1.1 本规程涵盖了通过使用差示扫描量热法获得的数据，定量评估防火系统所用材料寿命的标准化程序。 1.2 本规程旨在区分预期随时间保持性能特性的防火材料和预期随时间性能特性降低的防火材料。DSC实验曲线评估也可以提供不同的结果，如果不使用传统耐久性测试进行额外测试，则无法解释样品特性。它评估了在特定温度和湿度条件下防火材料内发生的化学反应程度。本规程不测量单个防火系统可能经历的特定恶劣环境条件或建筑操作下的寿命。 1.3 本规程旨在用于测试阻火系统内使用的材料。本规程不用于测试组装阻火系统的性能。 1.4 本规程旨在评估贯穿件阻火器中使用的以下类型的材料: 1.4.1 吸热的 1.4.2 膨胀， 1.4.3 隔热 1.4.4 烧蚀剂，以及 1.4.5 升华。 1.5 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。 1.6 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。 第节给出了一些具体的危险 8. 关于危险。 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 防火系统暴露于火灾测试中，并使用最近制造的材料进行分类。该测试提供了防火系统的耐火等级，以小时为单位进行测量。防火系统测试的目标是确定并列出防火系统，其耐火等级不低于安装防火系统的分类墙壁或地板组件的耐火等级。 在建筑物寿命期间的任何时候都可能发生可能使阻火系统受到测试的建筑物火灾。到那时，防火系统由老化的材料组成。需要一些保证，以定量确定阻火系统的耐火等级将继续不低于墙壁或地板组件的耐火等级。 5.2 本规程提供了一种方法，用于检查防火材料的特性在其设计寿命内是否会发生任何变化，通过材料内部发生的任何化学反应来衡量。转换率的测量提供了材料在其设计寿命内变化程度的标准测量。这提供了一个客观指标，表明大部分材料是否可能表现出在防火系统中选择的理想特性。 5.3 通过测量转化率，可以比较用于类似目的的不同阻火材料在其设计寿命内保持不变的能力。 5.3.1 这使得具有异常高转化率的材料在研发过程中受到质疑，并可能在早期被拒绝。 5.3.2 这允许测试和上市机构对材料进行筛选，以确保它们不会为不可能在预期设计寿命的整个期限内具有足够性能的产品提供上市。 5.3.3 这允许评估对耐火试验结果没有明显影响的配方变化对性能的任何可能的长期后果。 5.3.4 重新计算转换率（第节规定的标准时间和温度除外 11 )允许评估材料在可能定期暴露于异常高温的应用中的适用性，或在预期具有异常长设计寿命的安装中的适用性，或两者兼而有之。 5.4 通过测量防火材料的转换率，可以将防火材料的寿命与安装防火系统的分类墙或地板组件的寿命进行比较。这种比较可以确保firestop系统不会明显更快地退化，因此可能认为它是不可接受的。这种比较还可以确保防火系统的使用寿命不会超过地板或墙壁本身。 5.5 使用DSC转换率数据评估阻火材料寿命的基本假设是，如果材料具有化学稳定性，使其在特定环境中不会随时间发生很大变化，那么在安装多年后遭受实际火灾时，可以合理预期其充分发挥其设计功能。

1.1 This practice covers a standardized procedure for quantitatively assessing the longevity of materials used in firestop systems, by the use of data obtained from differential scanning calorimetry. 1.2 This practice is intended to differentiate firestop materials that are expected to maintain performance characteristics over time from those that are expected to degrade in performance characteristics over time. DSC experimental curve evaluation can also deliver indifferent results, where an interpretation of sample properties is not possible without additional testing using conventional durability testing. It evaluates the extent of chemical reactions that will occur within the firestop material under specified conditions of temperature and humidity. This practice does not measure longevity under specific severe environmental conditions or building operation that might be experienced by an individual firestop system. 1.3 This practice is intended to be used to test the materials used within a firestopping system. The practice is not intended to be used to test the properties of assembled firestopping systems. 1.4 This practice is intended to evaluate the following types of materials used in through-penetration fire stops: 1.4.1 Endothermic, 1.4.2 Intumescent, 1.4.3 Insulation, 1.4.4 Ablatives, and 1.4.5 Subliming. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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. Some specific hazards are given in Section 8 on Hazards. 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 Firestop systems are exposed to fire tests and classified using materials that have been, in all likelihood, quite recently manufactured. The testing provides a fire resistance rating for the firestop system that is measured in hours. The goal of firestop system testing is to identify and list firestop systems that will have a fire resistance rating that is no less than the fire resistance rating of the classified wall or floor assembly in which it is installed. A building fire that could put the firestop system to the test can occur at any time during the life of the building. By that time, the firestop system is composed of materials that have aged. Some assurance is desired to establish quantitatively that the firestop system will continue to have a fire resistance rating that is no less than that of the wall or floor assembly. 5.2 This practice provides one method for examining whether any changes are to be expected in the characteristics of a firestop material during its design life, as gauged by any chemical reactions that occur within the material to change it. The measurement of conversion rate provides a standard measure of how much a material will change over its design life. This provides an objective indication of whether the bulk of the material is likely to exhibit the desirable properties for which it was chosen in the firestop system. 5.3 Measurement of conversion rate allows different firestop materials used for similar purposes to be compared with respect to their ability to remain unchanged during their design life. 5.3.1 This allows materials with an unusually high conversion rate to be questioned and possibly rejected early on during the research and development process. 5.3.2 This allows materials to be screened by testing and listing agencies to ensure that they do not provide a listing for products that are not likely to have adequate performance for the full length of the intended design life. 5.3.3 This allows formulation changes that have no apparent impact on the results of the fire testing to be evaluated for any possible long-term consequences on performance. 5.3.4 Re-calculation of the conversion rate (other than for the standard time and temperature specified in Section 11 ) allows materials to be evaluated for suitability in applications where they may be regularly exposed to unusually high temperatures, or for suitability in installations which are intended to have an unusually long design life, or both. 5.4 Measurement of conversion rate allows longevity of firestop materials to be compared to the longevity of the classified wall or floor assemblies in which the firestop system is installed, by measuring the conversion rate for each. This comparison can ensure that the firestop system does not degrade significantly faster, thus possibly deeming it to be unacceptable. The comparison can also ensure that the firestop system is not unjustifiably held to a higher standard of longevity than the floor or wall itself. 5.5 The fundamental assumption inherent in making use of DSC conversion rate data for assessing longevity of firestop materials is that if the material has a chemical stability that keeps it from changing much over time in a certain environment, then it is reasonable to expect it to adequately perform its design function if subjected to an actual fire many years after installation.