Solder & Low-Melting Alloy Britannia Metal-O vs Britannia Metal SPUN
Solder & Low-Melting Alloy · Britannia Metal temper comparison
Britannia Metal-O and Britannia Metal SPUN are two conditions of the same solder & low-melting alloy grade, Britannia Metal: O (annealed) versus SPUN (spun / work-hardened formed part). The chemistry is identical, so every difference below comes from the condition. Britannia Metal SPUN is the stronger of the two: yield strength 52 MPa (7.54 ksi) against 22 MPa (3.19 ksi) for Britannia Metal-O, about 136% more; tensile strength follows at 82 MPa (11.9 ksi) vs 55 MPa (7.98 ksi). In exchange, Britannia Metal-O is the more ductile: elongation 45% versus 18% for Britannia Metal SPUN, and Britannia Metal SPUN is harder (31 HB vs 19 HB). Britannia Metal-O runs hotter in service (100°C vs 75°C continuous). On the shop floor, Britannia Metal SPUN machines more easily (68 vs 55 out of 100).
Britannia Metal-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Britannia Metal SPUNChoose it when strength drives the design, or when the part is machined in volume.
Britannia Metal-O vs Britannia Metal SPUN: 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.
Britannia Metal-OBritannia Metal SPUN
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 50 GPa7.3 Msi · Shear Modulus 18.5 GPa2.7 Msi · Bulk Modulus 52 GPa7.5 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Same in both: Density 7.35 g/cm³0.27 lb/in³ · Melting Point (Solidus) 235°C455 °F · Liquidus Temperature 295°C563 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 230 J/kg·K0.05 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 22.5 µm/m·K12.5 µin/in·°F · Latent Heat of Fusion 60 J/g25.8 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.5 V · Corrosion Resistance 65 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Polishability
Same in both: Castability 90 / 100 · Brazeability / Solderability 95 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 290 MJ/kg124,678 BTU/lb · Embodied Carbon (primary production) 17 kg CO₂/kg · Embodied Water 400 L/kg47.9 gal/lb · Typical Recycled Content 30%
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.
Britannia Metal-O vs Britannia Metal SPUN — frequently asked
Is Britannia Metal SPUN stronger than Britannia Metal-O?
Yes. Britannia Metal SPUN has a typical yield strength of 52 MPa (7.54 ksi) against 22 MPa (3.19 ksi) for Britannia Metal-O — about 136% more. Tensile strength is 82 MPa (11.9 ksi) vs 55 MPa (7.98 ksi).
Which condition does FabDigit quote by default, O or SPUN?
F is the default Britannia Metal condition in the FabDigit quote flow (neither O nor SPUN). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, Britannia Metal-O or Britannia Metal SPUN?
Britannia Metal SPUN, by a small margin. Both rate good for machinability — 68/100 against 55/100 for Britannia Metal-O; for welding the order is Britannia Metal-O first (poor, 30/100) then Britannia Metal SPUN (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Britannia Metal-O and Britannia Metal SPUN 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.