 颜色和雾度 77 – 81 热稳定性 57 – 65 羟基含量 38 – 44 初级羟基含量 46 – 50 特性粘度 67 – 71 含水量 5. - 6. 硫或硫酸盐含量 51 – 56 粘度 74 - 75 极限粘度值 67 – 71 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 7.1 灰分含量估算了纤维素酯样品的无机物含量。高水平无机物含量（灰分）的存在可能有害于熔融处理中纤维素酯的熔体稳定性和光学透明度，或在溶液中使用酯时作为不溶物的潜在来源。

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: Sections Acetyl Propionyl or Butyryl Contents 28 – 37 Acetyl Content, Apparent 18 – 27 Acidity, Free 12 – 17 Ash 7 – 10 Color and Haze 77 – 81 Heat Stability 57 – 65 Hydroxyl Content 38 – 44 Hydroxyl Content, Primary 46 – 50 Intrinsic Viscosity 67 – 71 Moisture Content 5 - 6 Sulfur or Sulfate Content 51 – 56 Viscosity 74 - 75 Limiting Viscosity Number 67 – 71 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. ====== Significance And Use ====== 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.