However, in addition to such obvious advantages, polyethylene pipes also have certain disadvantages, among which one can distinguish greater sensitivity to different mechanical damage, moderate fragility at low temperatures (this phenomenon can easily be passed if installation at a temperature is no less than 15 degrees), And also these pipes are characterized by significant thermal lengthening (in polyethylene, the linear expansion coefficient is 10-15 times more than that of steel). Polyethylene pipes can be transported by a temperature of no more than 45 degrees, so such pipes are not used in high -temperature water supply and heating systems.