ISO 11561:1999 热绝缘材料的老化-密封泡沫塑料耐热性长期变化的测定-加速实验室测试法.

标准编号：ISO 11561:1999

中文名称：热绝缘材料的老化-密封泡沫塑料耐热性长期变化的测定-加速实验室测试法.

英文名称：Ageing of thermal insulation materials — Determination of the long-term change in thermal resistance of closed-cell plastics (accelerated laboratory test methods)

发布日期：1999-07

标准范围

本国际标准规定了两种基于切片和缩放技术的实验室试验方法，以测定闭孔（通常为90%）多孔塑料材料热阻的长期变化所含气体通过扩散过程随时间影响泡沫的性能。使用测量热阻的标准方法，方法A包括定期测量在受控环境温度下，在短时间间隔内对薄试样进行处理环境随时间相对变化的结果与数学技术结合使用，以导出更大厚度材料的热阻随时间的变化。方法B描述了确定保守设计寿命的简单试验-时间价值（25年及以上）未抛光、闭孔、多孔塑料制品。该方法目前仅限于未经修饰的均质材料。在这种方法中，多个样品的核心和表面的材料与变化的斜率的主要一个样品内的阶段热阻率和小于10%的时间关系被视为同种类的通常，天然皮肤或密度偏差的产品通常与此类产品一起使用可被认为可通过该技术进行测试。

This International Standard specifies two laboratory test methods, based on slicing and scaling techniques, todetermine the long-term changes in the thermal resistance of closed-cell (normally 90 %) cellular plastic materialsthat contain gases which, through diffusion processes, affect the properties of a foam with time.Using standard methods for the measurement of thermal resistance, method A consists of periodic measurementsperformed over a short time interval on thin specimens conditioned in a controlled ambient temperatureenvironment. The results of relative change with time are used in conjunction with a mathematical technique toderive the thermal resistance of greater thicknesses of the material as a function of time.Method B describes a simple test to determine a conservative design life-time value (25 years and longer) for anunfaced, closed-cell, cellular plastic product. This method is limited currently to unfaced homogeneous materials.For this method, multiple specimens of the core and surfaces of materials with variations in the slope of the primarystage thermal resistivity and a time relationship of less than 10 % within a sample are considered to behomogeneous. Generally, products with natural skins or with density deviations normally found with such productsmay be considered acceptable for test by this technique.

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