Zamak 7

Zamak 7 (ASTM AG40B), or Zinc Alloy 7, is a modification of Zamak 3. It is a high-purity alloy containing lower magnesium content and has a tighter impurities specification. This results in improved casting fluidity, ductility and surface finish.

Applications ideal for Zamak 7

Zamak 7 is mostly used for special hardware applications, or when castings require extra formability during subsequent assembly operations such as crimping or staking. Its higher fluidity also allows thinner walls to be cast:

  • Higher fluidity is sometimes desirable especially on components with intricate detail, however it does present special casting considerations
  • In order to avoid excessive flashing along the tool parting lines, good die fit and close control of casting process parameters is necessary
  • The high ductility exhibited by this alloy also has an impact on processing, but mainly in secondary operations for flash removal and trimming
  • Zamak 7 exhibits excellent damping capacity and vibration attenuation in comparison with aluminum die casting alloys

Mechanical Properties

Material Alloy Elongation   Tensile Strength   Yield Strength (0.2%)   Impact Strength   Shear Strength   Hardness   Process
% in 50mm
PSI x 103
PSI x 103
ft lb
PSI x 103
布氏硬度 (HB)
Zinc Casting Metals
13
41
32
43
31
80

Physical Properties

Material Alloy Density   Melting Point (Average +/- 50)   Thermal Conductivity   Coefficient of Thermal Expansion   Electrical Conductivity   Process
lb/in3
°F
BTU/h∙ft∙°F
µin/in°F
%IACS
Zinc Casting Metals
0.240
723
65.3
15.2
27.0

Composition

Zinc Casting Metals
% Zamak 7
Aluminum 3.5-4.3
Copper 0.25
Magnesium 0.005-0.02
Iron (max) 0.075
Lead (max) 0.003
Cadmium (max) 0.002
Tin (max) 0.001
Nickel (max)
Zinc Bal.
Manganese
Silicon
Other-Metallic
RoHS Compliant

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Last updated 12.23.2019