Identification of PVC suction hose extrusion line

In most cases, there is no detection tool and testing conditions? We can according to the visual, olfactory, tactile and other sensory rough identification of PVC suction hose quality.

observe the lumen is rules? Wall thickness is uniform. Good quality PVC suction hose cavity and the outer edge of the standard round? Ring wall distribution evenly. To diameter 89mm? Wall thickness of 7mm PVC suction hose as an example?
Poor quality of the thickest wall to reach 7.5mm? The thinnest at only 5.5mm? Working under a large pressure? Is easy to pipe wall uneven force caused PVC pipe burst or deformation? Impact of normal use.

Observe the presence or absence of bubbles or other visible material in the PVC suction hose wall. Is it colorless and transparent? High-quality PVC suction hose wall crystal clear? No impurities. And defective PVC suction hose extrusion line color yellowing may be in the production process due to improper handling of decomposition, aging or long-term improper storage due.
3, high-quality PVC suction hose extrusion line in addition to a little plastic smell outside the absence of any other petrochemical products smell. And poor steel pipe has a bad smell of diesel smell, especially in the hot summer people can not close.