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AWS BVAg-6b (P07507) Vacuum Service Filler Metal

AWS BVAg-6b is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAg-6b is the AWS designation for this material. P07507 is the UNS number.

It has a moderately high tensile strength and a moderately high melting temperature among silver-based braze fillers.

The graph bars on the material properties cards below compare AWS BVAg-6b 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.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

93 GPa 14 x 106 psi

Poisson's Ratio


Shear Modulus

35 GPa 5.0 x 106 psi

Tensile Strength: Ultimate (UTS)

180 MPa 26 x 103 psi

Thermal Properties

Brazing Temperature

870 to 980 °C 1600 to 1800 °F

Latent Heat of Fusion

160 J/g

Melting Completion (Liquidus)

870 °C 1600 °F

Melting Onset (Solidus)

780 °C 1430 °F

Specific Heat Capacity

310 J/kg-K 0.074 BTU/lb-°F

Thermal Expansion

19 µm/m-K

Otherwise Unclassified Properties


9.7 g/cm3 610 lb/ft3

Embodied Carbon

49 kg CO2/kg material

Embodied Energy

770 MJ/kg 330 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

5.3 points

Stiffness to Weight: Bending

16 points

Strength to Weight: Axial

5.1 points

Strength to Weight: Bending

7.3 points

Thermal Shock Resistance

7.4 points

Alloy Composition

Silver (Ag)Ag 49 to 51
Copper (Cu)Cu 49 to 51
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