Solder & Low-Melting Alloy Pb65Sn35
ISO 9453-115
Pb65Sn35 is a lead-heavy tin-lead soft solder with a broad 183–247 °C pasty range, giving slow solidification for wiped and filled joints.
Reference datasheet — Pb65Sn35 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 Pb65Sn35?
Pb65Sn35 is a lead-heavy tin-lead soft solder with a broad 183–247 °C pasty range, giving slow solidification for wiped and filled joints. It is chosen for cable jointing and hand-formed seams where the filler must be paddled or wiped into place, and is supplied as bar, solid and cored wire, foil and paste. Mechanical values are low — 32 MPa tensile, 20 MPa yield, 55 % elongation, 12 HB — with a machinability score of 30 and creep under sustained load. Lead content excludes potable-water and RoHS work; Pb60Sn40 or Pb50Sn50 give better wetting and a narrower freezing range. Pb65Sn35 has a density of 9.5 g/cm³ (0.343 lb/in³), heavier than 65% of solder & low-melting alloy grades. It melts at 183°C (361 °F). Pb65Sn35 has a yield strength of 21 MPa (3.05 ksi) and a tensile strength of 33 MPa (4.79 ksi) — weaker than 72% of solder & low-melting alloy grades. Elongation at break is 55% and the elastic modulus is 26 GPa (3.77 Msi).
What is Pb65Sn35 used for?
- cable jointing
- wiping solder
- sheet metal work
Advantages
- Ductile — tolerates forming and impact — 55%, better than 96% of solder & low-melting alloy grades
Pb65Sn35 properties
Typical room-temperature values; bars are the position among solder & low-melting alloy grades.
Physical3
Pb65Sn35 has a density of 9.5 g/cm³ (0.343 lb/in³), heavier than 65% of solder & low-melting alloy grades. It melts at 183°C (361 °F).
Mechanical10
Pb65Sn35 has a yield strength of 21 MPa (3.05 ksi) and a tensile strength of 33 MPa (4.79 ksi) — weaker than 72% of solder & low-melting alloy grades. Elongation at break is 55% and the elastic modulus is 26 GPa (3.77 Msi).
Thermal6
Pb65Sn35 is rated for continuous service to 100°C (212 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), worse than 52% of solder & low-melting alloy grades. Thermal expansion is 25 µm/m·K (13.9 µin/in·°F).
Electrical3
Pb65Sn35 conducts electricity at 9.5 % IACS, better than 51% 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 Pb65Sn35 takes about 128 MJ of energy and emits 6.7 kg of CO₂ — less than 63% of solder & low-melting alloy grades. Typical recycled content is 45%.
Manufacturability7
Pb65Sn35's machinability is poor (30/100, worse than 60% of solder & low-melting alloy grades); weldability poor (20/100); 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. Pb65Sn35 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Pb65Sn35
Is Pb65Sn35 easy to machine?
Extremely soft and gummy — use sharp high-rake tools, low speed, generous lubricant; cutting is rarely needed since the alloy is shear-cut or cast to size.
Can Pb65Sn35 be welded?
Not fusion welded; joints are made by soldering the alloy itself — work in the 183–247 °C pasty range and avoid disturbing the joint before full solidification.
Can Pb65Sn35 be formed, bent or molded?
Readily cast, extruded, rolled and hand-wiped/paddle-shaped while pasty; recrystallises at room temperature so it never work-hardens permanently.
Pb65Sn35 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 grade Sn35A | 34 – 36 | 35 |
| SbSn35B variant allows 1.6–2.0 % Sb (antimonial) | ≤ 0.2 | 0.05 |
| Bi | ≤ 0.25 | |
| Cu | ≤ 0.08 | |
| Ag | ≤ 0.02 | |
| Fe | ≤ 0.02 | |
| Zn | ≤ 0.01 | |
| Al | ≤ 0.01 | |
| As | ≤ 0.03 | |
| Pbbalance ≈ 65 % | balance |
What surface finishes work on Pb65Sn35?
Remove flux residues (rosin: solvent/saponifier; acid: hot water) to prevent corrosion; surfaces can be lacquered or tinned but not anodized.
Equivalent designations
Standards and trade names that resolve to Solder & Low-Melting Alloy Pb65Sn35 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ISO
- 9453-115
How much does Pb65Sn35 cost?
Pb65Sn35 is a high-cost solder & low-melting alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Pb65Sn35 — frequently asked
What is Pb65Sn35 used for?
Pb65Sn35 is typically used for cable jointing, wiping solder and sheet metal work. In short: widest pasty range grade; lead-sheath wiping solder; low tin, low cost.
What is the yield strength of Pb65Sn35?
Pb65Sn35 has a typical yield strength of 21 MPa (3.05 ksi) and a tensile strength of 33 MPa (4.79 ksi) — weaker than 72% of solder & low-melting alloy grades.
Is Pb65Sn35 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 60% of solder & low-melting alloy grades). Extremely soft and gummy — use sharp high-rake tools, low speed, generous lubricant; cutting is rarely needed since the alloy is shear-cut or cast to size.
Can Pb65Sn35 be welded?
Not readily — weldability is rated poor (20/100). Not fusion welded; joints are made by soldering the alloy itself — work in the 183–247 °C pasty range and avoid disturbing the joint before full solidification.
What surface finishes work on Pb65Sn35?
Remove flux residues (rosin: solvent/saponifier; acid: hot water) to prevent corrosion; surfaces can be lacquered or tinned but not anodized.
Can Pb65Sn35 be formed, bent or molded?
Readily cast, extruded, rolled and hand-wiped/paddle-shaped while pasty; recrystallises at room temperature so it never work-hardens permanently.
What is the maximum service temperature of Pb65Sn35?
Pb65Sn35 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Pb65Sn35 cost?
Pb65Sn35 is a high-cost solder & low-melting alloy ($$$$), 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)
- GB/T 3131 (2020)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Soldering section) — ASM International (1993)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys (Tin and Tin Alloys) — ASM International (1990)
- Sn-Pb solder alloy property tables — Indium Corporation / Kester (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.