Solder & Low-Melting Alloy Pb65Sn35 vs Pb69Sn30Sb1
Solder & Low-Melting Alloy · grade comparison
Solder & Low-Melting Alloy Pb65Sn35 and Pb69Sn30Sb1 are both solder & low-melting alloy grades. Pb69Sn30Sb1 is the stronger of the two: yield strength 26 MPa (3.77 ksi) against 21 MPa (3.05 ksi) for Pb65Sn35, about 24% more; tensile strength follows at 42 MPa (6.09 ksi) vs 33 MPa (4.79 ksi). In exchange, Pb65Sn35 is the more ductile: elongation 55% versus 35% for Pb69Sn30Sb1, and Pb69Sn30Sb1 is harder (13 HB vs 12 HB).
Pb65Sn35Choose it when the part is bent, formed or impact-loaded.
Pb69Sn30Sb1Choose it when strength drives the design.
Pb65Sn35 vs Pb69Sn30Sb1: 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
Bulk Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Compressive Strength
Hardness, Vickers
Same in both: Shear Modulus 9.5 GPa1.4 Msi · Poisson's Ratio 0.4
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)
Min Service Temperature
Same in both: Latent Heat of Fusion 38 J/g16.3 BTU/lb · Max Service Temperature (continuous) 100°C212 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.5 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Polishability
Same in both: Weldability 20 / 100 · Formability (cold) 90 / 100 · Castability 85 / 100 · Brazeability / Solderability 88 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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 | Pb69Sn30Sb1 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Pb65Sn35 vs Pb69Sn30Sb1 — frequently asked
Is Pb69Sn30Sb1 stronger than Pb65Sn35?
Yes. Pb69Sn30Sb1 has a typical yield strength of 26 MPa (3.77 ksi) against 21 MPa (3.05 ksi) for Pb65Sn35 — about 24% more. Tensile strength is 42 MPa (6.09 ksi) vs 33 MPa (4.79 ksi).
Which is cheaper, Pb65Sn35 or Pb69Sn30Sb1?
Both sit in the same relative cost tier ($$$$, 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 Pb69Sn30Sb1?
Pb69Sn30Sb1. Its machinability rates fair (35/100) against poor (30/100) for Pb65Sn35.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Pb65Sn35 and Pb69Sn30Sb1 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.