本文件规定了聚乙烯薄膜（通常称为聚乙烯套管）的特性，聚乙烯薄膜用作球墨铸铁管道的额外防腐保护，尤其是在侵蚀性土壤条件下铺设时。 这种薄膜的效率已被经验证明，它的形式是在管道铺设之前，在管道和配件周围现场安装一个薄板或管子。

This document specifies the characteristics of polyethylene film, commonly called polyethylene sleeving, used as additional protection against corrosion for ductile iron pipelines, particularly when laid in aggressive soil conditions. This film, the efficiency of which has been proved by experience, takes the form of a sheet or tube fitted around the pipes and fittings, on-site, immediately before pipe-laying.