Better Casting Material
ZA-12 Alloy Outperforms Traditional Materials
Graphicast ZA-12 zinc alloy castings offer an excellent combination of mechanical properties, surface finish, and low cost. ZA-12’s strength, hardness, and wear properties are better than any other general-purpose nonferrous casting alloy. Because ZA-12 is spark proof, it can be used in hazardous environments, including those underground.
With excellent castability, ZA-12 has a distinctive lustrous appearance, and its low casting temperature promotes long mold life. Zinc metal and alloys are also readily available at relatively stable prices, ensuring the long-term viability of products designed with Graphicast components.
ZA-12 vs. Cast Iron
ZA-12 has approximately the same density as cast iron, but is stronger. It machines three times faster with greatly improved tool life. It also offers much better corrosion resistance.
ZA-12 vs. Aluminum
ZA-12 is harder, stronger, and has better wearing qualities than aluminum, yet it does not require heat treating. ZA-12 machines more easily than aluminum, is more dimensionally stable, and will not warp.
ZA-12 vs. Brass/Bronze
ZA-12 machines as easily as either brass or bronze, yet has superior strength, hardness, and wearing qualities. It can also be coated for corrosive applications/environments.
ZA-12 Physical Properties vs. Other Casting Materials
|Materials||ZA-12||Other Casting Materials|
|Properties||Zn/11 Al/.75 Cu||Aluminum 356-T6||Bronze 85-5-5-5||Class 30 Iron|
|Graphicast Process||Sand Cast||Permanent Mold||Sand Cast|
|Tensile Strength (psi x 103)||50||33||38||37||34|
|Yield Strength (0.2% offset, psi x 103)||31||24||27||17||–|
|% Elongation (in 2 inches)||2-3||3.5||5||30||–|
|Brinell Hardness (500 kg load)||110-125||70||80||65||180-225|
|Young’s Modulus (psi x 106)||12||10.5||10.5||13.5||13 to 16|
|Fatigue Strength (psi x 103 @ 5 x 108 cycles)||15||8.5||13||11||14|
|Thermal Expansion (µinch/inch/°F @ 68°-212°F)||13.4||11.9||11.9||10.1||6|
|Thermal Conductivity (BTU/ft/hr/ft2/°F @ 68°F)||67||87||92||40||26|
|Electrical Conductivity (% Cu)||28||39||41||15||–|
NOTE: Figures are correct, but are not warranted in any way by Graphicast, Inc.
For structural applications above 200°F, or for detailed fatigue, impact, or
creep strength properties, contact Graphicast.