What is the difference between PE-RT/AL/PE-RT (Alpert) and Gerpex MLCP?

Both Alpert and Gerpex are Multilayer Composite Pipes, Alpert is made up of layers of PE-RT and Aluminium whereas Gerpex is made up of layers of PE-Xb (and PE-HD for sizes over 40mm) and Aluminium. Alpert is designed for UFH and low temperature heating applications due to its maximum operating temperature of 70oC. Gerpex is designed for a wide range of sanitary and heating applications. It’s maximum operating temperature is 95oC.