1. Observe whether the lumen is regular or not. Good quality PU tube lumen and the outer edge of the standard circular? Ring wall evenly distributed. The diameter of 89mm? 7mm wall thickness of PU tube, for example? Poor quality of the thickest tube wall can reach 7.5mm? The thinnest at only 5.5mm? Working in the larger pressure? Easily lead to uneven wall high temperature pneumatic tube burst or deformation? Affect the normal use.
2. Observe the presence of bubbles or other visually visible objects in the PU tube wall, and see if they are colorless and transparent. High-quality PU tube wall crystal clear? Without any impurities. The defective PU tube color yellowing? May be in the production process due to improper handling decomposition, aging? Or improper storage due to long-term.
3, high-quality PU tube in addition to a little plastic odor outside? No other petrochemical products smell. The poor steel pipe has a pungent smell of diesel oil? Especially in the hot summer? People can not be close.
4, high-quality PU tube inside and outside the pipe wall are smooth? Feel good? And low-quality pipe is more rough.
5, when measuring the wall thickness should be cut off the ends of the PU tube? Select the middle tube as a sample test to prevent some illegal manufacturers make an article in the tube at both ends of the actual wall thickness at both ends of the tube.
6, at both ends of the PU tube interception of a few centimeters of the wire? Repeated folding wire? Detection of steel wire strength and toughness. Poor quality of the wire folded a couple of will break? And high-quality PU pipe steel wire to be special tools to cut off. The quality of steel wire determines the quality of the entire pipe? Due to quality problems caused by steel pipe PU tube is prone to irreversible deformation
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