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1.1 ,This specification covers seamless round and rectangular including square copper alloy tube in straight lengths. Ten alloys are specified having the following nominal compositions:
| Copper | Previously | Nominal Composition, % | |||
| Alloy | Used | , | , | , | , |
| UNS No.2 | DesignationA | Copper | Zinc | Lead | Tin |
| , | , | , |
| , | , |
| C22000 | 7 | 90.0 | 10.0 | ... | ... |
| C23000 | 1 | 85.0 | 15.0 | ... | ... |
| C26000 | 2 | 70.0 | 30.0 | ... | ... |
| C27000 | 9 | 65.0 | 35.0 | ... | ... |
| C27200 | 8 | 63.0 | 37.0 | ... | ... |
| C27400 | ... | 62.5 | 37.5 | ... | ... |
| C28000 | 5 | 60.0 | 40.0 | ... | ... |
| C33000 | 3 | 66.0 | 33.5 | 0.5 | ... |
| C33200 | 4 | 66.0 | 32.4 | 1.6 | ... |
| C37000 | 6 | 60.0 | 39.0 | 1.0 | ... |
| C44300 | ... | 71.5 | 27.5 | ... | 1.00 |
(A) ,Alloy Designations of Specification B135 ,–, ,63, which was published in the 1966 Book of ASTM Standards, Part 5.