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AWS BVAg-8b (P07728) Vacuum Service Filler Metal

AWS BVAg-8b is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BVAg-8b is the AWS designation for this material. P07728 is the UNS number.

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

The graph bars on the material properties cards below compare AWS BVAg-8b 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

800 to 900 °C 1470 to 1650 °F

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

800 °C 1460 °F

Melting Onset (Solidus)

780 °C 1430 °F

Specific Heat Capacity

280 J/kg-K 0.067 BTU/lb-°F

Thermal Expansion

19 µm/m-K

Other Material Properties

Density

10 g/cm³ 630 lb/ft³

Elastic (Young's, Tensile) Modulus

84 GPa 12 x 10⁶ psi

Poisson's Ratio

0.36

Shear Modulus

31 GPa 4.5 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

170 MPa 25 x 10³ psi

Common Calculations

Stiffness to Weight: Axial

4.7 points

Stiffness to Weight: Bending

15 points

Strength to Weight: Axial

4.7 points

Strength to Weight: Bending

6.8 points

Thermal Shock Resistance

7.6 points

Alloy Composition

Silver (Ag)Ag		70.5 to 72.5
Copper (Cu)Cu		26.8 to 29.2
Nickel (Ni)Ni		0.3 to 0.7
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