ASTM F1973-21
聚乙烯(PE)、聚酰胺11(PA11)和聚酰胺12(PA12)燃氣分配系統中工廠組裝的無陽極豎管和過渡配件的標準規范
Standard Specification for Factory Assembled Anodeless Risers and Transition Fittings in Polyethylene (PE) and Polyamide 11 (PA11) and Polyamide 12 (PA12) Fuel Gas Distribution Systems