Solder & Low-Melting Alloy Bi50Pb25Sn12.5Cd12.5 CAST-AGED
Heat-treated state
also Cerrobend
Pick when dimensional stability matters: the bismuth-rich alloy grows slightly for weeks after casting, so masters and gauge fillers are aged before final machining.
Values for the CAST-AGED condition
Other Bi50Pb25Sn12.5Cd12.5 tempers and conditions
Bi50Pb25Sn12.5Cd12.5 is listed in 2 conditions; see the grade overview at Bi50Pb25Sn12.5Cd12.5.
- Cast
- CAST-AGED
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CastDefault As cast | Standard condition: melt at 80–100 °C and pour into the tube, fixture or mould; measure/use within hours before age growth. | 26 | 44 | 50 | 10 HB | 3.2 % IACS |
CAST-AGEDThis page Cast and age-stabilised (held ~30 days at room temperature) | Pick when dimensional stability matters: the bismuth-rich alloy grows slightly for weeks after casting, so masters and gauge fillers are aged before final machining. | 30 | 48 | 30 | 12 HB | 3.2 % IACS |
What is Bi50Pb25Sn12.5Cd12.5 CAST-AGED?
Bi50Pb25Sn12.5Cd12.5 CAST-AGED is Bi50Pb25Sn12.5Cd12.5 heat treated to CAST-AGED — pick when dimensional stability matters: the bismuth-rich alloy grows slightly for weeks after casting, so masters and gauge fillers are aged before final machining. Bi50Pb25Sn12.5Cd12.5 CAST-AGED has a yield strength of 30 MPa (4.35 ksi) and a tensile strength of 48 MPa (6.96 ksi) — stronger than 61% of solder & low-melting alloy grades. Elongation at break is 30% and the elastic modulus is 10 GPa (1.45 Msi). Bi50Pb25Sn12.5Cd12.5 CAST-AGED has a density of 9.6 g/cm³ (0.347 lb/in³), heavier than 66% of solder & low-melting alloy grades. It melts at 70°C (158 °F). Cast is the default condition FabDigit quotes; CAST-AGED is available on request or by drawing note.
Limitations
- Low stiffness — 10 GPa (1.45 Msi), worse than 98% of solder & low-melting alloy grades
- Limited service temperature — 40°C (104 °F), worse than 97% of solder & low-melting alloy grades
- Low electrical conductivity — 3.2 % IACS, worse than 97% of solder & low-melting alloy grades
- Poor heat conductor — 18.8 W/m·K (10.9 BTU/hr·ft·°F), worse than 94% of solder & low-melting alloy grades
- Limited formability — 55/100, worse than 80% of solder & low-melting alloy grades
Bi50Pb25Sn12.5Cd12.5 CAST-AGED properties
Typical room-temperature values for Bi50Pb25Sn12.5Cd12.5 CAST-AGED; 20 are specific to this condition. Other listed values are Bi50Pb25Sn12.5Cd12.5 reference data and may not represent this condition. Bars are the position among solder & low-melting alloy grades.
Physical3
Bi50Pb25Sn12.5Cd12.5 CAST-AGED has a density of 9.6 g/cm³ (0.347 lb/in³), heavier than 66% of solder & low-melting alloy grades. It melts at 70°C (158 °F).
Mechanical11
Bi50Pb25Sn12.5Cd12.5 CAST-AGED has a yield strength of 30 MPa (4.35 ksi) and a tensile strength of 48 MPa (6.96 ksi) — stronger than 61% of solder & low-melting alloy grades. Elongation at break is 30% and the elastic modulus is 10 GPa (1.45 Msi).
Thermal6
Bi50Pb25Sn12.5Cd12.5 CAST-AGED is rated for continuous service to 40°C (104 °F). It conducts heat at 18.8 W/m·K (10.9 BTU/hr·ft·°F), worse than 94% of solder & low-melting alloy grades. Thermal expansion is 24 µm/m·K (13.3 µin/in·°F).
Electrical3
Bi50Pb25Sn12.5Cd12.5 CAST-AGED conducts electricity at 3.2 % IACS, worse than 97% of solder & low-melting alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (40/100), worse than 82% of solder & low-melting alloy grades.
Sustainability4
Producing a kilogram of Bi50Pb25Sn12.5Cd12.5 CAST-AGED takes about 92 MJ of energy and emits 6.5 kg of CO₂ — less than 72% of solder & low-melting alloy grades. Typical recycled content is 70%.
Manufacturability8
Bi50Pb25Sn12.5Cd12.5 CAST-AGED's machinability is fair (50/100, better than 73% of solder & low-melting alloy grades); weldability poor (15/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Bi50Pb25Sn12.5Cd12.5 CAST-AGED
Is Bi50Pb25Sn12.5Cd12.5 easy to machine?
Machines like soft lead — very sharp positive-rake tools, light cuts, flood coolant to keep the part below ~40 °C, and expect smearing rather than chips.
Can Bi50Pb25Sn12.5Cd12.5 be welded?
Not fusion-welded in the usual sense; joints are made by remelting the alloy itself at 80–100 °C, and it wets clean steel, brass and copper readily with rosin flux.
Can Bi50Pb25Sn12.5Cd12.5 be formed, bent or molded?
Best used as a casting alloy: melt in a water- or oil-jacketed pot at 80–100 °C (never above ~200 °C, cadmium fume), pour into warmed silicone/steel moulds; near-zero shrinkage gives sharp replication.
What surface finishes work on Bi50Pb25Sn12.5Cd12.5?
No plating or anodizing; surfaces are left as-cast or burnished, and parts should be washed and handled with gloves because of lead/cadmium contamination.
Bi50Pb25Sn12.5Cd12.5 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| PbRoHS-restricted | 24 – 26 | 25 |
| Sn | 12 – 13 | 12.5 |
| CdRoHS-restricted; toxic fume hazard on overheating | 12 – 13 | 12.5 |
| Others (each)impurities Cu, Zn, Fe, Sb typically <0.05 % each | ≤ 0.05 | — |
| Bibalance bismuth | ≥ 49 (balance) | — |
Bi50Pb25Sn12.5Cd12.5 CAST-AGED — frequently asked
What is Bi50Pb25Sn12.5Cd12.5 CAST-AGED used for?
Bi50Pb25Sn12.5Cd12.5 CAST-AGED is typically used for fire sprinkler fusible links, safety plugs, pattern/mold making, metal casting demonstrations and temperature fuses. In short: 70 °C melting point; near-zero casting shrinkage; contains lead and cadmium.
What is the yield strength of Bi50Pb25Sn12.5Cd12.5 CAST-AGED?
Bi50Pb25Sn12.5Cd12.5 CAST-AGED has a typical yield strength of 30 MPa (4.35 ksi) and a tensile strength of 48 MPa (6.96 ksi) — stronger than 61% of solder & low-melting alloy grades. Strength varies by condition: see the 2 listed tempers.
Is Bi50Pb25Sn12.5Cd12.5 CAST-AGED easy to machine?
Reasonably — machinability is rated fair (50/100, better than 73% of solder & low-melting alloy grades). Machines like soft lead — very sharp positive-rake tools, light cuts, flood coolant to keep the part below ~40 °C, and expect smearing rather than chips.
Can Bi50Pb25Sn12.5Cd12.5 CAST-AGED be welded?
Not readily — weldability is rated poor (15/100). Not fusion-welded in the usual sense; joints are made by remelting the alloy itself at 80–100 °C, and it wets clean steel, brass and copper readily with rosin flux.
What surface finishes work on Bi50Pb25Sn12.5Cd12.5 CAST-AGED?
No plating or anodizing; surfaces are left as-cast or burnished, and parts should be washed and handled with gloves because of lead/cadmium contamination.
Can Bi50Pb25Sn12.5Cd12.5 CAST-AGED be formed, bent or molded?
Best used as a casting alloy: melt in a water- or oil-jacketed pot at 80–100 °C (never above ~200 °C, cadmium fume), pour into warmed silicone/steel moulds; near-zero shrinkage gives sharp replication.
What is the maximum service temperature of Bi50Pb25Sn12.5Cd12.5 CAST-AGED?
Bi50Pb25Sn12.5Cd12.5 CAST-AGED is rated for continuous use to about 40°C (104 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys, Low-Melting (Fusible) Alloys — ASM International (1990)
- ASTM B774 — Standard Specification for Low Melting Point Alloys — ASTM International (2016)
- Fusible alloy technical data (Cerrobend / 158 °F alloy) — Cerro / Indium Corporation (2022)
- Bi-Pb-Sn-Cd eutectic thermophysical data — CRC Handbook of Chemistry and Physics (2021)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.