There are two typies of pipe lined: 1. Pipe tight lining. It is commonly known as pull tube, that is, tetrafluoro-pipe slightly larger than the steel tube inside diameter, through mechanical traction lining into the steel tube 2.Pipe loose lining. that is the outer diameter of the tetrafluoro pipe is slightly smaller than the inner diameter of the steel pipe, which is directly lined into the steel pipe through manual insertion. Main material: - PTFE (F4) is suitable for conveying strong corrosive medium ≤120℃, such as dilute HCl, HNO3,H2SO4,HF,NaOH, etc - PE service temperature ≤80℃, suitable for general weak corrosive medium transport, corrosion resistance is general - PP and PO service temperature ≤100℃, suitable for a small amount of solvent corrosive medium transport, corrosion resistance is generally