GOST R 57030-2016 玻璃纤维增强热固性塑料管和管道部分. 测定湿环境下长期极限弯曲应变和长期极限相对环偏转的试验方法
Fiberglass-reinforced thermosetting plastic pipes and parts of pipelines. Test method for determination of the long-term ultimate bending strain and the long-term ultimate relative ring deflection under wet conditions