Precious Metal BAg-19
UNS P07925
BAg-19 (UNS P07925) is a very high silver alloy close to the Ag-Cu eutectic, with a lithium addition that gives self-fluxing action by reducing surface oxides.
Reference datasheet — BAg-19 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AS-BRAZED condition
BAg-19 tempers and conditions
BAg-19 is supplied in one standard condition, AS-BRAZED. AS-BRAZED is the default FabDigit quotes; the values on this page are for it.
Supply forms, finishes and certifications
Ways BAg-19 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
ANN-WIRE | Annealed wire / rod | Supply form |
HD-WIRE | Hard-drawn wire | Supply form |
POWDER-PASTE | Atomized powder / brazing paste | Supply form |
STRIP-FOIL | Strip / foil preform stock | Supply form |
What is BAg-19?
BAg-19 (UNS P07925) is a very high silver alloy close to the Ag-Cu eutectic, with a lithium addition that gives self-fluxing action by reducing surface oxides. It is used where corrosion resistance, conductivity and FDA-compliant food equipment joints matter, and comes as annealed or hard-drawn wire, strip and foil, and powder-paste. The as-brazed deposit gives roughly 120 MPa yield, 290 MPa tensile, 30 % elongation, 62 HB, 350 W/m·K and 85 % IACS, with service to 400 °C. Brazing at 899–954 °C in vacuum, dry hydrogen or inert gas is required, silver content makes it costly, and it must not be used on high-zinc brasses where lithium causes erosion. BAg-19 has a density of 10.35 g/cm³ (0.374 lb/in³), lighter than 51% of precious metal grades. It melts at 760°C (1,400 °F). BAg-19 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 290 MPa (42.1 ksi) — weaker than 76% of precious metal grades. Elongation at break is 30% and the elastic modulus is 78 GPa (11.3 Msi).
What is BAg-19 used for?
- food and beverage equipment
- medical device brazing
- instrumentation requiring high corrosion resistance
Advantages
- Conducts heat well — 350 W/m·K (202.2 BTU/hr·ft·°F), better than 89% of precious metal grades
- High electrical conductivity — 85 % IACS, better than 88% of precious metal grades
Limitations
- Low stiffness — 78 GPa (11.3 Msi), worse than 90% of precious metal grades
- Low strength — 120 MPa (17.4 ksi), worse than 76% of precious metal grades
BAg-19 properties
Typical room-temperature values for BAg-19-AS-BRAZED; bars are the position among precious metal grades.
Physical3
BAg-19 has a density of 10.35 g/cm³ (0.374 lb/in³), lighter than 51% of precious metal grades. It melts at 760°C (1,400 °F).
Mechanical10
BAg-19 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 290 MPa (42.1 ksi) — weaker than 76% of precious metal grades. Elongation at break is 30% and the elastic modulus is 78 GPa (11.3 Msi).
Thermal6
BAg-19 is rated for continuous service to 400°C (752 °F). It conducts heat at 350 W/m·K (202.2 BTU/hr·ft·°F), better than 89% of precious metal grades. Thermal expansion is 18.9 µm/m·K (10.5 µin/in·°F).
Electrical3
BAg-19 conducts electricity at 85 % IACS, better than 88% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 61% of precious metal grades.
Sustainability3
Producing a kilogram of BAg-19 takes about 1,450 MJ of energy and emits 100 kg of CO₂ — less than 54% of precious metal grades. Typical recycled content is 35%.
Manufacturability6
BAg-19's machinability is fair (45/100, better than 59% of precious metal grades); formability excellent (90/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the precious metal family
Yield strength against density for every precious metal grade FabDigit runs. BAg-19 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-19
Is BAg-19 easy to machine?
Rarely machined; very soft and gummy — use sharp, high-rake tools, high speed and light feeds if trimming preforms.
Can BAg-19 be welded?
Used as a brazing filler, not a weld consumable; braze at 899–954 °C in vacuum, dry hydrogen or inert gas where the Li addition reduces surface oxides.
Can BAg-19 be formed, bent or molded?
Extremely ductile in the annealed state — easily drawn, rolled to foil and stamped into rings/washers; anneal between heavy cold-work passes.
BAg-19 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 |
|---|---|---|
| Ag | 92 – 93 | 92.5 |
| Liself-fluxing oxide reducer | 0.15 – 0.3 | 0.2 |
| Znimpurity limit | ≤ 0.01 | |
| Cdimpurity limit, cadmium-free filler | ≤ 0.01 | |
| Pimpurity limit | ≤ 0.02 | |
| Pbimpurity limit | ≤ 0.03 | |
| Other (total)total of other elements | ≤ 0.15 | |
| Cu | balance |
What surface finishes work on BAg-19?
Joint fillets polish to a bright silver finish; avoid sulfide-bearing environments to prevent tarnish, and do not use on high-zinc brasses where Li causes erosion.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-19 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07925
- Also called
- AWS BAg-19
How much does BAg-19 cost?
BAg-19 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BAg-19 — frequently asked
What is BAg-19 used for?
BAg-19 is typically used for food and beverage equipment, medical device brazing and instrumentation requiring high corrosion resistance. In short: self-fluxing lithium addition; highest conductivity BAg filler; near-eutectic high-silver alloy.
What is the yield strength of BAg-19?
BAg-19 has a typical yield strength of 120 MPa (17.4 ksi) and a tensile strength of 290 MPa (42.1 ksi) — weaker than 76% of precious metal grades.
Is BAg-19 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Rarely machined; very soft and gummy — use sharp, high-rake tools, high speed and light feeds if trimming preforms.
Can BAg-19 be welded?
Used as a brazing filler, not a weld consumable; braze at 899–954 °C in vacuum, dry hydrogen or inert gas where the Li addition reduces surface oxides.
What surface finishes work on BAg-19?
Joint fillets polish to a bright silver finish; avoid sulfide-bearing environments to prevent tarnish, and do not use on high-zinc brasses where Li causes erosion.
Can BAg-19 be formed, bent or molded?
Extremely ductile in the annealed state — easily drawn, rolled to foil and stamped into rings/washers; anneal between heavy cold-work passes.
What is the maximum service temperature of BAg-19?
BAg-19 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BAg-19 cost?
BAg-19 is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.8M/A5.8 Specification for Filler Metals for Brazing and Braze Welding — AWS (2019)
- ASTM B260 Standard Specification for Brazing Filler Metal — ASTM International (2022)
- Brazing Handbook, 5th ed. — American Welding Society (2007)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper Development Association silver-copper alloy property data — CDA (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.