SEMCO Enterprises, Inc. Established 1973
Semco Enterprises, Inc. Providing Zinc Alloys Worldwide
475 S. Wilson Way, City of Industry, California 91744
Phone (626) 333-2237 Fax (626) 369-3882
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ZA 3 Ingots on alloy feet

Die Cast Alloys


Semco Enterprises, Inc. manufacturers the range of ZAMAK and ZA alloys. The most common zinc alloy, ZAMAK 3, satisfies most die casting needs with it's high strength, hardness and low melting point. The other ZAMAK alloys: ZAMAK 2, ZAMAK 5, and ZAMAK 7; have a similar range of Aluminum but differ with their Magnesium and Copper ranges thus resulting in different mechanical and physical properties.

The majority of die cast alloys are produced by pressure die casting. There are two techniques for pressure die casting; hot and cold chamber. Hot chamber die casting is primarily used for ZAMAK and ZA8 alloys, because of the low melting points. It produces at a high production rate even with intrigue casts. Cold chamber casting is used for Zinc alloys that have higher melting points. The metal must be ladled into an injection cylinder thus the production rates are less.

Photo: ZA 3 Ingots on alloy feet.

Chemical Specification (per ASTM B240-07) for ZAMAK Alloys
  #3 #2 #5 #7
Aluminum (Al) 3.9 - 4.3 3.9 - 4.3 3.9 - 4.3 3.9 - 4.3
Copper (Cu) 0.10 Max 2.67- 3.3 0.7 - 1.1 0.10 Max
Magnesium (Mg) 0.03 - 0.06 0.025 - 0.050 0.030 - 0.060 0.010 - 0.020
Lead (Pb) 0.004 Max 0.004 Max 0.004 Max 0.003 Max
Tin (Sn) 0.0015 Max 0.0015 Max 0.0015 Max 0.001 Max
Cadmium (Cd) 0.003 Max 0.003 Max 0.003 Max 0.002 Max
Iron (Fe) 0.035 Max 0.035 Max 0.035 Max 0.075 Max
Zinc (Zn) Balance Balance Balance Balance

Chemical Specification (per ASTM B240-07) for ZA Alloys
  ZA-8 ZA-12 ZA-27
Aluminum (Al) 8.2 - 8.8 10.8 - 11.5 25.5 - 28.0
Copper (Cu) 0.90 - 1.3 0.5 - 1.2 2.0 - 2.5
Magnesium (Mg) 0.020 - 0.030 0.020 - 0.030 0.012 - 0.020
Lead (Pb) 0.005 Max 0.005 Max 0.005 Max
Tin (Sn) 0.002 Max 0.002 Max 0.002 Max
Cadmium (Cd) 0.005 Max 0.005 Max 0.005 Max
Iron (Fe) 0.035 Max 0.05 Max 0.07 Max
Zinc (Zn) Balance Balance Balance

Mechanical Properties
Alloy Property   #3 #2 #5 #7 ZA-8 ZA-12 ZA-27
Ultimate Tensile Strength psi x 103
(Mpa)
41
(283)
52
(359)
48
(331)
41
(283)
54
(372)
59
(404)
62
(426)
Yield Strendth 0.2% Offset psi x 103
(Mpa)
32
(221)
NA
33
(228)
NA
42
(290)
46
(320)
54
(371)
Elongation (% in 2") 10 7 7 13 8 5 2.5
Shear Strength psi x 103
(Mpa)
31
(214)
46
(317)
38
(262)
31
(214)
40
(275)
43
(296)
47
(325)
Hardness (Brinell) 82 100 91 80 103 100 119
Impact Strength ft-lb
(J)
432
(58)
352
(47)
482
(65)
432
(58)
312
(42)
212
(29)
92
(13)
Fatigue Strength Rotory Bend (% x 108 cycles) psi x 103
(Mpa)
6.9
(47.6)
8.5
(58.6)
8.2
(56.5)
6.8
(46.9)
15
(103)
17
(117)
21
(145)
Compressice Yield Strength 0.1% Offset psi x 103
(Mpa)
606
(414)
936
(641)
876
(600)
606
(414)
37
(252)
39
(269)
52
(359)

Physical Properties
Alloy Property   #3 #2 #5 #7 ZA-8 ZA-12 ZA-27
Density lb/in3
(Kg/m3)
0.24
(6600)
0.24
(6600)
0.24
(6700)
0.24
(6600)
0.227
(6300)
0.218
(6030)
0.181
(5000)
Melting Range Fo
Co
718 - 728
381 - 387
715 - 734
379 - 390
717 - 727
380 - 386
718 - 728
381 - 387
707 - 759
375 - 404
710 - 810
377 - 432
708 - 903
376 - 484
Electrical Conductivity % IACS 27 25 26 27 27.7 28.3 29.7
Thermal Conductivity Btu/ft-hr Fo
(W/m K)
65.3
(113)
60.5
(105)
62.9
(109)
65.3
(113)
66.3
(115)
67.1
(116)
72.5
(126)
Pattern Shrinkage in/in or m/m 0.006 0.006 0.006 0.006 0.007 0.0075 0.008
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