# Spring-Tempered (H08) C12900 Copper

H08 C12900 copper is C12900 copper in the H08 (spring) temper. It has the highest strength and lowest ductility compared to the other variants of C12900 copper. The graph bars on the material properties cards below compare H08 C12900 copper to: wrought coppers (top), all copper alloys (middle), 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

120 *GPa* 17 *x 10 ^{6} psi*

Elongation at Break

2.8 *%*

Poisson's Ratio

0.34

Rockwell B Hardness

60

Rockwell F Hardness

94

Rockwell Superficial 30T Hardness

63

Shear Modulus

43 *GPa* 6.3 *x 10 ^{6} psi*

Shear Strength

210 *MPa* 31 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

420 *MPa* 61 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

370 *MPa* 53 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

210 *J/g*

Maximum Temperature: Mechanical

200 *°C* 390 *°F*

Melting Completion (Liquidus)

1080 *°C* 1980 *°F*

Melting Onset (Solidus)

1030 *°C* 1880 *°F*

Specific Heat Capacity

390 *J/kg-K* 0.092 *BTU/lb-°F*

Thermal Conductivity

380 *W/m-K* 220 *BTU/h-ft-°F*

Thermal Expansion

17 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

98 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

98 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

32 *% relative*

Density

9.0 *g/cm ^{3}* 560

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

41 *MJ/kg* 18 *x 10 ^{3} BTU/lb*

Embodied Water

330 *L/kg* 39 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

11 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

580 *kJ/m ^{3}*

Stiffness to Weight: Axial

7.2 *points*

Stiffness to Weight: Bending

18 *points*

Strength to Weight: Axial

13 *points*

Strength to Weight: Bending

14 *points*

Thermal Diffusivity

110 *mm ^{2}/s*

Thermal Shock Resistance

15 *points*

## Alloy Composition

Cu | 99.88 to 100 | |

Ag | 0 to 0.054 | |

Ni | 0 to 0.050 | |

Te | 0 to 0.025 | |

As | 0 to 0.012 | |

Pb | 0 to 0.0040 | |

Bi | 0 to 0.0030 | |

Sb | 0 to 0.0030 |

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

## Followup Questions

## Further Reading

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