Precious Metal BAg-1a
UNS P07500
BAg-1a is a 50 % silver, cadmium-bearing Ag–Cu–Zn–Cd brazing filler (UNS P07500), a higher-silver variant of BAg-1 with a slightly higher melting range and higher joint strength.
Reference datasheet — BAg-1a 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-1a tempers and conditions
BAg-1a 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-1a is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PREFORM | Stamped rings, washers and shaped blanks | Supply form |
ROD | Straight-length bare brazing rod | Supply form |
ROD-FC | Flux-coated rod | Supply form |
STRIP | Strip / ribbon | Supply form |
WIRE | Drawn round wire / coiled feedstock | Supply form |
PASTE | Powder + flux + binder dispensable paste | Printing process |
POWDER | Atomised filler powder | Printing process |
What is BAg-1a?
BAg-1a is a 50 % silver, cadmium-bearing Ag–Cu–Zn–Cd brazing filler (UNS P07500), a higher-silver variant of BAg-1 with a slightly higher melting range and higher joint strength. It is used where BAg-1 flow behaviour is wanted with more silver, and is stocked as wire, plain and flux-coated rod, strip, preforms, powder and paste. As-brazed properties are 415 MPa tensile, 220 MPa yield, 28 % elongation and 95 HB, with service to about 200 °C. Cadmium content and silver cost are the limits; BAg-1 is the cheaper option and BAg-24 or BAg-34 the cadmium-free substitutes. BAg-1a has a density of 9.3 g/cm³ (0.336 lb/in³), lighter than 85% of precious metal grades. It melts at 627°C (1,161 °F). BAg-1a has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 67% of precious metal grades. Elongation at break is 28% and the elastic modulus is 85 GPa (12.3 Msi).
What is BAg-1a used for?
- refrigeration/AC tubing
- electrical/electronic assemblies
- instrument brazing
Advantages
- Low embodied carbon — 65 kg CO₂/kg, better than 78% of precious metal grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 89% of precious metal grades
- Needs corrosion protection — 60/100, worse than 88% of precious metal grades
- Hard to polish — 70/100, worse than 76% of precious metal grades
BAg-1a properties
Typical room-temperature values for BAg-1a-AS-BRAZED; bars are the position among precious metal grades.
Physical3
BAg-1a has a density of 9.3 g/cm³ (0.336 lb/in³), lighter than 85% of precious metal grades. It melts at 627°C (1,161 °F).
Mechanical10
BAg-1a has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 67% of precious metal grades. Elongation at break is 28% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
BAg-1a is rated for continuous service to 200°C (392 °F). It conducts heat at 90 W/m·K (52 BTU/hr·ft·°F), worse than 51% of precious metal grades. Thermal expansion is 19.5 µm/m·K (10.8 µin/in·°F).
Electrical3
BAg-1a conducts electricity at 21 % IACS, better than 57% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 88% of precious metal grades.
Sustainability3
Producing a kilogram of BAg-1a takes about 900 MJ of energy and emits 65 kg of CO₂ — less than 80% of precious metal grades. Typical recycled content is 40%.
Manufacturability5
BAg-1a's machinability is fair (45/100, better than 59% of precious metal grades); formability very good (75/100).
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-1a is highlighted; hover a dot for its name, or open the interactive family chart.
Working with BAg-1a
Is BAg-1a easy to machine?
Rarely machined — soft and gummy; if joint dressing is needed use sharp carbide tools, high speed and light cuts, and capture Cd-bearing swarf as hazardous waste.
Can BAg-1a be welded?
Not a structural weld filler; it is a brazing filler — never fusion-weld it, and never overheat above ~800 °C or Zn/Cd volatilise and the joint becomes porous.
Can BAg-1a be formed, bent or molded?
Readily rolled to strip and drawn to fine wire from cast bar; anneal between reductions and stamp preforms cold.
BAg-1a 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/ASTM B260 requirement | 49 – 51 | 50 |
| Cu | 14.5 – 16.5 | 15.5 |
| Zn | 14.5 – 18.5 | 16.5 |
| Cdtoxic; fume extraction mandatory, restricted by RoHS and potable-water/food regulations | 17 – 19 | 18 |
| other elements totalAWS A5.8 residual limit | ≤ 0.15 |
What surface finishes work on BAg-1a?
Joints wire-brush or hot-water rinse to remove corrosive flux residue; deposits polish and can be nickel/chrome plated, but plate promptly since Zn/Cd surfaces tarnish.
Equivalent designations
Standards and trade names that resolve to Precious Metal BAg-1a in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- P07500
- Also called
- AWS BAg-1a
How much does BAg-1a cost?
BAg-1a is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
BAg-1a — frequently asked
What is BAg-1a used for?
BAg-1a is typically used for refrigeration/AC tubing, electrical/electronic assemblies and instrument brazing. In short: higher silver than BAg-1; low melting range filler; cadmium-bearing, not RoHS.
What is the yield strength of BAg-1a?
BAg-1a has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 67% of precious metal grades.
Is BAg-1a easy to machine?
Reasonably — machinability is rated fair (45/100, better than 59% of precious metal grades). Rarely machined — soft and gummy; if joint dressing is needed use sharp carbide tools, high speed and light cuts, and capture Cd-bearing swarf as hazardous waste.
Can BAg-1a be welded?
Not a structural weld filler; it is a brazing filler — never fusion-weld it, and never overheat above ~800 °C or Zn/Cd volatilise and the joint becomes porous.
What surface finishes work on BAg-1a?
Joints wire-brush or hot-water rinse to remove corrosive flux residue; deposits polish and can be nickel/chrome plated, but plate promptly since Zn/Cd surfaces tarnish.
Can BAg-1a be formed, bent or molded?
Readily rolled to strip and drawn to fine wire from cast bar; anneal between reductions and stamp preforms cold.
What is the maximum service temperature of BAg-1a?
BAg-1a is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does BAg-1a cost?
BAg-1a is a high-cost precious metal ($$$$), 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)
- ASM Handbook Vol. 6 — Welding, Brazing, and Soldering (brazing filler metal data) — ASM International (1993)
- AWS Brazing Handbook, 5th ed. — AWS (2007)
- Silver brazing alloy datasheets (BAg-1/BAg-1a class) — Lucas-Milhaupt / Harris Products Group (2023)
- GB/T 10046 (2018)
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.