# Zinc-Lead-Cadmium Rolled Zinc Alloy (Z21721)

Z21721 zinc is an otherwise-unclassified alloy of zinc. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a moderately low heat capacity and a moderately low tensile strength among zinc alloys. The graph bars on the material properties cards below compare Z21721 zinc to other zinc alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

## Mechanical Properties

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

40 *%*

Poisson's Ratio

0.25

Shear Modulus

35 *GPa* 5.0 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

150 *MPa* 22 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

120 *MPa* 18 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

110 *J/g*

Maximum Temperature: Mechanical

90 *°C* 190 *°F*

Melting Completion (Liquidus)

410 *°C* 770 *°F*

Melting Onset (Solidus)

390 *°C* 740 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.093 *BTU/lb-°F*

Thermal Conductivity

110 *W/m-K* 65 *BTU/h-ft-°F*

Thermal Expansion

26 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

27 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

37 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

11 *% relative*

Density

6.6 *g/cm ^{3}* 410

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

53 *MJ/kg* 23 *x 10 ^{3} BTU/lb*

Embodied Water

340 *L/kg* 41 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

57 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

88 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.3 *points*

Stiffness to Weight: Bending

22 *points*

Strength to Weight: Axial

6.4 *points*

Strength to Weight: Bending

9.6 *points*

Thermal Diffusivity

44 *mm ^{2}/s*

Thermal Shock Resistance

4.8 *points*

## Alloy Composition

Zn | 98.9 to 100 | |

Pb | 0 to 1.0 | |

Cd | 0 to 0.070 | |

Ti | 0 to 0.020 | |

Fe | 0 to 0.010 | |

Cu | 0 to 0.0050 | |

Al | 0 to 0.0020 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ASTM B69: Standard Specification for Rolled Zinc

Corrosion Resistance of Zinc and Zinc Alloys, Frank C. Porter, 1994

Zinc Handbook: Properties, Processing, and Use In Design, Frank C. Porter, 1991

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015