Material designation Material properties and typical applications EN Cu-DHP Chemical composition* Wieland-K20/K21/28 is a deoxidized copper with limited residual phosphorus content possessing excellent welding and hard soldering properties as well as resistance to hydrogen embrittlement. It also has excellent formability and is used where requirements for electrical conductivity are not high. K21 has a particularly high purity, making it possible to achieve very low yield strength values for soft tubes. Physical properties* Types of delivery Electrical MS/m > 45 Thermal expansion coefficient *Reference values at room temperature The BU Extruded Products supplies bars, wire, sections and tubes. Please get in touch with your contact person regarding the available delivery forms, dimensions and tempers. Corrosion resistance Resistant to industrial atmosphere, industrial and drinking water (max. flow rate approx. 1.5 to 2 m/s), pure water vapour, non oxidizing acids, alkalis (except for ammoniacal and cyanide-containing compounds), neutral saline solutions. Not resistant to oxidizing acids, moist ammonia and halogenated gases, hydrogen sulphide, seawater. Fabrication properties Soft soldering Product standards Tube EN 12449 Wieland-K20/K21/K28 I BU Extruded Products I Wieland Group

Mechanical properties according to EN Wieland-Werke AG I Graf-Arco-StraB.e 36 I 89079 Ulm I Germany [email protected] I wieland.com This printed matter is not subject to revision. No claims can be derived from it unless there is evidence of intent or gross negligence. The product characteristics are not guaranteed and do not replace our experts' advice.