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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.)

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.