Prefabricated directly-buried polyurethane foam plastic insulation pipes More information please contact us ... ,ASTM-A106,ASTM-A53,SY5037-2000,GB/T5711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345,10#, ... A 106-2006 / ASTM A 53-2007DIN : DIN EN 10216-1-2004 / DIN 1630API : API 5CT / API 5L / API5DPGB ... service and worldwide business . Prefabricated directly-buried polyurethane foam plastic insulation pipes