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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Gravity Base Alloys


Semco manufacturers the ZA alloys; ZA8, ZA12, ZA27; each have varying ranges for Aluminum, Copper, Magnesium and Nickel. The ZA alloys are primarily used for gravity casting in sand and permanent molds or they can be pressure die cast on cold chamber machines. The exception, ZA8, because of it's low melting temperature can be hot chamber cast. ZA alloys have replaced many iron and bronze applications due to the ZA alloys' high fluidity, strength, hardness, purity and underside shrinkage. ZA alloys are used for tooling and decorative plating.

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   ZA-8 ZA-12 ZA-27
Ultimate Tensile Strength psi x 103
(Mpa)
54
(374)
59
(404)
62
(426)
Yield Strendth 0.2% Offset psi x 103
(Mpa)
42
(290)
46
(320)
54
(371)
Elongation (% in 2") 8 5 2.5
Shear Strength psi x 103
(Mpa)
40
(275)
43
(296)
47
(325)
Hardness (Brinell) 103 100 119
Impact Strength ft-lb
(J)
312
(42)
212
(29)
92
(13)
Fatigue Strength Rotory Bend (% x 108 cycles) psi x 103
(Mpa)
15
(103)
17
(117)
21
(145)
Compressice Yield Strength 0.1% Offset psi x 103
(Mpa)
37
(252)
39
(269)
52
(359)

Physical Properties
Alloy Property   ZA-8 ZA-12 ZA-27
Density lb/in3
(Kg/m3)
0.227
(6300)
0.218
(6030)
0.181
(5000)
Melting Range Fo
Co
707 - 759
375 - 404
710 - 810
377 - 432
708 - 903
376 - 484
Electrical Conductivity % IACS 27.7 28.3 29.7
Thermal Conductivity Btu/ft-hr Fo
(W/m K)
66.3
(115)
67.1
(116)
67.5
(126)
Pattern Shrinkage in/in or m/m 0.007 0.0075 0.008
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