The thermal expansion for faser (MF) pipe is approximately double that of copper or steel, whereas other plastics, or PP without the faser layer, can be as much as 5 to 10 times that of copper or steel. So, while the faser layer does not reduce the expansion to be equal to metal pipe, it is much closer and as a result will require much less expansion compensation (e.g. loops, offsets, expansion joints, etc).
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