ASTM B 543/B 543M:2026

1.1 This specification covers the requirements for welded tube of copper and various copper alloys up to 3¹/₈ in., inclusive, in diameter, for use in surface condensers, evaporators, heat exchangers, and general engineering applications. The following coppers or copper alloys are involved: Copper or Copper Alloy UNS No.² Type of Metal C10800^A oxygen-free, low phosphorus C12200^A DHP phosphorized, high residual phosphorus C19400 copper-iron alloy C23000 red brass C44300 arsenical admiralty C44400 antimonial admiralty C44500 phosphorized admiralty C68700 arsenical aluminum brass C70400 95-5 copper-nickel C70600 90-10 copper-nickel C70620 90-10 copper-nickel (modified for welding) C71000 80-20 copper-nickel C71500 70-30 copper-nickel C71520 70-30 copper-nickel (modified for welding) C71640 copper-nickel-iron-manganese C72200 ... 1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 The following safety hazard caveat pertains only to the test method(s) described in this specification. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Warning- Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

77.150.30