Specialty Materials Division - Fusible Alloys

Fusible Alloys

AIM is a leading supplier of fusible alloys for a broad range of Tool & Die applications.AIM fusible alloys are low melting temperature alloys that contain bismuth, lead, tin, cadmium or indium.  AIM’s fusible alloys are utilized in a broad variety of tool & die applications, including casting, tube bending, machining parts for soft metal dies, fixturing, anchoring parts, toggle dies and supporting castings and interrupted cuts.

These silvery white alloys expand only ~3.3% of their volume when changing from liquid to solid form, which makes these alloys ideal for many industrial applications.  AIM fusible alloys are rarely consumed in an operation and therefore can be remelted and used multiple times. 

These alloys are normally used in gravity casting but also can be used in other casting methods. 

Fusible Alloys Applications Information:

  • AIM 47:  low-temperature solder; fixturing delicate parts for machining; lens blocking; proof casting of cavities; dental models; fusible element in safety devices and alarms; radiation blocking for x-rays.

  • AIM 58:  lens blocking; proof casting; fusible element in safety devices; anchoring parts for machining; sealing adjustment screws; holding jet engine blades for machining and broaching; filler for supporting castings in interrupted cuts.

  • AIM 70:  punch and die in short run sheet metal forming; external and internal support for bending tubing extrusions; holding jet engine blades for machining and broaching; annealing and nitriding seals; nests for feeding stations.

  • AIM 124:  fusible element in pressure safety plugs; anchoring metal parts in glass; filler for large diameter tubes for bending; proof casting forging dies; liquid metal in constant temperature and heat treating baths; duplicate patterns in pottery making and foundry; mechanical dentistry.

  • AIM 138:  fusible element in safety devices; locator members in aircraft fixtures; holding jet engine blades for machining; joggle dies; foundry patterns; potting molds for electronic encapsulation; low temperature solder; soft metal dies for wax patterns in investment casting.

  • AIM 71 – 88:  for many of the same applications as AIM 70 but where less growth is required; mechanical dentistry.

  • AIM 138 – 170:  closely parallels AIM 138 applications but is normally preferred for fusible mandrels for electroforming; proof casting large dies and molds.

  • Other Compositions:  AIM can furnish other fusible alloy compositions to meet your unique requirements.

 

Specifications & Applications Information On Commonly Used AIM Fusible Alloys

AIM Fusible Alloy

47

58

70

Composition %

Bismuth

44.7

49

50

Lead

22.6

18

26.7

Tin

8.3

12

13.3

Cadmium

5.3

 

10

Indium

19.1

21

 

Melting Temp. (°C)

47

58

158

Density lb/in3

.32

.31

.339

Brinell Hardness Number

12

14

9.2

Tensile Strength lb/in2

5400

6300

5990

% Elongation

1.5

50

200

Conductivity (% of IACS)

4.50%

2.43%

4.00%

CTE In/In PPM/°C

25

23

22

Liquid Specific Heat

.035

.032

.040

Solid Specific Heat

.035

.032

.040

Latent Heat of Fusion BTU/lb

6

8

14

Growth-Shrinkage Time After Casting

2 Minutes

+.0005

+.0003

+.0025

6 Minutes

+.0002

+.0002

+.0027

30 Minutes

 .0000

+.0001

+.0045

1 Hour

 .0001

 .0000

+.0051

5 Hours

-.0002

-.0002

+.0051

24 Hours

-.0002

-.0002

+.0051

500 Hours

-.0002

-.0002

+.0057