1.1 这些试验方法包括两种测定亚麻纤维密度的程序，适用于任何长度的纤维。 1.1.1 试验方法A-气体比重计- 这是更精确的密度测量方法，在可以应用样本调节（烘箱干燥）或可以通过吹扫设置减轻放气影响的情况下，这是首选方法。测试方法的准确性水平可以从精度和偏差表中评估。可以通过对样品进行吹扫循环、加压和压力稳定性检查来评估放气效果。 如果隔离样品室中的压力增加，放气可能会影响结果的准确性。烘箱干燥样本低于55 ºC至平衡，0 % 相对湿度（RH）环境或使用更长的吹扫方法，或两者兼有，以消除放气影响。 1.1.2 试验方法B-浮力（阿基米德）法- 在精度和偏差表中显示的精度较低的应用中，这可以作为测试方法A的替代方法。如果无法通过烘箱干燥或吹扫设置来解决试验方法A中的放气效应，并阻止试验方法A产生有效结果，则首选试验方法B。 1.2 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。 具体危险说明见第节 9 和 17 . 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 纤维密度可用于确定单纤维或纤维束的纤维强度和模量。这些特性基于有效面积上的荷载或模量斜率。纤维密度与试样的线性质量一起使用时，可以计算试样的近似总有效面积。 5.3 在复合材料应用中，当根据钢筋质量和层压板密度确定钢筋体积和空隙体积时，纤维密度用作组成属性。

1.1 These test methods cover two procedures for determination of the density of flax fiber and are applicable to fibers of any length. 1.1.1 Test Method A—Gas Pycnometry— This is the more accurate method of density measurement and is preferred in cases in which specimen conditioning (oven drying) can be applied or outgassing effects can be mitigated by purge settings. The level of accuracy for the test methods can be assessed from the precision and bias tables. Outgassing effects can be assessed by performing a purge cycle, pressurization, and pressure stability check on the sample. If the pressure increases in an isolated sample chamber, outgassing may affect the accuracy of results. Oven dry specimens below 55 ºC to equilibrium with a 0 % relative humidity (RH) environment or use longer purge methods, or both, to eliminate outgassing effects. 1.1.2 Test Method B—Buoyancy (Archimedes) Method— This is acceptable as an alternative to Test Method A in applications in which less accurate results are sufficient, as represented in the precision and bias tables. Test Method B is preferred in cases in which outgassing effects in Test Method A cannot be addressed by oven drying or purge settings and prevent Test Method A from producing valid results. 1.2 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 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. Specific hazard statements are given in Sections 9 and 17 . 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 can be used to determine fiber strength and modulus of a single fiber or bundle of fibers. These properties are based on load or modulus slope over an effective area. Fiber density, when used with the lineal mass of the specimen, can calculate an approximate, total effective area for the specimen. 5.3 In composite applications, fiber density is used as constituent property when determining reinforcement volume and void volume based on reinforcement mass and laminate density.