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Presentation at ASTM C16 Symposium on Next-Generation Thermal Insulation Challenges and Opportunities

机译：在ASTM C16研讨会上的演讲，涉及下一代隔热的挑战和机遇

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Vapor retarder materials of extremely low permeance are specified and used in many insulation applications. For mechanical systems operating at below ambient conditions, such materials are required to minimize intrusion of water vapor into the insulation; the lower the operating temperature, the more critical the vapor retarder function becomes. Some of these materials exhibit water vapor permeance of under 0.01 perm, and some are literally impermeable. The question of how reliable test method E96 is for testing such materials is often asked. In 2010, the task group under Committee C16 for thermal insulation that is responsible for E96, "Standard Test Methods for Water Vapor Transmission of Materials," undertook an Inter-laboratory Study (ILS), or "round robin," in which four materials of extremely low permeance were tested. The objective of this ILS was to develop a precision and bias (P&B) statement to characterize the robustness of the test for evaluating such materials, and to see what problems the labs experienced in the course of testing at this low level of water vapor transmission. The data obtained by the six participating labs and the statistical analysis of it would suggest that good precision can be obtained and it can serve the need for testing at these low levels. If performed with careful sample preparation, good control of conditions and close attention paid to data generated during the test, reliable results can be obtained. However, erroneously high results are not uncommon, and a critical take-away is the need for recognition of those outliers and the cause of them. As a related matter, within ASTM and the insulation industry there has been discussion of what defines, and how to classify, so-called "zero perm" vapor barriers. An overview of this topic is presented herein.
机译：规定了透气性极低的阻气材料，并已用于许多绝缘应用中。对于在低于环境温度的条件下运行的机械系统，要求使用这种材料以最大程度地减少水蒸气进入绝缘层的情况。工作温度越低，阻气剂的功能就越关键。这些材料中的一些表现出的水蒸气渗透性低于0.01烫发，而某些实际上是不渗透的。人们经常问这样的问题：测试方法E96对这种材料的可靠性如何。 2010年，负责E96的C16隔热委员会下的任务组“材料的水蒸气传输的标准测试方法”进行了实验室间研究（ILS）或“循环法”，其中四种材料极低的渗透性进行了测试。该ILS的目的是开发一种精确度和偏差（P＆B）语句，以表征评估此类材料的测试的鲁棒性，并了解实验室在这种低水平的水蒸气透过率下进行测试的过程中遇到了哪些问题。六个参与实验室获得的数据及其统计分析表明，可以获得很好的精度，并且可以满足在这些低水平下进行测试的需求。如果进行仔细的样品准备，良好的条件控制以及密切关注测试过程中生成的数据，则可以获得可靠的结果。但是，错误的高结果并不少见，关键是要认识到这些异常点及其原因。与此相关的是，在ASTM和绝缘行业内，已经讨论了定义和分类方法，即所谓的“零渗透”防潮层。本文介绍了此主题。

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