本文件规定了标称尺寸DN？100及以上的玻璃纤维增强热固性塑料（GRP）管道和配件在偏转条件下的耐化学性测定方法。 结合ISO？10928，本文件提供了一种方法，用于评估化学环境在指定时间段后对管道或管件内部的影响。相关国际标准中规定了试验条件和要求。ISO？23856引用了本文件。 注？已经发现，偏转引起的应变可加速化学环境的影响；因此，这种效应通常被称为应变腐蚀。

This document specifies a method for determining the chemical resistance properties of glass-reinforced thermosetting plastics (GRP) pipes and fittings in a deflected condition for nominal sizes DN？100 and larger. In conjunction with ISO？10928, this document provides a method for evaluating the effect of a chemical environment on the interior of a pipe or fitting after a specified period of time. Test conditions and requirements are specified in the referring International Standard. ISO？23856 references this document. NOTE？It has been found that the effect of chemical environments can be accelerated by strain induced from deflection; hence, this type of effect is frequently referred to as strain corrosion.