1.1 本规范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中使用的材料寿命的标准化程序。 1.2 该实践旨在将预期随时间保持性能特征的防火材料与预期随时间性能特征降低的防火材料区分开来。DSC实验曲线评估也可以提供不同的结果，其中如果没有使用常规耐久性测试的额外测试，就不可能解释样品性质。它评估在特定的温度和湿度条件下，防火材料内发生的化学反应程度。这种做法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 本规范旨在用于验证防火系统中使用的材料的预期寿命。该实践不打算用于衡量防火试验中人工老化材料的性能。由于测试样本的尺寸限制和测试本身的性质，本文描述的方法不能用作用于防火测试的材料的预处理。 1.4 本规范旨在评估贯穿式防火带中使用的以下类型的材料: 1.4.1 吸热的， 1.4.2 膨胀的， 1.4.3 绝缘， 1.4.4 消融剂，以及 1.4.5 升华。 1.5 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。部分给出了一些具体的危害 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 5.1 防火系统接受防火测试，并使用很可能是最近制造的材料进行分类。该测试为防火系统提供了以小时为单位的耐火等级。防火系统测试的目标是识别和列出防火系统，这些防火系统的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防火系统受到考验的建筑物火灾。到那时，防火系统由老化的材料组成。期望定量地确定防火系统将继续具有不低于墙壁或地板组件的耐火等级的一些保证。 5.2 本实践提供了一种方法，用于检查防火材料在其设计寿命期间的特性是否会发生任何变化，如通过材料内发生的任何化学反应来测量的。转化率的测量提供了材料在其设计寿命期间变化多少的标准测量。这提供了材料的主体是否可能表现出其在防火系统中被选择的所需性质的客观指示。 5.3 转化率的测量允许比较用于类似目的的不同防火材料在其设计寿命期间保持不变的能力。 5.3.1 这使得具有异常高转化率的材料在研发过程的早期就受到质疑并可能被拒绝。 5.3.2 这使得测试和上市机构能够对材料进行筛选，以确保它们不会为在整个预期设计寿命内不太可能具有足够性能的产品提供上市。5.3.3 这允许评估对防火测试结果没有明显影响的配方变化对性能的任何可能的长期影响。 5.3.4 转化率的重新计算（第节规定的标准时间和温度除外 11 )允许评估材料在可能经常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装置中的适用性，或两者兼而有之。 5.4 转换率的测量允许通过测量每种材料的转换率，将防火材料的寿命与安装了防火系统的分类墙壁或地板组件的寿命进行比较。这种比较可以确保防火系统不会显著更快地退化，因此可能认为它是不可接受的。该比较还可以确保防火系统不会不合理地保持比地板或墙壁本身更高的寿命标准。 5.5 利用DSC转化率数据评估防火材料寿命的固有基本假设是，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太大变化，则有理由期望其在安装多年后遭受实际火灾时充分执行其设计功能。

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 validate an expectation of longevity for materials that are used within a firestopping system. The practice is not intended to be used to gauge the performance of artificially aged materials in a firestop test. The method described herein cannot be applied as a preconditioning of a material meant for a firestop test due to the size limitation of the test specimen and the nature of the test itself. 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.