1.1 ,This specification establishes the requirements for seamless copper and copper-alloy rectangular tube intended for use as transmission lines in electronic equipment. Five types of material are specified having the following nominal compositions:2
| Copper or | ,Previously | Nominal Composition, % | ||
| ,Copper | ,Zinc | Phosphorus | ||
| , | , | , | , | , |
| C10100 | Copper, Type OFEA | 99.99B | ... | ... |
| C10200 | Copper, Type OFA | 99.95B | ... | ... |
| C10300 | Copper, Type OFXLPA | 99.95B | ... | 0.003 |
| C12000 | Copper, Type DLPA | 99.90B | ... | 0.008 |
| C22000 | Commercial | 90 | 10 | ... |
(A) ,Types OF, OFE, OFXLP, and DLP are described in Classification B224.