... thickness1.8mm-30mmstandardAPI5L,API5CT,ASTM-A106,ASTM-A53,SY5037-2000,GB/T5711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345,10 ... and impermeable layer .The outer protection is of polythene or glass steel or other material .The pipe can be laid by ... n favorable reputation from customers. BS1387 ASTM A53 EN 39 GB/T 3091 insulation steel pipe