1.1 本规程涵盖了试验方法适用的样品制备温度、试验参数和样品暴露条件 D5405/D5405M 用于对由三元乙丙橡胶（EPDM）屋顶膜材料制成的粘接接头进行失效时间（蠕变断裂）测试。 1.2 本规程适用于实验室内由供应商提供的三元乙丙橡胶屋顶膜材料和粘合剂制成的接头，以及从现场安装中取样的三元乙丙橡胶接缝制成的接头。 1.3 使用预制胶带或液体粘合接头- 基于粘合剂和三元乙丙橡胶屋顶膜材料，这些材料为非增强型、织物或纤维增强型和织物背衬型。对于特定的粘合剂，也推荐使用底漆。 1.4 本规程包含解释性注释，不属于本规程强制性要求的一部分。 1.5 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.6 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。 1.7 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 影响三元乙丙橡胶膜接缝性能的一个重要因素是其在膜预期使用寿命内保持粘合的能力。失效时间测试提供了一种表征接头在恒定载荷下随时间变化的行为的方法。 注1: 表1 基于一个行业政府财团对三元乙丙橡胶粘接接头的蠕变断裂阻力（失效时间）的研究结果。 4. , 5. 参考脚注4和5提供了在以下条件下开发的典型故障时间数据: 表1 ，用于实验室使用非增强型三元乙丙橡胶屋顶膜材料、丁基胶带和液体粘合剂制造的三元乙丙橡胶接头。注意，本规程中规定的剥离载荷为9.8 N[2.2 lbf]。进行脚注4和5中所述试验的剥离载荷为9.3 N[2.1 lbf]。9.8 N[2.2 lbf]的荷载对应于1 kgf[2.2 lbf]，质量为1-kg[2.2 lbm]的自重可通过实验室设备供应室获得。类似地，29.4 N[6.6 lbf]的载荷对应于3-kg[6.6 lbm]质量的自重。 5.2 失效时间试验补充了其他机械试验，如表征三元乙丙橡胶屋顶膜接缝的强度，并可纳入连接三元乙丙橡胶屋顶膜材料的粘合剂规范中。 5.3 本规程针对三元乙丙橡胶接头，是对试验方法的补充 D5405/D5405M 这为任何非沥青有机屋顶膜材料制成的接缝的制备和蠕变断裂测试提供了一般要求。 5.4 进行接头EPDM屋顶膜失效时间试验的实验室经验表明，试样蠕变较小- 在剥离载荷下比在剪切载荷下更具抵抗力。因此，本规程中规定的大多数试验是在剥离载荷下进行的。 5.5 本规程未制定EPDM胶缝在使用中可能遇到的所有环境条件的故障时间数据。

1.1 This practice covers sample preparation temperatures, test parameters, and specimen exposure conditions that are applicable when Test Method D5405/D5405M is used for conducting time-to-failure (creep-rupture) tests of adhesive joints fabricated from ethylene-propylene-diene terpolymer (EPDM) roof membrane material. 1.2 This practice is applicable to joints fabricated in the laboratory from EPDM roof membrane materials and adhesives received from suppliers, and to joints prepared from EPDM seams sampled from field installations. 1.3 The joints are bonded using preformed tape or liquid-based adhesives, and EPDM roof membrane materials that are non-reinforced, fabric- or scrim-reinforced, and fabric backed. Primers are also used as recommended for the specific adhesive. 1.4 This practice contains notes that are explanatory and are not part of the mandatory requirements of this practice. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.6 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. 1.7 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 An important factor affecting the performance of seams of EPDM membranes is their ability to remain bonded over the membrane's expected service life. Time-to-failure tests provide a means of characterizing the behavior of joints under constant load over time. Note 1: Table 1 is based on the results of an industry government consortium study on creep-rupture resistance (time-to-failure) of EPDM adhesive joints. 4 , 5 Referral to Footnotes 4 and 5 provides typical time-to-failure data, developed under the conditions in Table 1 , for EPDM joints fabricated in the laboratory with non-reinforced EPDM roof membrane material, butyl-based tapes, and liquid adhesives. It is noted that the peel load specified in this practice is 9.8 N [2.2 lbf]. The peel load under which the tests described in Footnotes 4 and 5 were conducted was 9.3 N [2.1 lbf]. A load of 9.8 N [2.2 lbf] corresponds to 1 kgf [2.2 lbf], and dead weights of 1-kg [2.2-lbm] mass are available through laboratory equipment supply houses. Similarly, a load of 29.4 N [6.6 lbf] corresponds to a dead weight of 3-kg [6.6-lbm] mass. 5.2 Time-to-failure tests complement other mechanical tests such as strength for characterizing joints of EPDM roof membranes, and can be incorporated in specifications for adhesives for joining EPDM roof membrane material. 5.3 This practice, which is specific to EPDM joints, complements Test Method D5405/D5405M that provides general requirements for the preparation and creep-rupture testing of joints fabricated from any nonbituminous organic roof membrane material. 5.4 Laboratory experience in conducting time-to-failure tests of joints EPDM roof membranes has shown that specimens are less creep-resistant under peel loading than under shear loading. Consequently, the majority of the tests stipulated in this practice are performed under peel loading. 5.5 This practice does not develop time-to-failure data on all environmental conditions to which EPDM adhesive seams can be subjected in service.