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UNS C68100 (RBCuZn-C) Filler Metal

C68100 brass is a copper-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. RBCuZn-C is the AWS designation for this material. C68100 is the UNS number.

The graph bars on the material properties cards below compare C68100 brass to: copper-based braze fillers (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

29 %

Poisson's Ratio

0.3

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

380 MPa 55 x 103 psi

Tensile Strength: Yield (Proof)

140 MPa 20 x 103 psi

Thermal Properties

Brazing Temperature

910 to 950 °C 1670 to 1750 °F

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 240 °F

Melting Completion (Liquidus)

890 °C 1630 °F

Melting Onset (Solidus)

870 °C 1590 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

98 W/m-K 57 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

24 % IACS

Electrical Conductivity: Equal Weight (Specific)

27 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

86 MJ/m3

Resilience: Unit (Modulus of Resilience)

94 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

13 points

Strength to Weight: Bending

15 points

Thermal Diffusivity

32 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Copper (Cu) 56 to 60
Zinc (Zn) 36.4 to 43
Tin (Sn) 0.75 to 1.1
Iron (Fe) 0.25 to 1.3
Manganese (Mn) 0.010 to 0.5
Silicon (Si) 0.040 to 0.15
Lead (Pb) 0 to 0.050
Aluminum (Al) 0 to 0.010
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding

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