Solder & Low-Melting Alloy Sn60Pb40E vs Sn99Cu0.7Ag0.3
Solder & Low-Melting Alloy · grade comparison
Solder & Low-Melting Alloy Sn60Pb40E and Sn99Cu0.7Ag0.3 are both solder & low-melting alloy grades. Sn60Pb40E is the stronger of the two: yield strength 30 MPa (4.35 ksi) against 22 MPa (3.19 ksi) for Sn99Cu0.7Ag0.3, about 36% more; tensile strength follows at 50 MPa (7.25 ksi) vs 35 MPa (5.08 ksi). In exchange, Sn99Cu0.7Ag0.3 is the more ductile: elongation 40% versus 35% for Sn60Pb40E, and Sn60Pb40E is harder (16 HB vs 13 HB). Sn99Cu0.7Ag0.3 is lighter (7.37 g/cm³ vs 8.5 g/cm³ for Sn60Pb40E) and Sn99Cu0.7Ag0.3 is stiffer (47 GPa vs 30 GPa).
Sn60Pb40EChoose it when strength drives the design.
Sn99Cu0.7Ag0.3Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
Sn60Pb40E vs Sn99Cu0.7Ag0.3: 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
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Same in both: Hardness, Vickers 14 HV
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)
Same in both: Min Service Temperature -55°C-67 °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
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Same in both: Polishability 20 / 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 | Sn60Pb40E | Sn99Cu0.7Ag0.3 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Sn60Pb40E vs Sn99Cu0.7Ag0.3 — frequently asked
Is Sn60Pb40E stronger than Sn99Cu0.7Ag0.3?
Yes. Sn60Pb40E has a typical yield strength of 30 MPa (4.35 ksi) against 22 MPa (3.19 ksi) for Sn99Cu0.7Ag0.3 — about 36% more. Tensile strength is 50 MPa (7.25 ksi) vs 35 MPa (5.08 ksi).
Which is cheaper, Sn60Pb40E or Sn99Cu0.7Ag0.3?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Sn60Pb40E or Sn99Cu0.7Ag0.3?
Sn60Pb40E, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for Sn99Cu0.7Ag0.3.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Sn60Pb40E and Sn99Cu0.7Ag0.3 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.