21. Uncommon among copper alloys , Tungum alloy can be precipitation hardened using heat treatment techniques. 22. Faster antimicrobial efficacies were associated with higher copper alloy content. 23. These developments are creating markets for antimicrobial copper and copper alloys in interior architecture. 24. Standard silver was defined as 1485 parts pure silver to 179 parts copper alloy . 25. Manufacturers learned to sandwich a copper alloy into vault doors. 26. This is of particular concern for copper alloy products such as brass and bronze. 27. Modern adhesives permit application of copper alloys to steel hulls without creating galvanic corrosion. 28. Contacts are made of copper or copper alloys , silver alloys and other highly conductive materials. 29. Common casting metals are aluminum, magnesium, and copper alloys . 30. It was also lighter than the edging of copper alloy used in earlier Roman shields.
