How to identify the quality of epoxy pipe from the appearance?

Epoxy pipe appearance: The appearance should be flat and smooth, free of bubbles, oil and impurities, and color unevenness, scratches, and slight height inequality that do not hinder the use are allowed. Epoxy pipes with a wall thickness of more than 3mm allow end faces or cross-sections to be unobstructed. Crack applied.

The manufacturing process of epoxy pipe can be divided into four types: wet rolling, dry rolling, extrusion and wire winding.