DIN EN ISO 13259:2018-09 地下非壓力應(yīng)用熱塑性管道系統(tǒng) 彈性密封環(huán)型接頭密封性試驗(yàn)方法(ISO 13259:2018)
Thermoplastics piping systems for underground non-pressure applications - Test method for leaktightness of elastomeric sealing ring type joints (ISO 13259:2018)