1. We can judge whether it is qualified by observing its stiffness, the higher the stiffness, the less doped substances in this material, the better the quality, and can be purchased.
2. If there is a steel pipe cross-section, we can judge it by observing its cross-section, under normal circumstances, the cross-section of unqualified products is oval.
3. The diameter of the metal threading pipe is almost uniform, and the change is not very large.
These three points are the basic conditions for judging its qualification, and when you buy these products in the future, you can choose according to these conditions, hoping that you can buy qualified products.
The reason for using it is to ensure the stability of the wire, because the laying environment of the wire is uncertain, and the normal operation of the wire can not be guaranteed in some occasions with a certain risk factor, and the JDG metal wire can exist in those strong acid and alkali, strong corrosive environment, so that we can put the wire in the wire to ensure the normal operation of the wire.