How to Compare the Quality of PE Pipe

December 04, 2018

PE pipe performance depends on the quality of raw materials, processing equipment and processing technology control. There are many non-standard manufacturers in the market for the pursuit of profit, reduce costs, do not hesitate to add the recycled material to production, which directly affects the performance of the pipe. How to distinguish the quality of PE pipe? PE pipe manufacturers for you to introduce the following 7 methods.

Reborn material

So how do you compare the quality of PE water pipes?


High quality product: the inner and outer surfaces of pipes are smooth without bubbles, depressions, impurities and other defects.

Inferior products: the inner and outer surfaces of pipes are not smooth, non-bright, pitted and have obvious depressions on the inner and outer surfaces.

PE water pipes

2.Milling pipe strip

Qualified raw materials in the construction of products, welding machine cutting strip should be bright color, repeated folding is not easy to break. Milling strip color bleaching or other colors are the result of adding recycled materials or uneven mixed raw materials. High quality products: glossy, smooth, repeated folding is not easy to break.
Inferior products: dark color, folding easy to break.

The cutting strip

3.Welding surface

Qualified welding surface shall have smooth and symmetrical flanging along the entire circumference of the pipe, and the minimum depth of flanging shall not be lower than the surface of the pipe; The amount of any wrong side of the outer circumference adjacent to the flanging on both sides of the weld shall not exceed 10% of the wall thickness of the pipe; Welding beads should be solid, smooth and wide at the base. There should be no impurities, holes, distortion and damage on the bottom side of beads.
High quality products: smooth welding beads. After joint pressure, bead can be longer.

Inferior products: after welding, the beads surface produces a lot of air holes. Beads short after joint pressure.

The welding mouth


High quality products: Fresh processed or heated melted products have a slight plastic fragrance, no odor when cooled.
Inferior product: A pungent odor immediately after processing or when heated and melted.


High quality products: The flame base is light blue with no peculiar smell.
Inferior product: Unstable combustion, irregular melting drop, a small amount of black smoke and odor.

6.Elongation at break

Elongation at break refers to the ratio between the length value and the original length of the specimen at the time of breaking. The elongation at break is high, indicating that the better the product's flexibility, the better its performance.
Quality products: stretch to 3.5 times without breaking.
Inferior products: elongate easy fracture, poor toughness.

Elongation at break

7.Oxidation induction time

Oxidation induction time is the time when the autocatalytic oxidation reaction of the sample begins to occur under the condition of high temperature oxygen, and it is an index to evaluate the heat resistance and degradation ability of the material in molding, storage, welding and use. The longer the oxidation induction time, the better the product aging resistance, the better the performance.


JUNNUO introduces you the above 7 methods, hoping to help you to distinguish the quality of PE pipes.