Multilayer pipes (MP) based on an alu-midlayer are making inroads. This layer works as
a barrier layer providing 100% diffusion tightness, it also reduces the length expansion
of the pipe when exposed to heat and provides larger distances between fixings due to
the higher stability. As a consequence, 30% less fixing material less time is used during
installation. MP pipes also tend to be 40% lighter then metal pipes and are easy to shape
and form.
