Menu (ESC)

UNS C37100 Leaded Brass

C37100 brass is a brass formulated for primary forming into wrought products.

The properties of C37100 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 C37100 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

100 GPa 15 x 106 psi

Elongation at Break

8.0 to 40 %

Poisson's Ratio


Rockwell Superficial 30T Hardness

43 to 71

Shear Modulus

40 GPa 5.8 x 106 psi

Shear Strength

260 to 300 MPa 37 to 44 x 103 psi

Tensile Strength: Ultimate (UTS)

370 to 520 MPa 54 to 75 x 103 psi

Tensile Strength: Yield (Proof)

150 to 390 MPa 22 to 57 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 240 °F

Melting Completion (Liquidus)

900 °C 1650 °F

Melting Onset (Solidus)

890 °C 1630 °F

Specific Heat Capacity

380 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

120 W/m-K 69 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

30 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative


8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

45 MJ/kg 20 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

38 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

110 to 750 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

13 to 18 points

Strength to Weight: Bending

14 to 18 points

Thermal Diffusivity

39 mm2/s

Thermal Shock Resistance

12 to 17 points

Alloy Composition

Among wrought copper alloys, the composition of C37100 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.

Copper (Cu)Cu 58 to 62
Zinc (Zn)Zn 36.3 to 41.4
Lead (Pb)Pb 0.6 to 1.2
Iron (Fe)Fe 0 to 0.15
Residualsres. 0 to 0.4

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