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AWS BAg-19 (P07925) Filler Metal

AWS BAg-19 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-19 is the AWS designation for this material. P07925 is the UNS number.

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

The graph bars on the material properties cards below compare AWS BAg-19 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 980 °C 1410 to 1800 °F

Latent Heat of Fusion

120 J/g

Melting Completion (Liquidus)

890 °C 1640 °F

Melting Onset (Solidus)

760 °C 1400 °F

Specific Heat Capacity

250 J/kg-K 0.061 BTU/lb-°F

Thermal Expansion

20 µm/m-K

Other Material Properties


10 g/cm3 650 lb/ft3

Elastic (Young's, Tensile) Modulus

74 GPa 11 x 106 psi

Poisson's Ratio


Shear Modulus

27 GPa 3.9 x 106 psi

Tensile Strength: Ultimate (UTS)

140 MPa 20 x 103 psi

Common Calculations

Stiffness to Weight: Axial

4.0 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

3.8 points

Strength to Weight: Bending

5.8 points

Thermal Shock Resistance

6.9 points

Alloy Composition

Silver (Ag)Ag 92 to 93
Copper (Cu)Cu 6.6 to 7.9
Lithium (Li)Li 0.15 to 0.3
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