1.1 本试验方法涵盖高模量纤维密度的测定，适用于连续和不连续纤维。 1.2 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本标准可能涉及危险材料、操作和设备。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。 参见第节 9 了解更多信息。 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====== 5.1 纤维密度有助于在研发水平上评估新材料，也是纤维规范中通常给出的材料特性之一。 5.2 纤维密度用于确定纤维束和单丝的纤维强度和模量。这些特性基于有效面积上的荷载或模量斜率。 纤维密度可与纤维的线性质量一起使用，以给出有效牵引面积的近似值。丝束面积除以丝束中的平均灯丝数，得出单个灯丝有效面积的近似值。 5.3 在根据钢筋质量和层压板密度确定钢筋体积和空隙体积时，纤维密度用作组成特性。

1.1 This test method covers the determination of the density of high-modulus fibers and is applicable to both continuous and discontinuous fibers. 1.2 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard may involve hazardous materials, operations, and equipment. 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. See Section 9 for additional information. 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 ====== 5.1 Fiber density is useful in the evaluation of new materials at the research and development level and is one of the material properties normally given in fiber specifications. 5.2 Fiber density is used to determine fiber strength and modulus of both a fiber bundle and an individual filament. These properties are based on load or modulus slope over an effective area. Fiber density may be used with lineal mass of the fiber to give an approximation of effective tow area. Tow area divided by the average number of filaments in a tow gives an approximation of the effective area of an individual filament. 5.3 Fiber density is used as a constituent property when determining reinforcement volume and void volume based on reinforcement mass and laminate density.