Solder & Low-Melting Alloy Sn99.9-CR vs Sn99.9-O
Solder & Low-Melting Alloy · Sn99.9 temper comparison
Sn99.9-CR and Sn99.9-O are two conditions of the same solder & low-melting alloy grade, Sn99.9: CR (cold rolled) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. Sn99.9-CR is the stronger of the two: yield strength 11 MPa (1.6 ksi) against 8 MPa (1.16 ksi) for Sn99.9-O, about 38% more; tensile strength follows at 20 MPa (2.9 ksi) vs 15 MPa (2.18 ksi). Sn99.9-CR is harder — 5 HB against 4 HB for Sn99.9-O — which matters for wear surfaces and threads.
Sn99.9-CRChoose it when strength drives the design, or when surface hardness matters.
Sn99.9-CR vs Sn99.9-O: 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.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 44 GPa6.4 Msi · Shear Modulus 18 GPa2.6 Msi · Bulk Modulus 58 GPa8.4 Msi · Poisson's Ratio 0.36
Physical
Density and transition temperatures.
Same in both: Density 7.29 g/cm³0.26 lb/in³ · Melting Point (Solidus) 232°C449 °F · Liquidus Temperature 232°C450 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 66.6 W/m·K38.5 BTU/hr·ft·°F · Specific Heat Capacity 228 J/kg·K0.05 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 23 µm/m·K12.8 µin/in·°F · Latent Heat of Fusion 59 J/g25.5 BTU/lb · Max Service Temperature (continuous) 100°C212 °F · Min Service Temperature 13°C55 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 15 % IACS · Electrical Resistivity 1.15×10⁻⁷ Ω·m4.53 µΩ·in
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 %)
Formability (cold)
Same in both: Weldability 40 / 100 · Castability 95 / 100 · Brazeability / Solderability 100 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 320 MJ/kg137,575 BTU/lb · Embodied Carbon (primary production) 18 kg CO₂/kg · Embodied Water 700 L/kg83.9 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.
Sn99.9-CR vs Sn99.9-O — frequently asked
Is Sn99.9-CR stronger than Sn99.9-O?
Yes. Sn99.9-CR has a typical yield strength of 11 MPa (1.6 ksi) against 8 MPa (1.16 ksi) for Sn99.9-O — about 38% more. Tensile strength is 20 MPa (2.9 ksi) vs 15 MPa (2.18 ksi).
Which condition does FabDigit quote by default, CR or O?
Specify the condition in the material field or the drawing note; FabDigit prices the quote for the state you call out.
When should I choose Sn99.9-CR over Sn99.9-O?
Pick Sn99.9-CR when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Sn99.9-CR and Sn99.9-O 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.