1.1 该试验方法确定了在等温条件下，将刚性块和板隔热材料部分浸入液态水中规定时间间隔后，建筑施工应用中使用的刚性块和纸板隔热材料所保留的水量（包括地表水）。本试验方法旨在用于实验室中材料的表征。它不是为了模拟建筑施工应用中可能遇到的任何特定环境条件。 1.2 该试验方法并没有解决刚性隔热的所有可能的取水和蓄水机制以及相关现象。它只与中概述的条件有关 1.1 .由于完全浸没、水蒸气传输、内部冷凝、冻融循环或这些影响的组合而导致的隔热材料中的水分积聚的测定需要不同的测试程序。 1.3 每个部分浸泡间隔之后都有一个短暂的自由排水期。本试验方法不涉及或试图量化材料的排水特性。因此，对于具有不同内部结构和孔隙率的材料，如蜂窝材料和纤维材料，其结果不一定具有直接可比性。此外，由于孔隙率效应，不同厚度试样的试验结果不一定具有直接可比性。 材料的表面特性也会影响排水。表面粗糙的试样可能比表面光滑的试样保留更多的地表水，并且试样制备过程中的表面处理会影响水的吸收和保留。因此，不建议直接比较具有不同表面特性的材料的结果。 1.4 对于大多数材料，与现场实际安装的产品尺寸相比，试样尺寸较小。如果试样和相应产品的表面体积比不同，则试验结果可能会产生误导。 1.5 以国际单位制表示的数值应视为标准。 括号中给出的值是英寸磅单位的数学转换，仅供参考，不被视为标准。 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）。本标准的使用者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====== 4.1 厚度小于或等于15 mm（0.59 in.）的材料不得按照本试验方法进行试验，以避免试样完全浸入。这种类型的暴露超出了本试验方法的范围。 4.2 该试验方法用于评估短期保水性和长期保水性。短期保水性评估为0.75小时和3.00小时的部分浸泡间隔后的平均保水性，单位为千克/平方米（体积百分比）（对于厚度为25.4毫米（1.00英寸）的材料进行测试）。长期蓄水量评估为168- h部分浸入间隔，单位为千克/平方米（体积百分比）（对于厚度为25.4毫米（1.00英寸）的材料进行测试）。 4.3 材料应在实际产品厚度和25.4 mm（1.00 in.）厚度下进行测试，前提是材料可以切割到25.4 mm（1.00in.）的厚度，而不会改变材料的原始特性。如果在不改变材料原始特性的情况下无法切割产品，则应在测试报告中提供相应的信息。对于在实际产品厚度下测试的材料，应基于相等的标称润湿试样表面积（单位为千克/平方米）报告结果，对于在25℃下测试的物质，应基于相同的试样体积（单位为体积百分比）报告结果。 4毫米（1.00英寸）厚。如果产品不能切割到25.4 mm（1.00 in.）的厚度，或者如果实际产品厚度小于25.4 mm（1.00in.）但大于15 mm（0.59in.），则只能在实际产品厚度下对产品进行测试，并且只能在相等的标称润湿试样表面积的基础上报告结果。 4.3.1 通过在相同标称润湿试样表面积的基础上报告结果，可以公平地比较不同厚度的试样。对于某些试样，进水口和蓄水量主要取决于可用于进水口的标称润湿表面积。 4.3.2 通过在相等样本体积的基础上报告结果，可以使用通常选择的单位（体积百分比）来公平地比较样本。 对于某些材料，进水量和滞留量主要取决于可用于进水的试样的体积。 4.3.3 在大多数情况下，保水性是一种次要性能特征，对主要性能特征有影响，如热性能、表面水分积聚（可能导致真菌生长）或局部电解质收集（可能导致腐蚀）。根据感兴趣的主要性能特征，用于比较不同材料的保水性的优选单位为千克/平方米或体积百分比。 4.4 除本试验方法要求的浸泡时间外，还应允许选择浸泡时间，前提是所有相关方达成一致。 4.5 材料的保水特性可能会受到高温或化学暴露等条件的影响。

1.1 This test method determines the amount of water retained (including surface water) by rigid block and board thermal insulations used in building construction applications after these materials have been partially immersed in liquid water for prescribed time intervals under isothermal conditions. This test method is intended to be used for the characterization of materials in the laboratory. It is not intended to simulate any particular environmental condition potentially encountered in building construction applications. 1.2 This test method does not address all the possible mechanisms of water intake and retention and related phenomena for rigid thermal insulations. It relates only to those conditions outlined in 1.1 . Determination of moisture accumulation in thermal insulations due to complete immersion, water vapor transmission, internal condensation, freeze-thaw cycling, or a combination of these effects requires different test procedures. 1.3 Each partial immersion interval is followed by a brief free-drainage period. This test method does not address or attempt to quantify the drainage characteristics of materials. Therefore, results for materials with different internal structure and porosity, such as cellular materials and fibrous materials, are not necessarily directly comparable. Also, test results for specimens of different thickness are not necessarily directly comparable because of porosity effects. The surface characteristics of a material also affect drainage. It is possible that specimens with rough surfaces will retain more surface water than specimens with smooth surfaces, and that surface treatment during specimen preparation will affect water intake and retention. Therefore, it is not advisable to directly compare results for materials with different surface characteristics. 1.4 For most materials the size of the test specimens is small compared with the size of the products actually installed in the field. If the surface-to-volume ratios for the test specimens and the corresponding products are different, it is possible that the test results will be misleading. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered 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 ====== 4.1 Materials less than or equal to 15 mm (0.59 in.) in thickness shall not be tested in accordance with this test method in order to avoid complete immersion of the specimens. This type of exposure is beyond the scope of this test method. 4.2 This test method is used to assess both the short-term water retention and the long-term water retention. The short-term water retention is assessed as the average of the water retained following partial immersion intervals of 0.75-h and 3.00-h, in kilograms per square meter (percent by volume) (for materials tested at 25.4 mm (1.00 in.) thickness). The long-term water retention is assessed as the water retained following a 168-h partial immersion interval, in kilograms per square meter (percent by volume) (for materials tested at 25.4 mm (1.00 in.) thickness). 4.3 Materials shall be tested at both actual product thickness and 25.4 mm (1.00 in.) thickness provided the materials can be cut to a thickness of 25.4 mm (1.00 in.) without changing the original character of the materials. If a product cannot be cut without changing the original character of the material, the corresponding information shall be provided in the test report. Results shall be reported on the basis of equal nominal wetted specimen surface area (in units of kilograms per square meter) for materials tested at actual product thickness and on the basis of equal specimen volume (in units of percent by volume) for materials tested at 25.4 mm (1.00 in.) thickness. If a product cannot be cut to a thickness of 25.4 mm (1.00 in.) or if the actual product thickness is less than 25.4 mm (1.00 in.) but greater than 15 mm (0.59 in.), the product shall only be tested at actual product thickness and results only reported on the basis of equal nominal wetted specimen surface area. 4.3.1 By reporting results on the basis of equal nominal wetted specimen surface area, specimens of different thicknesses can be compared equitably. For some specimens, the water intake and retention primarily depends on the nominal wetted surface area available for water intake. 4.3.2 By reporting results on the basis of equal specimen volume, specimens can be compared equitably using units that commonly are selected to represent results of water intake testing (percent by volume). For some materials, water intake and retention primarily depends on the volume of the specimen available for water intake. 4.3.3 In most cases water retention is a secondary performance characteristic that has an influence on a primary performance characteristic, such as thermal performance, surface accumulation of moisture (that will potentially contribute to fungal growth), or localized collection of electrolytes (that will potentially contribute to corrosion). Depending on the primary performance characteristic that is of interest, the preferred units for use in comparing the water retention of different materials will be either kilograms per square meter or percent by volume. 4.4 Immersion times in addition to those required by this test method shall be permitted to be selected provided that all parties involved are in agreement. 4.5 The water retention characteristics of materials will potentially be affected by conditions such as elevated temperatures or chemical exposures.