What is the density of graphite?

2,200 kg/m³ (1,700–2,260), or 2.20 g/cm³.

No. At 2,200 kg/m³ it is denser than water.

Graphite

Density of graphite

2,200 kg/m³ (1,700–2,260)

2.20 g/cm³ · 137.3 lb/ft³

Chemically identical to diamond and its exact opposite in behaviour: carbon in flat sheets that slide over one another, which is why it is Mohs 1.5, marks paper, and works as a dry lubricant where oil would burn off. The density spread here covers the difference between the mineral at 2090-2260 kg/m³ and manufactured graphite blocks at 1700-1900, which are porous. It does not melt at atmospheric pressure — it sublimes above 3600 °C — and it is one of the few materials that gets stronger as it gets hotter, up to about 2500 °C.

Properties

Density: 2,200 kg/m³ (1,700–2,260) — 2.20 g/cm³
Tensile strength: 20–40 MPa
Young's modulus: 10 GPa
Thermal conductivity: 120 W/(m·K)
Hardness: 1.5 Mohs
Thermal expansion: 5 µm/(m·K)
Floats in water: No
Magnetic: No

What it is used for

Pencil leads and dry lubricant
Electrodes for arc furnaces and EDM
Lithium-ion battery anodes
Crucibles and casting moulds

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

graphite 2,200 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×
graphite ←	2,200 kg/m³	2.20×
platinum	21,450 kg/m³	21.45×
gold	19,300 kg/m³	19.30×
tungsten	19,250 kg/m³	19.25×

Does it rust?

Graphite contains no iron, so it cannot rust. Whether it degrades depends on the material, not on oxidation.

Is it magnetic?

Graphite is not a metal and has no ferromagnetic response.

Common questions

What is the density of graphite?: 2,200 kg/m³ (1,700–2,260), or 2.20 g/cm³.
Does graphite float?: No. At 2,200 kg/m³ it is denser than water.
Is graphite magnetic?: Graphite is not a metal and has no ferromagnetic response.

Does graphite float? No
Concrete 2,400 kg/m³
Brick 1,900 kg/m³
Gypsum board (drywall) 700 kg/m³
Tungsten carbide 14,900 kg/m³
Reinforced concrete 2,500 kg/m³
Porcelain 2,400 kg/m³
Plaster 1,100 kg/m³
Silicon carbide 3,210 kg/m³

Sources

Typical range compiled from manufacturer specifications — At One Place

How these figures are compiled and checked