Zamak 2 Ingot (Aluminum 4%, Copper 3%, Zinc 93%) - Kirksite

Sold by the Ingot

Zamak 2 comes in an ingot that weighs approximately 4lbs (3.9lbs - 4.1lbs) and measures 1" x 2" x 8.5" with tapered sides. This alloy has the same composition as Zamak 3 with the addition of 3% copper in order to increase strength by 20%, which also increases the price. Zamak 2 has the greatest strength out of all the Zamak alloys. Over time it retains its strength and hardness better than the other alloys; however, it becomes more brittle, shrinks, and less elastic.

Commonly used in rubber mold casting.  Easy to cast and able to be drawn out into a thin wire.

Within the Zamak family of zinc die casting alloys, Zamak 2 has the highest strength and hardness due to its higher copper content (3%).  Zamak 2 is also known as Kirksite when making tooling for the stamping or plastic injection mold industries. 

Melts about 785F

Physical Properties (if doing sand casting)

Brinell Hardness Number - 100

Melting Point - 717 degrees F

Specific Gravity - 6.7

Weight per Cubic Inch - .25 lbs

Weight per Cubic Foot - 432 lbs

Electrical Conductivity - 24.9% of Cu

Chemical Composition

Copper - 2.6-2.9

Aluminum - 3.9-4.3

Magnesium - 0.025-0.05

Cadmium - 0.003 MAX

Iron - 0.075 MAX

Lead - 0.003 MAX

Tin - 0.001 MAX

Zinc - balance

Meets Spec MIL-Z-7068 Class I & II, MIL-R-4208, MIL-Z-16460A, ASTM B240 Alloy AC43A