塑料.微生物作用的评价

[中文适用范围]： 本文件规定了确定塑料因真菌、细菌和土壤微生物作用而变质的方法。其目的不是确定塑料的生物降解性或天然纤维复合材料的变质。变质的类型和程度可以通过 a) 目视检查和/或 b) 质量变化和/或 c) 其他物理性质变化来确定。这些测试适用于所有表面平整且易于清洁的塑料。多孔材料除外，例如塑料泡沫。本文件使用与 IEC 60068-2-10 相同的测试真菌。IEC 方法使用所谓的“组装样本”，要求用孢子悬浮液接种样本，培养接种的样本并评估真菌生长以及对样本的任何物理攻击。测试量和使用的测试菌株取决于塑料的预期应用。 [外文原描述]： This document specifies methods for determining the deterioration of plastics due to the action of fungi and bacteria and soil microorganisms. The aim is not to determine the biodegradability of plastics or the deterioration of natural fibre composites. The type and extent of deterioration can be determined by a) visual examination and/or b) changes in mass and/or c) changes in other physical properties. The tests are applicable to all plastics that have an even surface and that can thus be easily cleaned. The exceptions are porous materials, such as plastic foams. This document uses the same test fungi as IEC 60068-2-10. The IEC method, which uses so-called "assembled specimens", calls for inoculation of the specimens with a spore suspension, incubation of the inoculated specimens and assessment of the fungal growth as well as any physical attack on the specimens. The volume of testing and the test strains used depend on the application envisaged for the plastic.