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AWS BVAg-32 (P07547) Vacuum Service Filler Metal

AWS BVAg-32 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAg-32 is the AWS designation for this material. P07547 is the UNS number.

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

The graph bars on the material properties cards below compare AWS BVAg-32 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

950 to 980 °C 1740 to 1800 °F

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

950 °C 1740 °F

Melting Onset (Solidus)

900 °C 1650 °F

Specific Heat Capacity

270 J/kg-K 0.064 BTU/lb-°F

Thermal Expansion

17 µm/m-K

Other Material Properties


11 g/cm3 660 lb/ft3

Elastic (Young's, Tensile) Modulus

93 GPa 13 x 106 psi

Poisson's Ratio


Shear Modulus

34 GPa 4.9 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

14 points

Strength to Weight: Axial

4.7 points

Strength to Weight: Bending

6.7 points

Thermal Shock Resistance

8.0 points

Alloy Composition

Silver (Ag)Ag 53 to 55
Palladium (Pd)Pd 23 to 27
Copper (Cu)Cu 20 to 22
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