Solder & Low-Melting Alloy Pb95Sn5
ASTM B32 Sn5 · ISO 9453-123
Pb95Sn5 is a near-pure-lead solder (ASTM B32 Sn5) with a small tin addition, used where a high remelt temperature of about 310 °C is required.
Reference datasheet — Pb95Sn5 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 Cast condition
Pb95Sn5 tempers and conditions
Pb95Sn5 is supplied in 2 conditions, soft to hard. Cast is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CastDefault 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 |
Supply forms, finishes and certifications
Ways Pb95Sn5 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CORED | Flux-cored wire | Supply form |
PASTE | Solder paste | Printing process |
AsSoldered | As-soldered joint | Supply option |
What is Pb95Sn5?
Pb95Sn5 is a near-pure-lead solder (ASTM B32 Sn5) with a small tin addition, used where a high remelt temperature of about 310 °C is required. It suits high-temperature step soldering, seam sealing and die-attach preforms, and is supplied cast, extruded, as cored wire, paste and in the as-soldered condition. Strength is low at 24 MPa tensile and 13 MPa yield with 45 % elongation and 9.5 HB, but the 150 °C service limit is the highest in this Sn-Pb group. Minimal tin gives sluggish wetting that needs active flux and preheat; Pb98Sn2 raises the solidus further at the cost of even weaker joints. Pb95Sn5 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). Pb95Sn5 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).
What is Pb95Sn5 used for?
- high-temperature step soldering
- sealing seams
- die attach preforms
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 properties
Typical room-temperature values for Pb95Sn5-Cast; bars are the position among solder & low-melting alloy grades.
Physical3
Pb95Sn5 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 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 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 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 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'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. 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. Pb95Sn5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Pb95Sn5
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).
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 |
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.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy Pb95Sn5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B32 Sn5
- ISO
- 9453-123
How much does Pb95Sn5 cost?
Pb95Sn5 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Pb95Sn5 — frequently asked
What is Pb95Sn5 used for?
Pb95Sn5 is typically used for high-temperature step soldering, sealing seams and die attach preforms. In short: highest service temperature here; step-solder base alloy; near-pure lead, poor wetting.
What is the yield strength of Pb95Sn5?
Pb95Sn5 has a typical yield strength of 13 MPa (1.89 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 87% of solder & low-melting alloy grades. Strength varies by condition: see the 2 listed tempers.
Is Pb95Sn5 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 82% of solder & low-melting alloy grades). Practically unmachinable — extremely soft and gummy; it smears and loads tooling, so parts are cast, extruded or stamped instead.
Can Pb95Sn5 be welded?
Not readily — weldability is rated poor (20/100). Not fusion-welded; joints are made by soldering, and remelt temperature (~310 °C) is the whole point of the alloy for step-soldering.
What surface finishes work on Pb95Sn5?
No plating or anodizing; joints should be flux-residue cleaned, and the dull grey surface can be brightened only mechanically.
Can Pb95Sn5 be formed, bent or molded?
Extrudes and rolls easily at room temperature into wire, ribbon and preforms with no annealing needed (lead recrystallises at RT).
What is the maximum service temperature of Pb95Sn5?
Pb95Sn5 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Pb95Sn5 cost?
Pb95Sn5 is a high-cost solder & low-melting alloy ($$$$), 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
- 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; 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.