China 'GB/T 37263-2018
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 37263-2018
Prefabricated directly buried insulating plastic-steel-plastic composite pipes with polyurethane [PUR]foamed-plastics and high density polyethylene [PE]casing pipes 高密度聚乙烯外护管聚氨酯发泡预制直埋保温钢塑复合管
Issued Date:2018
Implemented Date:2019-11-1
Issued by:
The Standardization Administration of the People's Republic of China