1.1 本试验方法包括测定模压或层压酚醛产品中丙酮可溶物的含量。 1.2 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.3 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。 注1: 该试验方法类似于ISO 308 1.4 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 对于模压酚醛产品，丙酮萃取应仅视为通常与固化程度相关的性能的定量表达。良好固化件的最佳机械和电气性能与丙酮测试的数值之间没有明显的严格关系。 丙酮可溶物的量受以下因素影响:( 1. )树脂和填料的性质( 2. )润滑剂( 3. )成型温度( 4. )固化长度( 5. )取样截面的厚度( 6. )模塑件的性质( 7. )用于成型的技术( 8. )待提取材料中的细粒分布，以及( 9 )研磨试样的方法。在某些情况下，这些变化将导致3到4的差异 % 丙酮萃取物中。因此，试验方法只能用作测量咬边的比较试验。 4.2 对于层压酚醛产品，丙酮萃取表示固化阶段的变化、树脂含量的变化、所用树脂类型的变化、增塑剂或其他丙酮的存在- 可萃取添加剂，通常受中所述相同因素的影响 6.1

1.1 This test method covers the determination of the amount of acetone-soluble matter in molded or laminated phenolic products. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.3 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. Note 1: This test method is similar to ISO 308. 1.4 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 For molded phenolic products, acetone extraction shall be considered solely as a quantitative expression of a property normally associated with degree of cure. There is no demonstrably rigorous relation between the optimum mechanical and electrical properties of a well-cured piece and the numerical value of the acetone test. The amount of acetone-soluble matter is affected by: ( 1 ) nature of resin and filler, ( 2 ) lubricant, ( 3 ) molding temperature, ( 4 ) length of cure, ( 5 ) thickness of the section from which sample is taken, ( 6 ) nature of molded piece, ( 7 ) technique used in molding, ( 8 ) distribution of fines in the material to be extracted, and ( 9 ) method of grinding the specimen. These variations under some conditions will cause a difference of 3 to 4 % in acetone-extractable matter. For this reason, the test method shall be used only as a comparative test for measuring undercure. 4.2 For laminated phenolic products, acetone extraction indicates change in stage of cure, change in resin content, change in type of resin used, presence of plasticizers or other acetone-extractable addition agents, and is affected in general by the same factors as stated in 6.1