Solder & Low-Melting Alloy Pb65Sn35 vs Pb70Sn30
Solder & Low-Melting Alloy · grade comparison
Solder & Low-Melting Alloy Pb65Sn35 and Pb70Sn30 are both solder & low-melting alloy grades. Pb70Sn30 is the stronger of the two: tensile strength 38 MPa (5.51 ksi) against 33 MPa (4.79 ksi) for Pb65Sn35, about 15% more. In exchange, Pb65Sn35 is the more ductile: elongation 55% versus 45% for Pb70Sn30.
Pb65Sn35Choose it when the part is bent, formed or impact-loaded.
Pb70Sn30Choose it when strength drives the design.
Pb65Sn35 vs Pb70Sn30: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all solder & low-melting alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all solder & low-melting alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Fatigue Strength (Endurance Limit)
Same in both: Poisson's Ratio 0.4 · Shear Strength 26 MPa3.8 ksi · Hardness, Brinell 12 HB
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 183°C361 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Min Service Temperature
Same in both: Max Service Temperature (continuous) 100°C212 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Brazeability / Solderability
Polishability
Same in both: Machinability 30 / 100 · Formability (cold) 90 / 100 · Castability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 45%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every solder & low-melting alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Pb65Sn35 | Pb70Sn30 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Pb65Sn35 vs Pb70Sn30 — frequently asked
Is Pb70Sn30 stronger than Pb65Sn35?
Yes. Pb70Sn30 has a typical tensile strength of 38 MPa (5.51 ksi) against 33 MPa (4.79 ksi) for Pb65Sn35 — about 15% more.
Which is cheaper, Pb65Sn35 or Pb70Sn30?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, Pb65Sn35 or Pb70Sn30?
Pb65Sn35. Its weldability rates poor (20/100) against poor (15/100) for Pb70Sn30.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Pb65Sn35 and Pb70Sn30 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.