Connecticut Precision Castings, Inc.

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Mechanical Properties

  Zamak 3 Zamak 5 Zamak 7 Zamak 2 ZA-8
Ultimate Tensile Strength: psi x 103 (MPa) 41 (283) 48 (328) 41 (283) 52 (359) 54 (374)
Yield Strength - 0.2% Offset: psi x 103 (MPa) 32 (221) 39 (269) 32 (221) 41 (283) 42 (290)
Elongation: % in 2" 10 7 13 7 6-10
Shear Strength: psi x 103 (MPa) 31 (214) 38 (262) 31 (214) 46 (317) 40 (275)
Hardness: Brinell 82 91 80 100 95-110
Impact Strength: ft-lb (J) 432 (58) 482 (65) 432 (58) 352 (48) 313 (42)
Fatigue Strength Rotary Bend - 5x108 cycles: psi x 103 (MPa) 6.9 (48) 8.2 (57) 6.8 (47) 8.5 (59) 15 (103)
Compressive Yield Strength 0.1% Offset: psi x 103 (MPa) 604 (414) 874 (600) 604 (414) 934 (641) 37 (252)
Modulus of Elasticity - psi x 106 (MPa x 103) 12.46 (85.5) 12.46 (85.5) 12.46 (85.5) 12.46 (85.5) -
Poisson‘s Ratio 0.27 0.27 0.27 0.27 0.29

Physical Properties

  Zamak 3 Zamak 5 Zamak 7 Zamak 2 ZA-8
Density: lb/cu in (g/cm3) .24 (6.6) .24 (6.6) .24 (6.6) .24 (6.6) .227 (6.3)
Melting Range: ℉ (℃) 718-728 (381-387) 717-727 (380-386) 718-728 (381-387) 715-734 (379-390) 707-759 (375-404)
Electrical Conductivity: %IACS 27 26 27 25 27.7
Thermal Conductivity: BTU/ft/hr/℉ (W/m/hr/℃) 65.3 (113.0) 62.9 (108.9) 65.3 (113.0) 60.5 (104.7) 66.3 (114.7)
Coefficient of Thermal Expansion:68-212℉ μin/in/℉ (100-200℃ μm/mm/℃) 15.2 (27.4) 15.2 (27.4) 15.2 (27.4) 15.4 (27.8) 12.9 (23.3)
Specific Heat: BTU/lb/℉ (J/kg/℃) .10 (419) .10 (419) .10 (419) .10 (419) .104 (435)
Pattern of Die Shrinkage: in/in .007 .007 .007 .007 .007

Compositions

Chemical Specification (per ASTM) (% by Weight) for ZAMAK Alloys
  Zamak 3 Zamak 5 Zamak 7 Zamak 2
  Ingot Casting Ingot Casting Ingot Casting Ingot Casting
Al 3.9-4.3 3.7-4.3 3.9-4.3 3.7-4.3 3.9-4.3 3.7-4.3 3.9-4.3 3.7-4.3
Mg .03-.06 .02-.06 .03-.06 .02-.06 .01-.020 .005-.020 .025-.05 .02-.06
Cu .10 max .1 max .7-1.1 .7-1.2 .10 max .1 max 2.7-3.3 2.6-3.3
Fe (max) .035 .05 .035 .05 .035 .035 .035 .05
Pb (max) .0040 .005 .0040 .005 .0030 .003 .0040 .005
Cd (max) .0030 .004 .0030 .004 .0020 .002 .0030 .004
Sn (max) .0015 .002 .0015 .002 .0010 .001 .0015 .002
Ni (other)x10 - - - - .005-.020 .005-.020 - -
Zn Bal. Bal. Bal. Bal. Bal. Bal. Bal. Bal.


Chemical Specification (per ASTM) (% by Weight) for ZA Alloys
  ZA-8
  Ingot Casting
Al 8.2-8.8 8.0-8.8
Mg .02-.03 .01-.03
Cu 0.9-1.3 .8-1.3
Fe (max) .035 .075
Pb (max) .005 .006
Cd (max) .005 .006
Sn (max) .002 .003
Ni (other)x10 - -
Zn Bal. Bal.

Diecast Finishings

A variety of high quality surface finishes is another major advantage that zinc has over other materials.

Zinc Alloys

A list of the zinc alloys that Connecticut Precision Castings currently utilizes.

Diecast Selection

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