Solder & Low-Melting Alloy Pb65Sn35 vs Pb74Sn25Sb1
Solder & Low-Melting Alloy · grade comparison
Solder & Low-Melting Alloy Pb65Sn35 and Pb74Sn25Sb1 are both solder & low-melting alloy grades. Both yield at about 21 MPa — strength does not separate them. Pb65Sn35 is the more ductile: elongation 55% versus 35% for Pb74Sn25Sb1. Pb65Sn35 is lighter (9.5 g/cm³ vs 9.96 g/cm³ for Pb74Sn25Sb1). On the shop floor, Pb65Sn35 welds better (poor vs not recommended).
Pb65Sn35Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
Pb65Sn35 vs Pb74Sn25Sb1: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Same in both: Poisson's Ratio 0.4 · 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)
Same in both: Corrosion Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Brazeability / Solderability
Polishability
Same in both: Formability (cold) 90 / 100 · Castability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 300 L/kg35.9 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Stiffness (E / density)
Modulus of Resilience
Same in both: Specific Strength (UTS / density) 3 kN·m/kg · Thermal Diffusivity 28.4 mm²/s · Thermal Shock Resistance Index 2
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 | Pb74Sn25Sb1 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Pb65Sn35 vs Pb74Sn25Sb1 — frequently asked
What is the difference between Pb65Sn35 and Pb74Sn25Sb1?
Solder & Low-Melting Alloy Pb65Sn35 and Pb74Sn25Sb1 are both solder & low-melting alloy grades. Both yield at about 21 MPa — strength does not separate them. Pb65Sn35 is the more ductile: elongation 55% versus 35% for Pb74Sn25Sb1.
Which is cheaper, Pb65Sn35 or Pb74Sn25Sb1?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Pb65Sn35 or Pb74Sn25Sb1?
Pb74Sn25Sb1. Its machinability rates fair (35/100) against poor (30/100) for Pb65Sn35; for welding the order is Pb65Sn35 first (poor, 20/100) then Pb74Sn25Sb1 (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Pb65Sn35 and Pb74Sn25Sb1 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.