Today, by eliminating the weaknesses of single-layer pipes and using more resistant and insulating raw materials such as PEX and aluminum, and designing five-layer pipes as well as aluminum EVOH, the pipe manufacturers have been able to achieve suitable thermal properties and more pressure tolerance. For use in installation systems such as heating and cooling, and in addition, due to dimensional stability and insulation against oxygen and less corrosion, they can also be used in medical industries. One of the reasons for creating high resistance and adhesion of layers is the use of interlayer adhesives with polar and non-polar properties to connect each layer.