标准摘要
[中文适用范围]： 本国际标准规定了通过扩散测定试样长期吸水率的设备和程序。 它适用于隔热产品。 它的设计目的是模拟产品对水的吸收，不仅要长时间承受两侧接近 100% 的高相对湿度，还要承受水蒸气压力梯度，如倒置屋顶或无保护的接地绝缘。 该测试并不适用于所有类型的隔热产品。 产品标准通常应说明该测试是否适用于特定产品。 [外文原描述]： ISO 20393:2007 specifies equipment and procedures for determining the long-term water absorption of test specimens by diffusion. It is intended for use with thermal-insulation products. It is designed to simulate the absorption of water by products subjected for a long period of time not only to high relative humidity, approximating to 100 %, on both sides but also to a water vapour pressure gradient, as experienced by e.g. inverted roof or unprotected ground insulation. The test is not applicable to all types of thermal-insulation product. The product standard should normally state whether this test is applicable to a particular product.
英文名称Thermal-insulating materials — Determination of long-term water absorption by diffusion