标准摘要
[中文适用范围]： 本国际标准规定了两种在活性炭存在下在规定的时间和温度条件下定量测定塑料质量损失的经验方法。 该方法特别适用于定量测定加热时增塑塑料中的增塑剂释放量，通常假设不存在显着量的其他挥发物。 这些测试方法是经验性的，仅适用于相对快速地比较不同塑料中增塑剂或挥发性化合物的释放情况。 它们还可用于比较不同类型的增塑剂；在这种情况下，标准模塑料应由具有已知树脂与增塑剂比例的特定树脂制成。 注：这些比较仅适用于相同厚度的样品。 如果可以假设经过试验处理的试样在修复后的含水量与原始处理后的含水量相同，则可以忽略水分的影响。 指定了两种方法： ——方法 A：样品与碳直接接触；该方法特别适用于必须在相对较低温度下进行测试的材料，因为它们在较高温度下会发生塑性变形； ——方法 B：将样品放置在金属丝篮中，防止样品与活性炭直接接触。 [外文原描述]： ISO 176:2005 specifies two empirical methods for the quantitative determination of the loss of mass from a plastic material under defined conditions of rime and temperature, in the presence of activated carbon. Method A -- The test specimens are in direct contact with the carbon; this method is particularly useful for materials that have to be tested at relatively low temperatures because they flow at higher temperatures. Method B -- The test specimens are placed in wire cages that prevent direct contact between the test specimens and the carbon. These methods apply, in particular, to the quantitative determination of the loss on heating of plasticizers from plasticized plastic materials, in which case it is generally assumed that no significant amounts of other volatile materials are present. They are empirical test methods, suitable only for a rather rapid comparison of the losses of plasticizers or, in general, of volatile compounds, from different plastics. ISO 176:2005 also applies to the comparison of different types of plasticizers; in this case standard compounds should be prepared, on the basis of a well characterized resin, with known ratios of resin to plasticizer.
英文名称Plastics — Determination of loss of plasticizers — Activated carbon method