Solder & Low-Melting Alloy Sn92Cu6Ag2
Sn92Cu6Ag2 is a high-copper, high-silver lead-free tin solder, the most heavily alloyed member of the Sn-Cu-Ag group, reaching about 55 MPa tensile and 36 MPa yield with 20% elongation at 18 HB.
Reference datasheet — Sn92Cu6Ag2 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.
What is Sn92Cu6Ag2?
Sn92Cu6Ag2 is a high-copper, high-silver lead-free tin solder, the most heavily alloyed member of the Sn-Cu-Ag group, reaching about 55 MPa tensile and 36 MPa yield with 20% elongation at 18 HB. It is used for specialty industrial joints needing more strength and a higher melting range than SAC or eutectic Sn-Ag, and is supplied as bar, solid and flux-cored wire, paste, preforms and powder. The 217–380 °C pasty range means hot tooling, slow freezing and difficulty with thin sections or fast dip soldering. Sn95Cu4Ag1 is the nearest alternative with a narrower melting range. Sn92Cu6Ag2 has a density of 7.35 g/cm³ (0.266 lb/in³), lighter than 84% of solder & low-melting alloy grades. It melts at 217°C (423 °F). Sn92Cu6Ag2 has a yield strength of 38 MPa (5.51 ksi) and a tensile strength of 58 MPa (8.41 ksi) — stronger than 85% of solder & low-melting alloy grades. Elongation at break is 22% and the elastic modulus is 50 GPa (7.25 Msi).
What is Sn92Cu6Ag2 used for?
- Specialty high-strength lead-free solder joints
- Industrial fabrication soldering
- Pot and iron soldering of heavy copper hardware
- High-liquidus step soldering ahead of lower-melting alloys
- Cast bar and drawn wire filler stock
- Stamped preforms and dispensed paste
Advantages
- Conducts heat well — 62 W/m·K (35.8 BTU/hr·ft·°F), better than 93% of solder & low-melting alloy grades
- High service temperature — 150°C (302 °F), better than 92% of solder & low-melting alloy grades
- Stiff — 50 GPa (7.25 Msi), better than 86% of solder & low-melting alloy grades
- High strength — 38 MPa (5.51 ksi), better than 85% of solder & low-melting alloy grades
- Lightweight — 7.35 g/cm³ (0.266 lb/in³), better than 84% of solder & low-melting alloy grades
Limitations
- High embodied carbon — 20 kg CO₂/kg, worse than 86% of solder & low-melting alloy grades
- Limited ductility — 22%, worse than 81% of solder & low-melting alloy grades
Sn92Cu6Ag2 properties
Typical room-temperature values; bars are the position among solder & low-melting alloy grades.
Physical3
Sn92Cu6Ag2 has a density of 7.35 g/cm³ (0.266 lb/in³), lighter than 84% of solder & low-melting alloy grades. It melts at 217°C (423 °F).
Mechanical11
Sn92Cu6Ag2 has a yield strength of 38 MPa (5.51 ksi) and a tensile strength of 58 MPa (8.41 ksi) — stronger than 85% of solder & low-melting alloy grades. Elongation at break is 22% and the elastic modulus is 50 GPa (7.25 Msi).
Thermal6
Sn92Cu6Ag2 is rated for continuous service to 150°C (302 °F). It conducts heat at 62 W/m·K (35.8 BTU/hr·ft·°F), better than 93% of solder & low-melting alloy grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
Sn92Cu6Ag2 conducts electricity at 12 % IACS, better than 79% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 52% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of Sn92Cu6Ag2 takes about 330 MJ of energy and emits 20 kg of CO₂ — more than 86% of solder & low-melting alloy grades. Typical recycled content is 25%.
Manufacturability6
Sn92Cu6Ag2's machinability is poor (25/100, worse than 82% of solder & low-melting alloy grades); formability very good (80/100).
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 solder & low-melting alloy family
Yield strength against density for every solder & low-melting alloy grade FabDigit runs. Sn92Cu6Ag2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Sn92Cu6Ag2
Is Sn92Cu6Ag2 easy to machine?
Extremely soft and gummy — use very sharp high-rake tools, high speed and light cuts with kerosene-type lubricant; machining is rarely done other than trimming preforms.
Can Sn92Cu6Ag2 be welded?
Not welded; it is itself a filler — join by soldering with active rosin or halide-activated flux at 400–450 °C pot/iron temperature.
Can Sn92Cu6Ag2 be formed, bent or molded?
Casts into bars and extrudes/draws readily into wire, foil and stamped preforms; the wide 217–380 °C pasty range makes thin-section casting and fast dip freezing tricky.
Sn92Cu6Ag2 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 |
|---|---|---|
| Cuforms Cu6Sn5 dispersion; raises liquidus strongly | 5.5 – 6.5 | 6 |
| AgAg3Sn strengthening, improves wetting | 1.5 – 2.5 | 2 |
| Pbimpurity limit, RoHS lead-free | ≤ 0.07 | |
| Sbimpurity limit | ≤ 0.05 | |
| Biimpurity limit | ≤ 0.05 | |
| Feimpurity limit | ≤ 0.02 | |
| Znimpurity limit — degrades wetting | ≤ 0 | |
| Alimpurity limit — degrades wetting | ≤ 0 | |
| Cdimpurity limit | ≤ 0 | |
| Snbalance, ≈92 % | balance |
What surface finishes work on Sn92Cu6Ag2?
No anodizing; joints are cleaned of flux residue (saponifier or IPA) and may be conformal-coated — do not plate or polish the solder itself.
How much does Sn92Cu6Ag2 cost?
Sn92Cu6Ag2 is a high-cost solder & low-melting alloy ($$$$), 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.
Sn92Cu6Ag2 — frequently asked
What is Sn92Cu6Ag2 used for?
Sn92Cu6Ag2 is typically used for specialty high-strength lead-free solder joints, industrial fabrication soldering, pot and iron soldering of heavy copper hardware, high-liquidus step soldering ahead of lower-melting alloys, cast bar and drawn wire filler stock and stamped preforms and dispensed paste. In short: highest-strength Sn-Cu-Ag solder; widest pasty range; specialty industrial filler.
What is the yield strength of Sn92Cu6Ag2?
Sn92Cu6Ag2 has a typical yield strength of 38 MPa (5.51 ksi) and a tensile strength of 58 MPa (8.41 ksi) — stronger than 85% of solder & low-melting alloy grades.
Is Sn92Cu6Ag2 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 82% of solder & low-melting alloy grades). Extremely soft and gummy — use very sharp high-rake tools, high speed and light cuts with kerosene-type lubricant; machining is rarely done other than trimming preforms.
Can Sn92Cu6Ag2 be welded?
Not welded; it is itself a filler — join by soldering with active rosin or halide-activated flux at 400–450 °C pot/iron temperature.
What surface finishes work on Sn92Cu6Ag2?
No anodizing; joints are cleaned of flux residue (saponifier or IPA) and may be conformal-coated — do not plate or polish the solder itself.
Can Sn92Cu6Ag2 be formed, bent or molded?
Casts into bars and extrudes/draws readily into wire, foil and stamped preforms; the wide 217–380 °C pasty range makes thin-section casting and fast dip freezing tricky.
What is the maximum service temperature of Sn92Cu6Ag2?
Sn92Cu6Ag2 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Sn92Cu6Ag2 cost?
Sn92Cu6Ag2 is a high-cost solder & low-melting alloy ($$$$), 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
- ISO 9453 Soft solder alloys — Chemical compositions and forms — ISO (2020)
- GB/T 20422 (2018)
- ASTM B32 Standard Specification for Solder Metal — ASTM International (2020)
- ASM Handbook Vol. 6 — Welding, Brazing and Soldering (solder alloy property tables) — ASM International (1993)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Sn-Cu, Sn-Ag-Cu) — ASM International (2016)
- Lead-free solder alloy datasheets (bar / wire / paste forms) — solder alloy producers (2023)
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.