Zamak 2 has the highest strength and hardness of all the 4 percent aluminium zinc die-casting alloys and it is used when these properties are critical. The relatively high Cu contents makes it about 25 percent stronger than Zamak 5. After ageing it retains strength better than most zinc alloys and becomes more dimensionally stable but it has reduced impact strength and hardness. Because of the copper content, trim scrap should be segregated.
Chemistry
| Alloying Elements (%) | |||
| Al | – | 3.9 – 4.3 | |
| Mg | – | 0.04 – 0.08 | |
| Cu | – | 2.5 – 3.5 | |
| Impurities | Fe | – | 0.075 Max |
| Cd | – | 0.002 Max | |
| Sn | – | 0.002 Max | |
| Pb | – | 0.003 Max | |
Physics
| Brinel Hardness | – | 100 |
|
Compressive Strength (kg/mm2) |
– | 65.4 |
| Melting Points 0C | – | 390 |
| Density kg.m3 | – | 6 |