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AWS BAg-35 (P07351) Filler Metal

AWS BAg-35 is a silver-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BAg-35 is the AWS designation for this material. P07351 is the UNS number.

It has a fairly high heat capacity and a fairly low density among silver-based braze fillers.

The graph bars on the material properties cards below compare AWS BAg-35 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

91 GPa 13 x 106 psi

Poisson's Ratio


Shear Modulus

34 GPa 5.0 x 106 psi

Tensile Strength: Ultimate (UTS)

170 MPa 25 x 103 psi

Thermal Properties

Brazing Temperature

750 to 840 °C 1390 to 1550 °F

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

750 °C 1390 °F

Melting Onset (Solidus)

690 °C 1270 °F

Specific Heat Capacity

330 J/kg-K 0.080 BTU/lb-°F

Thermal Expansion

21 µm/m-K

Otherwise Unclassified Properties


8.7 g/cm3 540 lb/ft3

Embodied Carbon

35 kg CO2/kg material

Embodied Energy

550 MJ/kg 240 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

5.8 points

Stiffness to Weight: Bending

17 points

Strength to Weight: Axial

5.4 points

Strength to Weight: Bending

7.8 points

Thermal Shock Resistance

6.4 points

Alloy Composition

Silver (Ag)Ag 34 to 36
Zinc (Zn)Zn 31 to 35
Copper (Cu)Cu 31 to 33
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