ΔT -change of temperature (ᵒC)
L - Initial length of the pipe
a - Coefficient of linear expansion for the material.

ABS - 73.8 x 10-6 Copper - 16.6 x 10-6
Aluminum - 22.2 x 10-6 Iron - 12.0 x 10-6
Brass - 18.7 x 10-6 PEX-AL-PEX - 24 x 10-6
Cast iron - 10.4 x 10-6 Polyethylene (PE) - 200 x 10-6
Cement - 10.0 x 10-6 Polypropylene (PP) - 90.5 x 10-6
CPVC - 66.6 x 10-6 PVC - 110 x 10-6
Concrete - 14.5 x 10-6 Rubber - 77 x 10-6