# Zamak 2 (ASTM AC43A, Z35541, Mazak 2) Zinc Alloy

Zamak 2 is a zinc-aluminum alloy. It is typically furnished in the as-fabricated (no temper or treatment) condition. AC43A is the ASTM designation for this material. Z35541 is the UNS number. And Zamak 2 is the common industry name. It has the lowest electrical conductivity and a moderately high tensile strength relative to other zinc alloys. The graph bars on the material properties cards below compare Zamak 2 to: zinc-aluminums (top), all zinc alloys (middle), and the entire database (bottom).

## Mechanical Properties

Brinell Hardness

100

Compressive (Crushing) Strength

640 *MPa* 93 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

87 *GPa* 13 *x 10 ^{6} psi*

Elongation at Break

6.0 *%*

Fatigue Strength

59 *MPa* 8.6 *x 10 ^{3} psi*

Knoop Hardness

130

Poisson's Ratio

0.26

Rockwell B Hardness

63

Shear Modulus

33 *GPa* 4.8 *x 10 ^{6} psi*

Shear Strength

320 *MPa* 46 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

360 *MPa* 52 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

270 *MPa* 39 *x 10 ^{3} psi*

## Thermal Properties

Melting Completion (Liquidus)

390 *°C* 730 *°F*

Melting Onset (Solidus)

380 *°C* 710 *°F*

Solidification (Pattern Maker's) Shrinkage

1.3 *%*

Specific Heat Capacity

410 *J/kg-K* 0.1 *BTU/lb-°F*

Thermal Conductivity

110 *W/m-K* 63 *BTU/h-ft-°F*

Thermal Expansion

28 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

25 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

35 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

12 *% relative*

Density

6.5 *g/cm ^{3}* 400

*lb/ft*

^{3}Embodied Carbon

3.0 *kg CO _{2}/kg material*

Embodied Energy

57 *MJ/kg* 24 *x 10 ^{3} BTU/lb*

Embodied Water

380 *L/kg* 45 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

20 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

420 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.5 *points*

Stiffness to Weight: Bending

23 *points*

Strength to Weight: Axial

15 *points*

Strength to Weight: Bending

17 *points*

Thermal Diffusivity

41 *m ^{2}/s*

Thermal Shock Resistance

11 *points*

## Alloy Composition

Zn | 92.2 to 94 | |

Al | 3.5 to 4.3 | |

Cu | 2.5 to 3.3 | |

Fe | 0 to 0.1 | |

Mg | 0.020 to 0.060 | |

Si | 0 to 0.030 | |

Ni | 0 to 0.020 | |

Pb | 0 to 0.0050 | |

Cd | 0 to 0.0050 | |

Sn | 0 to 0.0030 |

All values are % weight. Ranges represent what is permitted under applicable standards.

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B86: Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings

EN 12844: Zinc and zinc alloys - Castings - Specifications

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993