ISO 13844:2022 塑料管道系统.与塑料管一起使用的弹性密封环型承插接头.负压、角度偏转和变形下密封性的试验方法
Plastics piping systems — Elastomeric-sealing-ring-type socket joints for use with plastic pipes — Test method for leaktightness under negative pressure, angular deflection and deformation