Aluminum Brass tubes – C68700 - resists the action of high-velocity salt and blackish water and is commonly used for condenser tubes. The main characteristic of C68700 is its high resistance to impingement attack. Tubes of this alloys are recommended for use in Marine and Land Power Stations, in which cooling water velocities are high. Standard Grade ASTM B 111 C68700 EN 12451 CuZn20Al2As DIN 17660/1785 CuZn20Al2 BS 2871 CZ 110 JIS H3300 C6870 GB/T8890 HAL77-2 Cu 76.0-79.0 76.0-79.0 76.0-79.0 76.0-78.0 76.0-79.0 76-79 Al 1.8-2.5 1.8-2.3 1.8-2.3 1.8-2.3 1.8-2.5 1.8-2.5 Fe 0.06 max 0.07 max 0.07 max 0.06 max 0.06 max 0.06 max Pb 0.07 max 0.05 max 0.07 max 0.07 max 0.07 max 0.03 max Zn Bal. Bal. Bal. Bal. Bal. Bal. As 0.02-0.10 0.02-0.06 0.02-0.035 0.02-0.06 0.02-0.06 0.03-0.06 P - 0.01 max 0.01 max - - 0.02 max Mn - 0.1 max 0.1 max - - - Total impurities - 0.3 max 0.1 max 0.3 max - 0.3 max Condition O61 R390 F39 M O M - R340 F34 TA - Y2 - - O - - Yield Strength N/mm2 125 min 150 min 150-230 - - - - 120 min 120-180 - - - - - - - - - Tensile Strength N/mm2 345 min. 390 min - - 373 min 370 min - 340 min - - - 350 min - - - - - - Elongation (%) - 45 min 45 min - 40 min 40 min - 55 min 55 min - - 50 min - - - - - - Hardness Hv5 - - - 150 min - - - - - 85-110 - - - - - 75 max - - Typical  use Most used copper alloy for heat exchanger tubes application. Represents the best option for any heat exchanger which is involved with saline water. The addition of arsenic has solved the problem of dezincification. Melting Point: 935°C                • Hot Working Properties: OK Density (20°C): 8,33 g/cm3      • Cold Working Properties: Very Good Weight Formula Average Wall: (OD-WT) x WT x 0,0265 = Kg/m (all sizes in mm) Minimum Wall: (OD-WT) x WT x 0,0275 = Kg/m (all sizes in mm)