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UNS C99750 Manganese White Brass

C99750 brass is a brass formulated for casting. It has a fairly low base cost among cast brasses. In addition, it has the lowest electrical conductivity and a fairly high embodied energy.

The properties of C99750 brass include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C99750 brass to: cast 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

Brinell Hardness

110 to 120

Elastic (Young's, Tensile) Modulus

130 GPa 18 x 106 psi

Elongation at Break

20 to 30 %

Poisson's Ratio


Rockwell B Hardness

77 to 82

Shear Modulus

48 GPa 6.9 x 106 psi

Tensile Strength: Ultimate (UTS)

450 to 520 MPa 65 to 75 x 103 psi

Tensile Strength: Yield (Proof)

220 to 280 MPa 32 to 40 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

160 °C 330 °F

Melting Completion (Liquidus)

840 °C 1550 °F

Melting Onset (Solidus)

820 °C 1500 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative


8.1 g/cm3 500 lb/ft3

Embodied Carbon

3.1 kg CO2/kg material

Embodied Energy

51 MJ/kg 22 x 103 BTU/lb

Embodied Water

310 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

87 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

190 to 300 kJ/m3

Stiffness to Weight: Axial

8.6 points

Stiffness to Weight: Bending

21 points

Strength to Weight: Axial

15 to 18 points

Strength to Weight: Bending

16 to 18 points

Thermal Shock Resistance

13 to 15 points

Alloy Composition

Among cast copper alloys, the composition of C99750 brass is notable for containing comparatively high amounts of nickel (Ni) and aluminum (Al). Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance. It also creates the need for additional care during casting. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.

Copper (Cu)Cu 55 to 61
Manganese (Mn)Mn 17 to 23
Zinc (Zn)Zn 17 to 23
Nickel (Ni)Ni 0 to 5.0
Aluminum (Al)Al 0.25 to 3.0
Lead (Pb)Pb 0.5 to 2.5
Iron (Fe)Fe 0 to 1.0
Residualsres. 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015