# 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 10 ^{6} psi*

Poisson's Ratio

0.34

Shear Modulus

40 *GPa* 5.8 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

200 *MPa* 29 *x 10 ^{3} 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/cm ^{3}* 530

*lb/ft*

^{3}Embodied Carbon

2.4 *kg CO _{2}/kg material*

Embodied Energy

38 *MJ/kg* 16 *x 10 ^{3} 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