Copper pipes in accordance with EN 1057, RAL, and DVGW in accordance with worksheet GW 392
Copper is the standard material used in refrigeration and air conditioning technology and in supply systems for medical and technical gases. Copper pipes for installation technology are standardized in DIN EN 1057 (Seamless copper tubes for water and gas pipes for sanitary installations and heating systems) and are made from oxygen-free, phosphorus-deoxidized, 99.9% pure copper ‘Cu-DHP’ (material number CW024A).

DIN EN 1057 describes seamless round pipes with an outer diameter of 6 to 276 mm for cold and hot water distribution networks, hot water heating systems including surface heating systems, and for the distribution of gaseous and liquid domestic fuels and wastewater disposal. The standard also applies to plastic-coated and factory-insulated copper pipes.

Copper installation pipes are used for gas, drinking water, and heating installations and related areas.
Other areas of application: solar thermal systems, air conditioning technology, rainwater harvesting systems, technical gases and compressed air, as well as industrial applications. Pipes in accordance with EN 1057 are manufactured in soft (R220), semi-hard (R250) and hard (R290), with soft pipes (6-22 mm) usually supplied in 25 or 50 m coils, and semi-hard (12-28 mm) and hard pipes supplied in 5 m lengths.

Quality-tested copper pipes
Copper pipes in accordance with DIN EN 1057 can also be awarded a RAL quality mark by the Gütegemeinschaft Kupferrohr e.V. (Quality Association for Copper Pipes). The quality and testing specifications RAL RG 641/1 of the Gütegemeinschaft Kupferrohr contain additional requirements and regulations for testing such pipes compared to the EN 1057 standard. A current list of pipe manufacturers whose copper pipes are permitted to bear the quality mark can be found on the website of the Gütegemeinschaft Kupferrohr e.V. (Quality Association for Copper Pipes).

Quality-tested copper pipes must also bear the following markings:

- Simplified quality mark (circle with a dot in the center)
- Country of manufacture in German