The aluminum-plastic pipes we usually call are generally made of PE (polyethylene) and aluminum.

Aluminum-plastic PPR pipes are made of PPR (polypropylene) and aluminum.

The wall thickness of aluminum-plastic pipes is smaller than that of aluminum-plastic PPR pipes

The connection method of aluminum-plastic pipes is sleeve-type pipe fittings or compression-type pipe fittings

The connection method of aluminum-plastic PPR pipe is hot-melt welding with PPR pipe fittings (note that the end face of the pipe must be bushed)

There is also a kind of pipe called plastic-aluminum steady-state pipe

And aluminum The structure of plastic PPR pipe is similar but no bushing is required during welding