Most often, though casting design procedures, and alloy ZAMAK- 3 pressure die casting can be made to meet service or functional requirements. When this is not the case, especially where strength is concerned, ZAMAK- 5 is the logical choice. Except for a nominal 1% copper addition, the chemistry of ZAMAK- 5 is comparable to that of ZAMAK- 3. This composition modification results in higher tensile strength and increased hardness, with a sacrifice in elongation. ZAMAK- 5 also has significantly better creep resistance than the other alloys in the conventional group.

Zamak-5 is not as ductile as some of other alloys, a factor to consider when post casting operations are required, Because of the copper content, trim scrap should be segregated.


Alloying Elements (%)
Al 3.9 – 4.3
Cu 0.75 – 1.25
Mg 0.04 – 0.06
Impurities Fe 0.100 M
Cd 0.002 M
Sn 0.002 M
Pb 0.003 M


Brinel Hardness 91
Compressive Strength (psi) 87000
Tensile Strength (psi) 48000
Melting Points 0C 405
Density kg.m3 6700