  
wood's metal alloy; cerro bend; onion's fusible alloy; wood's metal; fusible alloy; bismuth/lead/tin/cadmium alloy; bendalloy; pewtalloy; Sn + Pb + Bi + Cd; lipowitz's alloy; CAS # 8049-22-7,
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Wood's Metal Designations:
Chemical Name: Bismuth alloy
Chemical Formula: Sn + Pb + Bi + Cd
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Wood's Metal General Description:
a) A low melting fusible alloy.
b) There are many alloys that melt at low temperatures. These are called fusible alloys. You may have heard of a famous one, called Wood's Metal. Wood's metal is a mixture of 50% bismuth, 25% lead, 12.5% tin, and 12.5% cadmium. It melts at a temperature of 158° Fahrenheit (70° Celcius).
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Wood's Metal Typical Chemical Purities Available:
Sn= 12.5%, Pb= 25.0%, Bi= 50% and Cd= 12.5%
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Wood's Metal Typical Granulations Available:
Various granulations are available
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Wood's Metal Typical Physical Constants:
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Density (g/cm3)
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Specific Gravity
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Solid Specific Heat
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0.041
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Melting Point (°C)
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70
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Boiling Point (°C)
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Latent Heat of Fusion (Btu/lbs.)
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17.2
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Thermal Conductivity @20°C (cal/s-cm-°C)
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Mohs Hardness @20°C
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Crystallography
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- Related Low Melting Alloys:
Alloy
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Melting point
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Eutectic?
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Bismuth
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Lead
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Tin
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Indium
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Cadmium
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Thalium
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Rose's metal
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98 °C (208 °F)
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no
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50%
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25 %
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–
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–
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25%
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–
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Cerrosafe
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74 °C (165 °F)
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no
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49%
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37.7%
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11.3%
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–
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8.5%
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–
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Wood's metal
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70 °C (158 °F)
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yes
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50%
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26.7%
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13.3%
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–
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10%
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–
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Field's metal
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62 °C (144 °F)
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yes
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32.5%
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–
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16.5%
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51%
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–
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–
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Cerrolow 136
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58 °C (136 °F)
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yes
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49%
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18%
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12%
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21%
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–
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–
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Cerrolow 117
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47.2 °C (117 °F)
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yes
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44.7%
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22.6%
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8.3%
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19.1%
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5.3%
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–
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Bi-Pb-Sn-Cd-In-Tl
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41.5 °C (107 °F)
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yes
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40.3 %
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22.2%
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10.7%
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17.7 %
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8.1%
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1.1 %
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Wood's Metal Possible Applications:
a) Heating baths in laboratories, antifriction metals, solders
b) Wood's metal is useful as a low-melting solder, low-temperature casting metal, high temperature coupling fluid in heat baths, and as a fire-melted valve element in fire sprinkler systems in buildings. Medical gas cylinders in the United Kingdom have a Wood's metal seal which melts in fire, allowing the gas to escape and reducing the risk of gas explosion.
c) A common use is as a filler when bending thin-walled metal tubes. For this use the tubing is filled with molten Wood's metal. After the filler solidifies the tubing is bent, and the filler prevents collapse of the tubing. The Wood's metal is then removed by heating, often by boiling in water.
d) Other uses include making custom-shaped apertures and blocks (for example, electron-beam cutouts and lung blocks) for medical radiation treatment, and making metal inlays in wood.
e) Wood's metal is also useful for repairing antiques. For example, a bent piece of sheet metal may be repaired by casting a Wood's metal die from a good example. The low melting temperature of Wood's metal makes it unlikely this will harm the original. The damaged piece can then be clamped in the die and slowly tightened to form it back into shape.
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Wood's Metal Packaging Options:
Drums
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Wood's Metal TSCA (SARA Title III) Status:
Listed. For further information please call the E.P.A. at +1.202-554-1404
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Wood's Metal Chemical Abstract Service Number:
CAS# 8049-22-7
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