---
title: "Aluminum 7075 — density, melting point and properties"
description: "Aluminum 7075 has a density of 2,810 kg/m³. Melting point, strength, conductivity, what it is used for, and whether it floats, rusts or is magnetic."
url: https://atoneplace.net/material/aluminum-7075/
site: "At One Place"
---

# Aluminum 7075

**Density of aluminum 7075: 2,810 kg/m³**

2.81 g/cm³ · 175.4 lb/ft³

Zinc-alloyed and, at 570 MPa in T6, as strong as many steels while weighing a third as much — this is the alloy that made all-metal aircraft practical. The price is that it cannot be fusion welded without cracking, it is more prone to stress-corrosion cracking than 6061, and it costs several times as much. Choose it only when the part is bolted or riveted and the strength is genuinely needed; otherwise 6061 is the better engineering answer.

## Properties

- **Density:** 2,810 kg/m³ — 2.81 g/cm³
- **Melting range:** 477–635 °C
- **Tensile strength:** 220–570 MPa
- **Young's modulus:** 71.7 GPa
- **Thermal conductivity:** 130 W/(m·K)
- **Thermal expansion:** 23.6 µm/(m·K)
- **Floats in water:** No
- **Magnetic:** No

## What it is used for

- Aircraft wing spars and fuselage frames
- Competition bicycle and motorsport parts
- Rifle receivers and rock climbing hardware
- High-load machined fixtures

## How it compares

*Water is 1,000 kg/m³. Anything with a shorter bar than water floats in it.*

- air: 1.2 kg/m³
- expanded polystyrene foam: 20 kg/m³
- rigid polyurethane foam: 40 kg/m³
- Water — the float line: 1,000 kg/m³
- aluminum 7075: 2,810 kg/m³
- tungsten: 19,250 kg/m³
- gold: 19,300 kg/m³
- platinum: 21,450 kg/m³

*Water is 1,000 kg/m³. Anything below that floats.*

| Material | Density | Relative to water |
| --- | --- | --- |
| rigid polyurethane foam | 40 kg/m³ | 0.04× |
| expanded polystyrene foam | 20 kg/m³ | 0.02× |
| air | 1.2 kg/m³ | 0.00× |
| aluminum 7075 ← | 2,810 kg/m³ | 2.81× |
| platinum | 21,450 kg/m³ | 21.45× |
| gold | 19,300 kg/m³ | 19.30× |
| tungsten | 19,250 kg/m³ | 19.25× |

## Does it rust?

No — aluminium cannot rust, because rust is specifically iron oxide and there is no iron in it. It does oxidise, immediately and constantly, but aluminium oxide is hard, tightly bonded and only a few nanometres thick, and it protects the metal beneath rather than flaking away. It does corrode galvanically when in contact with a dissimilar metal in a damp environment, which is a different mechanism.

## Is it magnetic?

Aluminum 7075 is not ferromagnetic. It is often assumed to be because it is a metal, but most metals are not — only iron, nickel, cobalt and a few alloys are attracted to an ordinary magnet.

## Common questions

### What is the density of aluminum 7075?

2,810 kg/m³, or 2.81 g/cm³.

### Does aluminum 7075 float?

No. At 2,810 kg/m³ it is denser than water.

### Is aluminum 7075 magnetic?

Aluminum 7075 is not ferromagnetic. It is often assumed to be because it is a metal, but most metals are not — only iron, nickel, cobalt and a few alloys are attracted to an ordinary magnet.

## Related pages

- [Does aluminum 7075 float?](https://atoneplace.net/does-it-float/aluminum-7075/)
- [Mild steel](https://atoneplace.net/material/mild-steel/)
- [Stainless steel 304](https://atoneplace.net/material/stainless-304/)
- [Brass](https://atoneplace.net/material/brass/)
- [Gray cast iron](https://atoneplace.net/material/cast-iron/)
- [High-carbon steel](https://atoneplace.net/material/carbon-steel/)
- [Stainless steel 316](https://atoneplace.net/material/stainless-316/)
- [Aluminum 6061](https://atoneplace.net/material/aluminum-6061/)
- [Bronze](https://atoneplace.net/material/bronze/)

## Sources

- Typical range compiled from manufacturer specifications — At One Place (/about/)