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AWS BVAg-31 (P07587) Vacuum Service Filler Metal

AWS BVAg-31 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAg-31 is the AWS designation for this material. P07587 is the UNS number.

It has a moderately high tensile strength among silver-based braze fillers. In addition, it has a moderately high density and a fairly high melting temperature.

The graph bars on the material properties cards below compare AWS BVAg-31 to: silver-based braze fillers (top), all alloys in the same category (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.

Thermal Properties

Brazing Temperature

850 to 890 °C 1570 to 1630 °F

Latent Heat of Fusion

150 J/g

Melting Completion (Liquidus)

850 °C 1570 °F

Melting Onset (Solidus)

820 °C 1520 °F

Specific Heat Capacity

280 J/kg-K 0.068 BTU/lb-°F

Thermal Expansion

18 µm/m-K

Other Material Properties


10 g/cm3 630 lb/ft3

Elastic (Young's, Tensile) Modulus

90 GPa 13 x 106 psi

Poisson's Ratio


Shear Modulus

33 GPa 4.8 x 106 psi

Tensile Strength: Ultimate (UTS)

180 MPa 26 x 103 psi

Common Calculations

Stiffness to Weight: Axial

4.9 points

Stiffness to Weight: Bending

15 points

Strength to Weight: Axial

4.9 points

Strength to Weight: Bending

7.0 points

Thermal Shock Resistance

7.8 points

Alloy Composition

Silver (Ag)Ag 57 to 59
Copper (Cu)Cu 31 to 33
Palladium (Pd)Pd 8.0 to 12
Carbon (C)C 0 to 0.0050
Phosphorus (P)P 0 to 0.0020
Lead (Pb)Pb 0 to 0.0020
Zinc (Zn)Zn 0 to 0.0010
Cadmium (Cd)Cd 0 to 0.0010

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