1.1 本试验方法涵盖了在动态气流条件下确定通常用于安全气囊的可渗透无涂层织物的高压渗透性的程序。对于在稳定气流下低压条件下测定安全气囊织物的透气性，请参阅试验方法 D737 . 1.2 经买方和供应商同意，可使用本试验方法中规定以外的程序和仪器，具体偏离报告中确认的标准。 1.3 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。 1.4 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====== 5.1 有关商业装运批次验收和符合规范或其他标准的事项，请参阅第节 13 本试验方法。 5.2 本试验方法有助于安全气囊垫中使用的可渗透、不可涂层织物的选择和设计验证。与试验方法的稳态条件相比，该试验方法的动态条件和更高的压差可以更好地模拟气囊模块在展开过程中的充气和放气循环 D737 . 5.2.1 只能使用未涂层、可渗透的织物。使用涂层织物可能会产生无效结果，并可能损坏测试仪器。 5.3 在第节中表示的方差范围内 12 ，该测试方法对设计验证有用，并且可能适用于纳入材料规范或商业装运的批量验收测试。建议在极低渗透性织物或200厘米厚的织物上小心 3. 根据第节中所述的实验室精度，确定测试头的尺寸 12 可能高达21 %. 5.4 本试验方法可用于除充气约束织物以外的材料，这些材料在突然爆发时会经历动态透气性。在这种情况下，物理装置或其软件算法可能需要修改以提供适用性。 5.5 由于测试的时间间隔为分秒，压力与时间数据会受到记录异常和电子噪声的影响。在进行数据分析之前，应对数据进行数字过滤，以获得潜在的平滑压力曲线。仪器中的软件包括一个可靠的算法，用于平滑曲线和确定透气性指数。 5.6 在该设备的设计和操作中，对校准和测量至关重要的主要部件特定于单个测试头。测试头的尺寸或渗透性测量范围通常与待测试的织物样本相对应。该测试方法的精度在很大程度上取决于测试头的尺寸。使用一个测试头收集的数据的精度应用于估计使用不同测试头收集的数据的精度，即使是在同一设备上。 5.7 测试纺织品时，必须在标准大气中对织物试样进行调节和测试。

1.1 This test method covers the procedures used to determine under dynamic airflow conditions the high pressure permeability of permeable, uncoated fabrics typically used for inflatable restraints. For the determination of air permeability of inflatable restraint fabrics under low pressure conditions at steady-state air flow, refer to Test Method D737 . 1.2 Procedures and apparatus other than those stated in this test method may be used by agreement of purchaser and supplier with the specific deviations from the standard acknowledged in the report. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 ====== 5.1 For matters relating to lot acceptance of commercial shipments and conformity to specification or other standard, refer to Section 13 of this test method. 5.2 This test method is useful in the selection and design validation of permeable, uncoatable fabrics used in inflatable restraint cushions. The dynamic conditions and higher pressure differentials of this test method may better simulate the inflation and deflation cycle of an airbag module during deployment than do the steady-state conditions of Test Method D737 . 5.2.1 Only uncoated, permeable fabrics should be used. Use of coated fabrics may yield invalid results and potentially damage the test apparatus. 5.3 Within the limits of variance expressed in Section 12 , this test method is useful for design validation and may be suitable for incorporation in a material specification or for lot acceptance testing of commercial shipments. Caution is advised on very low permeability fabrics or with the 200 cm 3 size test head because between-laboratory precision as presented in Section 12 may be as high as 21 %. 5.4 This test method may be used for materials other than inflatable restraint fabrics which experience dynamic air permeability in sudden bursts. In such cases, the physical apparatus or its software algorithms may require modification to provide suitability for use. 5.5 Due to the split-second time interval for testing, the pressure versus time data is subject to recording anomalies and electronic noise. The data should be digitally filtered to obtain the underlying smooth pressure curve prior to data analysis. The software in the apparatus includes a reliable algorithm both to smooth the curve and to determine the exponent of air permeability. 5.6 It is inherent in the design and operation of this equipment that major components key to the calibration and measurements are specific to the individual test head. The size or permeability measuring range of the test head is typically chosen to correspond to the fabric specimen to be tested. The precision of this test method is highly dependent on the size of the test head. The precision of the data collected using one test head should be used to estimate the precision of data collected using a different test head, even on the same apparatus. 5.7 It is mandatory that fabric specimens be conditioned and tested in standard atmosphere for testing textiles.