Polyamide, or PA tube, called Nylon tube.
It is a synthetic fiber with good physical and chemical properties and mechanical properties: it is wear-resistant and can be used in the conditions of sand and iron. Smooth surface, reduce resistance, can prevent rust and fouling. Soft, easy to bend, easy to install, easy to process.
It is also steel, which can be shaped like metal tubes when it needs a certain shape, and it does not require complicated equipment and tooling. Be able to withstand a lot of chemical corrosion; Stable size and low permeability; High resistance can be used as an insulator; Life is long, even decades; Good temperature tolerance, can be in work - 40-100 ° C environment.