Precious Metal BAg-2 · finish state
Precious Metal BAg-2 FOIL
Properties of the FOIL condition, compared with the other BAg-2 tempers.
Use for furnace/vacuum-style sandwich joints where an exact, pre-placed filler volume is needed.
What is BAg-2 FOIL?
BAg-2 FOIL is BAg-2 supplied in the FOIL condition — use for furnace/vacuum-style sandwich joints where an exact, pre-placed filler volume is needed. BAg-2 FOIL has a yield strength of 200 MPa (29 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 50% of precious metal grades. Elongation at break is 20% and the elastic modulus is 83 GPa (12 Msi). BAg-2 FOIL has a density of 9.4 g/cm³ (0.34 lb/in³), lighter than 82% of precious metal grades. It melts at 607°C (1,125 °F). WIRE is the default condition FabDigit quotes; FOIL is available on request or by drawing note.
Advantages
- Easy to machine — 55/100, better than 86% of precious metal grades
- Low embodied carbon — 55 kg CO₂/kg, better than 86% of precious metal grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 89% of precious metal grades
- Needs corrosion protection — 58/100, worse than 89% of precious metal grades
- Limited ductility — 20%, worse than 77% of precious metal grades
- Hard to polish — 70/100, worse than 77% of precious metal grades
BAg-2 FOIL properties
Typical room-temperature values for BAg-2 FOIL — 2 properties are specific to this condition; the rest are grade-level values shared by every BAg-2 temper. Each bar shows where the value sits among the precious metal grades in FabDigit's library — further right is higher.
Physical3
BAg-2 FOIL has a density of 9.4 g/cm³ (0.34 lb/in³), lighter than 82% of precious metal grades. It melts at 607°C (1,125 °F).
Mechanical9
BAg-2 FOIL has a yield strength of 200 MPa (29 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 50% of precious metal grades. Elongation at break is 20% and the elastic modulus is 83 GPa (12 Msi).
Thermal5
BAg-2 FOIL is rated for continuous service to 200°C (392 °F). It conducts heat at 100 W/m·K (57.8 BTU/hr·ft·°F), better than 55% of precious metal grades. Thermal expansion is 19.5 µm/m·K (10.8 µin/in·°F).
Electrical3
BAg-2 FOIL conducts electricity at 21 % IACS, better than 56% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 89% of precious metal grades.
Sustainability3
Producing a kilogram of BAg-2 FOIL takes about 620 MJ of energy and emits 55 kg of CO₂ — less than 91% of precious metal grades. Typical recycled content is 45%.
Manufacturability5
BAg-2 FOIL's machinability is good (55/100, better than 86% of precious metal grades); formability excellent (90/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other BAg-2 tempers and conditions
BAg-2 is also supplied in 8 other conditions. The full side-by-side table is on the BAg-2 overview.
- WIREDefaultDefault stock form for automated feeding, hand-fed torch brazing and for cutting into rings; annealed for easy forming.430 MPa tensile
- FOILUse for furnace/vacuum-style sandwich joints where an exact, pre-placed filler volume is needed.450 MPa tensile
Working with BAg-2 FOIL
Is BAg-2 easy to machine?
Soft and gummy — machine only for preform trimming with sharp, high-rake tools; avoid generating fine dust because of cadmium toxicity.
Can BAg-2 be welded?
Not a structural weld filler; it is applied by brazing. Use an AWS FB3-A white flux or an inert/reducing furnace atmosphere, and do not braze in vacuum furnaces because of cadmium volatilisation.
Can BAg-2 be formed, bent or molded?
Excellent cold formability — readily drawn to fine wire, rolled to 0.05 mm foil and stamped into rings and preforms.
What surface finishes work on BAg-2?
Fillets can be polished bright; remove corrosive flux residue with hot water/acid pickle; brazed assemblies can be plated if the Zn/Cd surface is properly cleaned.
BAg-2 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| AgAWS A5.8 BAg-2 / UNS P07350 | 34 – 36 | 35 |
| Cu | 25 – 27 | 26 |
| Cdtoxic — fume hazard, RoHS restricted | 17 – 19 | 18 |
| Other (total)total of all other elements | ≤ 0.15 | — |
| Znremainder, nominally 19–23% | balance | — |
BAg-2 FOIL — frequently asked
What is BAg-2 FOIL used for?
BAg-2 FOIL is typically used for general fabrication brazing, steel and copper alloy joints, tool and die brazing and plumbing fittings. In short: widest melting range BAg; economical 35 % silver; good gap-filling ability.
What is the yield strength of BAg-2 FOIL?
BAg-2 FOIL has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 50% of precious metal grades. Strength varies by condition: see the 9 listed tempers.
Is BAg-2 FOIL easy to machine?
Reasonably — machinability is rated good (55/100, better than 86% of precious metal grades). Soft and gummy — machine only for preform trimming with sharp, high-rake tools; avoid generating fine dust because of cadmium toxicity.
Can BAg-2 FOIL be welded?
Not a structural weld filler; it is applied by brazing. Use an AWS FB3-A white flux or an inert/reducing furnace atmosphere, and do not braze in vacuum furnaces because of cadmium volatilisation.
What surface finishes work on BAg-2 FOIL?
Fillets can be polished bright; remove corrosive flux residue with hot water/acid pickle; brazed assemblies can be plated if the Zn/Cd surface is properly cleaned.
Can BAg-2 FOIL be formed, bent or molded?
Excellent cold formability — readily drawn to fine wire, rolled to 0.05 mm foil and stamped into rings and preforms.
What is the maximum service temperature of BAg-2 FOIL?
BAg-2 FOIL is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- AWS A5.8M/A5.8 Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering — ASM International (1993)
- Brazing Handbook, 5th ed. — American Welding Society (2007)
- Silver brazing alloy datasheets (35% Ag Cd-bearing grades) — Lucas-Milhaupt / Handy & Harman (2022)
- GB/T 10046 (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.