UNS C26800 (CW506L) Yellow Brass
C26800 brass is a brass formulated for primary forming into wrought products. CW506L is the EN numeric designation for this material. C26800 is the UNS number. Additionally, the EN chemical designation is CuZn33. The British Standard (BS) designation is CZ107. And the common industry name is 66-34 Yellow Brass.
The properties of C26800 brass include nine common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C26800 brass to: wrought brasses (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
110 GPa 15 x 106 psi
Poisson's Ratio
0.31
Rockwell B Hardness
53 to 91
Shear Modulus
40 GPa 5.9 x 106 psi
Tensile Strength: Ultimate (UTS)
310 to 650 MPa 45 to 95 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
130 °C 270 °F
Melting Completion (Liquidus)
930 °C 1710 °F
Melting Onset (Solidus)
900 °C 1660 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
120 W/m-K 67 BTU/h-ft-°F
Thermal Expansion
20 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
27 % IACS
Electrical Conductivity: Equal Weight (Specific)
30 % IACS
Otherwise Unclassified Properties
Base Metal Price
24 % relative
Calomel Potential
-360 mV
Density
8.1 g/cm3 510 lb/ft3
Embodied Carbon
2.7 kg CO2/kg material
Embodied Energy
45 MJ/kg 19 x 103 BTU/lb
Embodied Water
320 L/kg 38 gal/lb
Common Calculations
Stiffness to Weight: Axial
7.2 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
11 to 22 points
Strength to Weight: Bending
13 to 21 points
Thermal Diffusivity
37 mm2/s
Thermal Shock Resistance
10 to 22 points
Alloy Composition
Among wrought copper alloys, the composition of C26800 brass is notable for containing comparatively high amounts of lead (Pb) and iron (Fe). Lead is used to improve machinability and bearing properties, at the cost of toxicity. Iron is used to increase strength inexpensively.
| Cu | 64 to 68.5 | |
| Zn | 31 to 36 | |
| Pb | 0 to 0.15 | |
| Fe | 0 to 0.050 | |
| res. | 0 to 0.3 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B36: Standard Specification for Brass Plate, Sheet, Strip, And Rolled Bar
Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993