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AWS BAg-1a (P07500) Filler Metal

AWS BAg-1a is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-1a is the AWS designation for this material. P07500 is the UNS number.

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

The graph bars on the material properties cards below compare AWS BAg-1a 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

77 GPa 11 x 106 psi

Poisson's Ratio


Shear Modulus

29 GPa 4.2 x 106 psi

Tensile Strength: Ultimate (UTS)

180 MPa 26 x 103 psi

Thermal Properties

Brazing Temperature

640 to 760 °C 1180 to 1400 °F

Latent Heat of Fusion

120 J/g

Melting Completion (Liquidus)

640 °C 1180 °F

Melting Onset (Solidus)

630 °C 1160 °F

Specific Heat Capacity

280 J/kg-K 0.068 BTU/lb-°F

Thermal Expansion

22 µm/m-K

Otherwise Unclassified Properties


9.3 g/cm3 580 lb/ft3

Embodied Carbon

48 kg CO2/kg material

Embodied Energy

760 MJ/kg 330 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

4.6 points

Stiffness to Weight: Bending

15 points

Strength to Weight: Axial

5.4 points

Strength to Weight: Bending

7.6 points

Thermal Shock Resistance

7.5 points

Alloy Composition

Silver (Ag)Ag 49 to 51
Cadmium (Cd)Cd 17 to 19
Zinc (Zn)Zn 14.5 to 18.5
Copper (Cu)Cu 14.5 to 16.5
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