Admiralty Brass tubes C44300 / CuZn28Sn1 / CZ111 Standard is ASTM B111 establishes the seamless tube's requirements and ferrule stock of copper and various copper alloys up to 3 Vs. in. [80 mm] inclusive for use in surface condensers, evaporators, and heat exchangers. The following coppers and copper alloys are specified: Copper or Copper Alloy UNS NO. Description C44300/ CZ111/ C4430/ CuZn28Sn1 Admiralty Metals, B, C, and D Standard: ASTM B 111/B 111M, BS2871, JIS H3300, DIN1785 Description Name: ASTM B111 copper tubes, C44300 copper tubes, C44300 Admiralty brass tubes, C44300 admiralty brass pipes, CZ111 admiralty brass tubes, CuZn28Sn1 admiralty brass tubes. Size: 8mm to 76mm Wall Thickness: 0.5 to 6mm