In the past, copper pipes were mainly used in domestic installations. Today, plastic and multi-layer composite pipes are becoming more commonly used. The benefit's are obvious: Multi-layer composite pipes feature excellent flow properties and are highly resistant to incrustation, thanks to their superior chemical resistance. FRÄNKISCHE „alpex“ pipes are physiologically sound and suitable– a combination that ensures safe and easy handling, and reliability in daily use. Unlike copper pipes, plastic/metal multi-layer composite pipes are not prone to pitting corrosion.

Further advantages of plastic/metal multi-layer composite pipes are their corrosion resistance, a low thermal expansion coefficient (similar to copper),  and a high temperature resistance of up to 95°C. Furthermore, FRÄNKISCHE has only manufactured butt-welded pipes since they began manufacturing multi-layer composite pipes. If this production method is applied, the thickness of the aluminum layer is almost the same at any point on the diameter of the pipe and there is no seam thickening. When the pipe is bent, the same forces exist consistently throughout the pipe.