Our external & Internal Coating Pipe (PEP) for water line offers the following excellent features.

1. External/Polyethylene

A) Excellent chemical resistance

B) Excellent strength and impact resistance

C) Excellent electrical insulation resistance

D) Low water absorption

E) Wide range of service temperatures

F) Pinhole free homogeneous coating

G) Excellent adhesion

2. Internal/Luquid Epoxy

A) A wide range of service temperature

B) Excellent resistance to cathodic disbonding and excellent waterproofing

C) Excellent impact resistance and adhesion

D) Smooth and pleasing appearance

Wistco applies external coating by cross-head extrusion type for small diameter pipes(3~16inches) and side extrusion tpe for medium and large diameter pipes(8~66inches) and applied internal coating by Spraying liquid epoxy on the warmed pipes in order to quickly cure the epoxy.

1. Polythylene/External

A) The external surface is shot-blasted(SIS 05.59.00 SA 2 1/2) by removing millscale and rust, obaining metal surface which facilitates the adhesion.

B) The pipe is heated in electric or gas oven at a controlled temperature.

C) The adhesive is then applied by hot melt or copolymer. It binds the polyethclene th the steel.

D) Immediately afterwards, the extruded polyethylene is coated on the pipe.

E) After application of the polyethylene, the pipe is colled by spraying water.

2. Liquid Epoxy/Internal

A) The internal surface is shot-blasted(SIS 05.59.00 SA 2 1/2) by removing millscale and rust, obtaining metal surface.

B) The pipe is then coated with liquid epoxy by spraying systems.

C) When liquid epoxy is coated, the pipe is warmed, in order to quickly cure the epoxy.

Outside diameter : 3~66 inches (76.2~1,650 mm)

Wall thickness : 0.3~0.9 inches (7.1~22.8 mm)

Length : 20~40ft (6.0~12.0m)

External : Adhesive & P.E : 1.0~5.0 mm

Internal : Wpoxy 4~16 miles (100~400 microns)