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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Call Us: (626) 333-2237

Technical Assistance:

Semco has an extensive tehnical library to assist customers in solving technical problems in all facets of business... LEARN MORE

Price Risk Managment:

Semco realizes that to protect from price volatility, they need to protect their customers' risk exposure. This is why Semco uses real time pricing... LEARN MORE


Semco will take the zinc die cast parks and dross in an ingot form, remelt the material and cast it back into an ignot with proper chemical specifications... LEARN MORE

Mold Base Alloys

Semco manufactures Kirksite Alloy. The alloy has moderate strength and good abrasion resistance due to it's self-lubricating properties, but limited life. Kirksite is for gravity casting of tools and tool applications, plastic injection and molding inserts.

Chemical Specification (per ASTM B240-07)
Aluminum (Al) 3.9 - 4.3
Copper (Cu) 2.67- 3.3
Magnesium (Mg) 0.025 - 0.050
Lead (Pb) 0.004 Max
Tin (Sn) 0.0015 Max
Cadmium (Cd) 0.003 Max
Iron (Fe) 0.035 Max
Zinc (Zn) Balance

Mechanical Properties
Alloy Property   Kirksite
Ultimate Tensile Strength psi x 103
Yield Strendth 0.2% Offset psi x 103
Elongation (% in 2") 7
Shear Strength psi x 103
Hardness (Brinell) 100
Impact Strength ft-lb
Fatigue Strength Rotory Bend (% x 108 cycles) psi x 103
Compressice Yield Strength 0.1% Offset psi x 103

Physical Properties
Alloy Property   Kirksite
Density lb/in3
Melting Range Fo
715 - 734
379 - 390
Electrical Conductivity % IACS 25
Thermal Conductivity Btu/ft-hr Fo
(W/m K)
Pattern Shrinkage in/in or m/m 0.006
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