Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe

Figure 4

SEM images of the tensile fracture surface of W-PE60 (a, b) near to crack initiation point and W-PE60 after etching with potassium permanganate based etchant (c, d). Scale bar is 1 mm (a), 100 μm (b), and 500 μm (c, d).

(a)

(b)

(c)

(d)