Non-ferrous semi-finished products

A good price and swift availability are two important requirements where non-ferrous semi-finished products are concerned. Roba Metals combines this with a market approach which takes into account your requirements, for example the reduction of risks associated with the buyer's procurement. The constantly changing metal prices on the commodity markets require swift interaction.

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K65: The tube system for high-pressure applications

In refrigeration, and in particular in the area of supermarket refrigeration systems, more and more ecology-oriented plant concepts are being implemented. The modern, environment-friendly refrigerant CO2 that is used here leads to high operating pressures. For these applications the new K65 tube system is available. Tubes and fittings are made of the high-strength copper alloy Wieland K65 which has already been used with success in electrical engineering and the automotive industry. K65 makes save and economical installation of refrigeration systems with operating pressures up to 120 bar possible.


High-pressure pipeline systems, particularly for CO2 as a refrigerant. Further media can be used in consultation with the manufacturer.

Proven joining technology: brazing instead of welding!

K65 has excellent processing properties which are similar to those of copper. K65 tubes can be brazed to K65 fittings. K65 fittings are manufactured by IBP Conex | Bänninger. Safety ensured by two well-known manufacturersK65 tubes by Wieland and K65 fittings by IBP Conex | Bänninger fall under a joint system guarantee that includes CO2 applications up to 120 bar for the items listed below.

Easy to identify – even after installation

K65 tubes and fittings are marked appropriately, so that the system components can be clearly identified at all times. In addition, the material is slightly magnetic and can easily be distinguished from copper by means of a neodymium magnet – a helpful, practical advantage.


The main advantage is the mechanical strength of K65. Because of the high strength of the material, the K65 product series for 120 bar can be made with comparatively thin walls. The light weight of pipelines made of K65 means not only a significant saving in material, but also easier handling, for example when mounting the tubes on ceilings.