Solder & Low-Melting Alloy Pb95Sn5 Cast
Grade · default condition
ASTM B32 Sn5 · ISO 9453-123
Cast = as cast
Standard stock form for solder pots, dip/wave and hand-dipped hermetic sealing; buy this unless a wire or paste form is required.
Values for the Cast condition
Other Pb95Sn5 tempers and conditions
Pb95Sn5 is listed in 2 conditions; see the grade overview at Pb95Sn5.
- Cast
- Extruded
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CastDefaultThis page As cast | Standard stock form for solder pots, dip/wave and hand-dipped hermetic sealing; buy this unless a wire or paste form is required. | 13 | 24 | 45 | 10 HB | 8.2 % IACS |
solid wire, ribbon and stamped preforms | Choose for hand soldering, automated wire feed and preform placement where a controlled solder volume is needed. | 15 | 27 | 50 | 10 HB | 8.2 % IACS |
What is Pb95Sn5 Cast?
Pb95Sn5 Cast is Pb95Sn5 in the Cast grade — standard stock form for solder pots, dip/wave and hand-dipped hermetic sealing; buy this unless a wire or paste form is required. Pb95Sn5 Cast has a yield strength of 13 MPa (1.89 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 87% of solder & low-melting alloy grades. Elongation at break is 45% and the elastic modulus is 18 GPa (2.61 Msi). Pb95Sn5 Cast has a density of 11.03 g/cm³ (0.398 lb/in³), heavier than 91% of solder & low-melting alloy grades. It melts at 308°C (586 °F).
Advantages
- High service temperature — 150°C (302 °F), better than 92% of solder & low-melting alloy grades
- Low embodied carbon — 2.2 kg CO₂/kg, better than 88% of solder & low-melting alloy grades
- Ductile — tolerates forming and impact — 45%, better than 84% of solder & low-melting alloy grades
Limitations
- Hard to polish — 15/100, worse than 99% of solder & low-melting alloy grades
- Heavy — 11.03 g/cm³ (0.398 lb/in³), worse than 91% of solder & low-melting alloy grades
- Low strength — 13 MPa (1.89 ksi), worse than 87% of solder & low-melting alloy grades
- Low stiffness — 18 GPa (2.61 Msi), worse than 82% of solder & low-melting alloy grades
Pb95Sn5 Cast properties
Typical room-temperature values for Pb95Sn5 Cast; 18 are specific to this condition. Other listed values are Pb95Sn5 reference data and may not represent this condition. Bars are the position among solder & low-melting alloy grades.
Physical3
Pb95Sn5 Cast has a density of 11.03 g/cm³ (0.398 lb/in³), heavier than 91% of solder & low-melting alloy grades. It melts at 308°C (586 °F).
Mechanical12
Pb95Sn5 Cast has a yield strength of 13 MPa (1.89 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 87% of solder & low-melting alloy grades. Elongation at break is 45% and the elastic modulus is 18 GPa (2.61 Msi).
Thermal6
Pb95Sn5 Cast is rated for continuous service to 150°C (302 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 64% of solder & low-melting alloy grades. Thermal expansion is 28.5 µm/m·K (15.8 µin/in·°F).
Electrical3
Pb95Sn5 Cast conducts electricity at 8.2 % IACS, worse than 71% 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 Pb95Sn5 Cast takes about 30 MJ of energy and emits 2.2 kg of CO₂ — less than 86% of solder & low-melting alloy grades. Typical recycled content is 60%.
Manufacturability8
Pb95Sn5 Cast's machinability is poor (25/100, worse than 82% of solder & low-melting alloy grades); weldability poor (20/100); formability excellent (95/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Pb95Sn5 Cast
Is Pb95Sn5 easy to machine?
Practically unmachinable — extremely soft and gummy; it smears and loads tooling, so parts are cast, extruded or stamped instead.
Can Pb95Sn5 be welded?
Not fusion-welded; joints are made by soldering, and remelt temperature (~310 °C) is the whole point of the alloy for step-soldering.
Can Pb95Sn5 be formed, bent or molded?
Extrudes and rolls easily at room temperature into wire, ribbon and preforms with no annealing needed (lead recrystallises at RT).
What surface finishes work on Pb95Sn5?
No plating or anodizing; joints should be flux-residue cleaned, and the dull grey surface can be brightened only mechanically.
Pb95Sn5 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 |
|---|---|---|
| SnASTM B32 alloy grade Sn5 / J-STD-006 Pb95Sn5 | 4.5 – 5.5 | 5 |
| Sb | ≤ 0.5 | — |
| Bi | ≤ 0.25 | — |
| Cu | ≤ 0.08 | — |
| Ag | ≤ 0.02 | — |
| Fe | ≤ 0.02 | — |
| Zn | ≤ 0.01 | — |
| Al | ≤ 0.01 | — |
| As | ≤ 0.03 | — |
| Cd | ≤ 0 | — |
| Pbbalance ≈95 % | balance | — |
Pb95Sn5 Cast — frequently asked
What is Pb95Sn5 Cast used for?
Pb95Sn5 Cast is typically used for high-temperature step soldering, sealing seams and die attach preforms. In short: highest service temperature here; step-solder base alloy; near-pure lead, poor wetting.
What is the yield strength of Pb95Sn5 Cast?
Pb95Sn5 Cast has a typical yield strength of 13 MPa (1.89 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 87% of solder & low-melting alloy grades. Strength varies by condition: see the 2 listed tempers.
Is Pb95Sn5 Cast easy to machine?
Not especially — machinability is rated poor (25/100, worse than 82% of solder & low-melting alloy grades). Practically unmachinable — extremely soft and gummy; it smears and loads tooling, so parts are cast, extruded or stamped instead.
Can Pb95Sn5 Cast be welded?
Not readily — weldability is rated poor (20/100). Not fusion-welded; joints are made by soldering, and remelt temperature (~310 °C) is the whole point of the alloy for step-soldering.
What surface finishes work on Pb95Sn5 Cast?
No plating or anodizing; joints should be flux-residue cleaned, and the dull grey surface can be brightened only mechanically.
Can Pb95Sn5 Cast be formed, bent or molded?
Extrudes and rolls easily at room temperature into wire, ribbon and preforms with no annealing needed (lead recrystallises at RT).
What is the maximum service temperature of Pb95Sn5 Cast?
Pb95Sn5 Cast 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.
Sources
- ASTM B32 — Standard Specification for Solder Metal (alloy grade Sn5) — ASTM International (2020)
- J-STD-006 — Requirements for Electronic Grade Solder Alloys (Pb95Sn5) — IPC/JEDEC (2013)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys (Pb and Pb-Sn alloys) — ASM International (1990)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Pb-Sn system) — ASM International (1992)
- High-lead solder alloy property tables (5Sn/95Pb) — solder alloy producers (Indium Corporation / AIM class data) (2023)
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.