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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:

CopperPreviously Nominal Composition, %AlloyUsedUNSDesignationNo.Copper ZincLeadTinC22000790.010.0 ......C23000185.015.0 ......C26000270.030.0 ......C27000965.035.0 ......C27200863.037.0 ......C27400...62.537.5 ......C28000560.040.0 ......C33000366.033.5 0.5...C33200466.032.4 1.6...C37000660.039.0 1.0...C44300...71.527.5 ...1.00^A Alloy Designations of ASTM Specification B135 - 63, which was published in the 1966 Book of ASTM Standards, Part 5.

Note 1—A complete metric companion to Specification B135 has been developed-B135M; therefore, no metric equivalents are presented in this specification.

1.2 Warning—Mercury is a definite health hazard in use and disposal. (See 10.1.)