... ,PE-RT)& Steel2.PE(PE-X,PPR,PE-RT) STEEL PE pipe is made of five layers,both outer and inner layers are Plastic,Steel in ... the middle,and two layers glues. Out Diameter from 20mm to 200mm 3.This PE(PE-X,PPR,PE-RT)-STEEL-PE composite ... 253;OHSMS;R.I.SO9001 Certificates verify,PE(PE-X,PPR,PE-RT) STEEL PE pipe is in top quality. 5.The goods must be ...