Zamak 27
ZnAl27Cu2 / ZA-27
Zamak 12 / ZnAl11Cu1 / ZA-12
Zamak 12 is the most versatile zinc alloy in terms of combining high performance properties and ease of fabrication using either gravity or pressure die casting
For these reasons, die cast Zamak 12 often competes with Zamak 27 for strength application. An excellent bearing alloy, Zamak 12 is also palatable, although plating adhesion is reduced compared to the zinc alloys
Zamak 12 is the best gravity casting alloy for sand, permanent mold and the graphite mold casting process. It is also a good (cold chamber) die casting alloy
• It holds more difficult coating
• Ideal for gravity casting
• Can use in cold chamber metal injection
Zamak 12 Chemical Analysis
| Analysis ( %) | Zamak 12 / ZnAl11Cu1 |
|---|---|
| Al | 10.8 – 11.5 |
| Cu | 0.5 – 1.2 |
| Mg | 0.02 – 0.03 |
| Pb | ≤0.005 |
| Fe | ≤0.05 |
| Cd | ≤0.005 |
| Sn | ≤0.002 |
| Si | ≤0.05 |
| Ni | ≤0.001 |
Zamak 12 General Mechanical Properties
| Mechanical Properties | Metric Value |
|---|---|
| Ultimate Tensile Strength | 400 MPa |
| Yield Strength (0.2% offset) | 317 MPa |
| Impact Strength | 29 J |
| Elongation % in 2 | 4 – 7 |
| Shear Strength | 296 MPa |
| Compressive Yield Strength | 269 MPa |
| Fatigue Strength (reverse bending 5×108cycles) | 117 MPa |
| Hardness | 95 – 115 Brinell |
Zamak 12 General Physical Properties
| Physical Properties | Metric Value |
|---|---|
| Solidification Range (melting range) | 377 – 432 C |
| Density | 6.0 kg/dm3 |
| Coefficient of Thermal Expansion | 24.2 μm/m-°C |
| Thermal Conductivity | 116.1 W/mK |
| Specific Heat Capacity | 448 J/kg-°C |
