1.1 本试验方法描述了对各种纤维素衍生物溶液进行球滴粘度测量的仪器和一般程序。有关样品制备、溶液浓度和其他细节的说明，请参见ASTM方法中有关纤维素衍生物的说明。 1.2 本试验方法适用于使用不同直径和密度的球制备粘度大于10 P的各种纤维素衍生物溶液。粘度结果最好用泊表示。 1.3 在商业实践中，粘度通常用2.38-mm表示为秒( 3. / 32 -英寸。）不锈钢球。 2. 当粘度超出这些球的实际范围（75至300 P）时，可以使用校准的移液管粘度计或不同的球进行测量，并将观察到的粘度计算到2的相应时间。 38毫米( 3. / 32 -英寸。）球，即使它是一秒钟的一小部分。 1.4 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。 1.5 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。 1.6 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====== 4.1 该试验提供了一种测定纤维素衍生物在给定溶剂中粘度的简单方法。 答案以工业实践中常用的单位表示。对于要按原样或溶液挤压、模制、喷涂或刷涂的纤维素衍生物，需要此类信息。

1.1 This test method describes the apparatus and general procedure for making ball-drop viscosity measurements on solutions of various cellulose derivatives. Instructions for sample preparation, solution concentration, and other details are discussed in the ASTM methods for the respective cellulose derivatives. 1.2 This test method is applicable to solutions of various cellulose derivatives having viscosities greater than 10 P, by using balls of various diameters and densities. Viscosity results are expressed preferably in poises. 1.3 In commercial practice, viscosities are often expressed in seconds using 2.38-mm ( 3 / 32 -in.) stainless steel balls. 2 When the viscosity is outside the practical range for these balls (75 to 300 P), the measurement can be made using a calibrated pipet viscometer or a different ball and calculating the observed viscosity to the corresponding time for a 2.38-mm ( 3 / 32 -in.) ball, even though it is a small fraction of a second. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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. 1.6 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 ====== 4.1 This test provides an easy method of determining the viscosity of cellulose derivatives in a given solvent. The answers are in units commonly used in industrial practice. Such information is needed for cellulose derivatives that are to be extruded, molded, sprayed, or brushed as is or in solution.