7 ways to teach you how to distinguish PE pipe is good or bad

There are many non-standard manufacturers in the market to pursue profits and reduce costs. At the expense of adding many non-standard manufacturers in the recycling materials market, in order to pursue profits and reduce costs, they will not hesitate to add recycled materials, which directly affects the pipe. Performance production, which directly affects the performance of PE pipes.

1, the appearance

High-quality products: the inner and outer surfaces of the pipe are smooth and smooth without bubbles, depressions, impurities and other defects.Inferior products: The inner and outer surfaces of the pipe are not smooth, not bright, have pitting, and the inner and outer surfaces are obviously sunken.

2, milling strips

When the products produced by qualified raw materials are used during construction, the strips cut by the welder should be bright in color and repeatedly folded and not easily broken. Milling strips are white in color or appear in other colors due to the addition of recycled materials or uneven mixing of raw materials.High-quality products: oily, flat, repeated folding is not easy to break.Inferior products: the color is dark and the fold is easy to break.

3, the welding mouth

A qualified welded joint shall have a smooth and symmetrical flange along the entire circumference of the pipe, and the minimum depth of the flange shall not be lower than the surface of the pipe; the amount of any misalignment on both sides of the weld adjacent to the outer circumference of the flange shall not exceed the pipe wall. 10% thick; the cuffs should be solid and smooth with a wide root. There should be no impurities, holes, distortion and damage on the underside of the flange.High-quality products: the flanging is smooth and flat, and the flange can be longer after the joint pressure.Inferior products: a large number of pores are formed on the surface after the flanging. After the seam pressure, the flange is short.

4, the sense of smell

High-quality products: Products that have just been processed or heated and melted have a slight plastic scent, and the cooled product has no odor.Inferior products: pungent smell.

5, burning flame

High-quality products: The combustion droplets are stable, the base of the flame is light blue, and there is no smell.Inferior products: unstable combustion, irregular droplets, a small amount of black smoke and odor.

6. Elongation at break

Elongation at break refers to the ratio of the length of the sample to the original length at the time of breaking, and the elongation at break is about high, indicating that the product is more flexible and the better the performance.Quality product: stretched to 3.5 times without breaking.Inferior products: easy to break and poor toughness.

7, oxidation induction time

The oxidation induction time is a time for determining the start of the autocatalytic oxidation reaction of the sample under high temperature oxygen conditions, and is an index for evaluating the heat-resistant degradation ability of the material during molding, storage, welding and use. The longer the oxidation induction time, the better the aging resistance of the product and the better the performance.

Created on:2019-05-27 11:05