UNS C55181 (BCuP-2) Filler Metal
C55181 copper is a copper-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BCuP-2 is the AWS designation for this material. C55181 is the UNS number.
It has the lowest embodied energy among the copper-based braze fillers in the database.
The graph bars on the material properties cards below compare C55181 copper 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
110 GPa 16 x 106 psi
Poisson's Ratio
0.34
Shear Modulus
40 GPa 5.8 x 106 psi
Tensile Strength: Ultimate (UTS)
200 MPa 29 x 103 psi
Thermal Properties
Brazing Temperature
730 to 840 °C 1350 to 1550 °F
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
200 °C 390 °F
Melting Completion (Liquidus)
790 °C 1460 °F
Melting Onset (Solidus)
710 °C 1310 °F
Specific Heat Capacity
410 J/kg-K 0.1 BTU/lb-°F
Thermal Expansion
16 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
28 % relative
Density
8.5 g/cm3 530 lb/ft3
Embodied Carbon
2.4 kg CO2/kg material
Embodied Energy
38 MJ/kg 16 x 103 BTU/lb
Embodied Water
290 L/kg 34 gal/lb
Common Calculations
Stiffness to Weight: Axial
7.0 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
6.5 points
Strength to Weight: Bending
8.9 points
Thermal Shock Resistance
8.2 points
Alloy Composition
| Cu | 92.4 to 93 | |
| P | 7.0 to 7.5 | |
| res. | 0 to 0.15 |
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