Solder & Low-Melting Alloy Bi50Pb25Sn12.5Cd12.5 vs Bi58Sn42
Solder & Low-Melting Alloy · grade comparison
Solder & Low-Melting Alloy Bi50Pb25Sn12.5Cd12.5 and Bi58Sn42 are both solder & low-melting alloy grades. Bi58Sn42 is the stronger of the two: yield strength 42 MPa (6.09 ksi) against 26 MPa (3.77 ksi) for Bi50Pb25Sn12.5Cd12.5, about 62% more; tensile strength follows at 65 MPa (9.43 ksi) vs 44 MPa (6.38 ksi). In exchange, Bi50Pb25Sn12.5Cd12.5 is the more ductile: elongation 50% versus 40% for Bi58Sn42, and Bi58Sn42 is harder (22 HB vs 10 HB). Bi58Sn42 is lighter (8.56 g/cm³ vs 9.6 g/cm³ for Bi50Pb25Sn12.5Cd12.5) and Bi58Sn42 is stiffer (42 GPa vs 10 GPa). On the shop floor, Bi50Pb25Sn12.5Cd12.5 machines more easily (fair vs poor).
Bi50Pb25Sn12.5Cd12.5Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
Bi58Sn42Choose it when strength drives the design, or when weight is the constraint.
Bi50Pb25Sn12.5Cd12.5 vs Bi58Sn42: 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
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Bulk Modulus
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
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
Max Service Temperature (continuous)
Min Service Temperature
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) -0.45 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
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 | Bi50Pb25Sn12.5Cd12.5 | Bi58Sn42 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Bi50Pb25Sn12.5Cd12.5 vs Bi58Sn42 — frequently asked
Is Bi58Sn42 stronger than Bi50Pb25Sn12.5Cd12.5?
Yes. Bi58Sn42 has a typical yield strength of 42 MPa (6.09 ksi) against 26 MPa (3.77 ksi) for Bi50Pb25Sn12.5Cd12.5 — about 62% more. Tensile strength is 65 MPa (9.43 ksi) vs 44 MPa (6.38 ksi).
Which is cheaper, Bi50Pb25Sn12.5Cd12.5 or Bi58Sn42?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Bi50Pb25Sn12.5Cd12.5 or Bi58Sn42?
Bi50Pb25Sn12.5Cd12.5. Its machinability rates fair (45/100) against poor (30/100) for Bi58Sn42; for welding the order is Bi58Sn42 first (poor, 20/100) then Bi50Pb25Sn12.5Cd12.5 (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Bi50Pb25Sn12.5Cd12.5 and Bi58Sn42 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.