Solder & Low-Melting Alloy Pb95Ag5
ISO 9453-182
Pb95Ag5 is a tin-free high-lead solder with 5% silver, sitting at the high-melting end of the Sn-Pb solder family.
Reference datasheet — Pb95Ag5 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 Pb95Ag5?
Pb95Ag5 is a tin-free high-lead solder with 5% silver, sitting at the high-melting end of the Sn-Pb solder family. The high remelt temperature lets it survive later reflow passes, so it is used as the first step in multi-reflow assembly and for die attach in power modules; forms include wire, cored wire, bar, preform, paste and spheres. It is soft and creep-prone — 25 MPa tensile, 35% elongation, 11 HB — with service limited to about 175 °C. Lead content confines it to RoHS-exempt applications; Pb98Ag2 gives a higher service ceiling, Pb93Sn5Ag2 better wetting. Pb95Ag5 has a density of 11.28 g/cm³ (0.408 lb/in³), heavier than 94% of solder & low-melting alloy grades. It melts at 304°C (579 °F). Pb95Ag5 has a yield strength of 15 MPa (2.18 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 82% of solder & low-melting alloy grades. Elongation at break is 35% and the elastic modulus is 20 GPa (2.9 Msi).
What is Pb95Ag5 used for?
- high-temperature electronic joints
- step-soldering in multi-reflow assembly
- power module die attach
Advantages
- High service temperature — 175°C (347 °F), better than 97% of solder & low-melting alloy grades
- Readily welded — 45/100, better than 89% of solder & low-melting alloy grades
Limitations
- Heavy — 11.28 g/cm³ (0.408 lb/in³), worse than 94% of solder & low-melting alloy grades
- Low strength — 15 MPa (2.18 ksi), worse than 82% of solder & low-melting alloy grades
- Low stiffness — 20 GPa (2.9 Msi), worse than 81% of solder & low-melting alloy grades
Pb95Ag5 properties
Typical room-temperature values; bars are the position among solder & low-melting alloy grades.
Physical3
Pb95Ag5 has a density of 11.28 g/cm³ (0.408 lb/in³), heavier than 94% of solder & low-melting alloy grades. It melts at 304°C (579 °F).
Mechanical10
Pb95Ag5 has a yield strength of 15 MPa (2.18 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 82% of solder & low-melting alloy grades. Elongation at break is 35% and the elastic modulus is 20 GPa (2.9 Msi).
Thermal6
Pb95Ag5 is rated for continuous service to 175°C (347 °F). It conducts heat at 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 62% of solder & low-melting alloy grades. Thermal expansion is 28.5 µm/m·K (15.8 µin/in·°F).
Electrical3
Pb95Ag5 conducts electricity at 8.5 % IACS, worse than 64% 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 Pb95Ag5 takes about 105 MJ of energy and emits 7.5 kg of CO₂ — less than 69% of solder & low-melting alloy grades. Typical recycled content is 50%.
Manufacturability7
Pb95Ag5's machinability is poor (30/100, worse than 60% of solder & low-melting alloy grades); weldability fair (45/100); 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 solder & low-melting alloy family
Yield strength against density for every solder & low-melting alloy grade FabDigit runs. Pb95Ag5 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Pb95Ag5
Is Pb95Ag5 easy to machine?
Extremely soft and gummy — machining is rarely done; use sharp positive-rake tools, high speed and no coolant carryover, or stamp/shear preforms instead.
Can Pb95Ag5 be welded?
Not fusion welded; it is itself a filler — solder at 380–420 °C with activated rosin or halide-bearing flux, or use flux-free reflow under H₂/formic-acid atmosphere.
Can Pb95Ag5 be formed, bent or molded?
Readily extruded into wire, rolled to ribbon and stamped into preforms at room temperature; it work-softens and creeps, so avoid stressed storage of thin sections.
Pb95Ag5 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 |
|---|---|---|
| Agsilver content defining the alloy | 4.5 – 5.5 | 5 |
| Snimpurity limit — nominally tin-free | ≤ 0.25 | |
| Sb | ≤ 0.4 | |
| Bi | ≤ 0.25 | |
| Cu | ≤ 0.08 | |
| Fe | ≤ 0.02 | |
| Zn | ≤ 0.01 | |
| Al | ≤ 0.01 | |
| As | ≤ 0.03 | |
| Cd | ≤ 0 | |
| Pb | balance |
What surface finishes work on Pb95Ag5?
Joint surface is dull grey and tarnishes; clean flux residues with saponifier or solvent — plating and polishing are not practical on the solder itself.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy Pb95Ag5 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ISO
- 9453-182
How much does Pb95Ag5 cost?
Pb95Ag5 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Pb95Ag5 — frequently asked
What is Pb95Ag5 used for?
Pb95Ag5 is typically used for high-temperature electronic joints, step-soldering in multi-reflow assembly and power module die attach. In short: high remelt temperature; tin-free high-lead solder; harder than Pb98Ag2.
What is the yield strength of Pb95Ag5?
Pb95Ag5 has a typical yield strength of 15 MPa (2.18 ksi) and a tensile strength of 24 MPa (3.48 ksi) — weaker than 82% of solder & low-melting alloy grades.
Is Pb95Ag5 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 60% of solder & low-melting alloy grades). Extremely soft and gummy — machining is rarely done; use sharp positive-rake tools, high speed and no coolant carryover, or stamp/shear preforms instead.
Can Pb95Ag5 be welded?
With care — weldability is rated fair (45/100). Not fusion welded; it is itself a filler — solder at 380–420 °C with activated rosin or halide-bearing flux, or use flux-free reflow under H₂/formic-acid atmosphere.
What surface finishes work on Pb95Ag5?
Joint surface is dull grey and tarnishes; clean flux residues with saponifier or solvent — plating and polishing are not practical on the solder itself.
Can Pb95Ag5 be formed, bent or molded?
Readily extruded into wire, rolled to ribbon and stamped into preforms at room temperature; it work-softens and creeps, so avoid stressed storage of thin sections.
What is the maximum service temperature of Pb95Ag5?
Pb95Ag5 is rated for continuous use to about 175°C (347 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Pb95Ag5 cost?
Pb95Ag5 is a high-cost solder & low-melting alloy ($$$$), 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 — ASTM International (2020)
- J-STD-006 — Requirements for Electronic Grade Solder Alloys — IPC (2013)
- ASM Handbook Vol. 6A — Welding, Brazing and Soldering (Solder alloy properties) — ASM International (2011)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Ag-Pb system) — ASM International (1992)
- High-temperature Pb-Ag solder alloy data (wire, preform, paste forms) — Indium Corporation / AIM Solder (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.