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UNS C66900 Manganese Brass

C66900 brass is a brass formulated for primary forming into wrought products. It has the lowest electrical conductivity and a moderately low melting temperature among wrought brasses.

The properties of C66900 brass include seven 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 C66900 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

120 GPa 17 x 106 psi

Elongation at Break

1.1 to 26 %

Poisson's Ratio


Rockwell B Hardness

65 to 100

Rockwell Superficial 30T Hardness

60 to 88

Shear Modulus

45 GPa 6.5 x 106 psi

Shear Strength

290 to 440 MPa 42 to 64 x 103 psi

Tensile Strength: Ultimate (UTS)

460 to 770 MPa 66 to 110 x 103 psi

Tensile Strength: Yield (Proof)

330 to 760 MPa 48 to 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

150 °C 300 °F

Melting Completion (Liquidus)

860 °C 1580 °F

Melting Onset (Solidus)

850 °C 1550 °F

Specific Heat Capacity

400 J/kg-K 0.095 BTU/lb-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

3.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative


8.2 g/cm3 510 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

4.6 to 200 MJ/m3

Resilience: Unit (Modulus of Resilience)

460 to 2450 kJ/m3

Stiffness to Weight: Axial

8.1 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

15 to 26 points

Strength to Weight: Bending

16 to 23 points

Thermal Shock Resistance

14 to 23 points

Alloy Composition

Among wrought copper alloys, the composition of C66900 brass is notable for including manganese (Mn). Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu)Cu 62.5 to 64.5
Zinc (Zn)Zn 22.5 to 26
Manganese (Mn)Mn 11.5 to 12.5
Iron (Fe)Fe 0 to 0.25
Lead (Pb)Pb 0 to 0.050
Residualsres. 0 to 0.2

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys