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AWS BAg-8 (P07720) Filler Metal

AWS BAg-8 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-8 is the AWS designation for this material. P07720 is the UNS number.

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

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

770 to 890 °C 1410 to 1630 °F

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

780 °C 1430 °F

Melting Onset (Solidus)

780 °C 1430 °F

Specific Heat Capacity

280 J/kg-K 0.066 BTU/lb-°F

Thermal Expansion

19 µm/m-K

Other Material Properties


10 g/cm3 630 lb/ft3

Elastic (Young's, Tensile) Modulus

84 GPa 12 x 106 psi

Poisson's Ratio


Shear Modulus

31 GPa 4.4 x 106 psi

Tensile Strength: Ultimate (UTS)

150 MPa 22 x 103 psi

Common Calculations

Stiffness to Weight: Axial

4.6 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

4.1 points

Strength to Weight: Bending

6.2 points

Thermal Shock Resistance

6.7 points

Alloy Composition

Silver (Ag)Ag 71 to 73
Copper (Cu)Cu 26.9 to 29
Residualsres. 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