What is the density of woven carbon fibre composite?

1,550 kg/m³ (1,500–1,600), or 1.55 g/cm³.

Does woven carbon fibre composite float?

No. At 1,550 kg/m³ it is denser than water.

Woven carbon fibre composite

Density of woven carbon fibre composite

1,550 kg/m³ (1,500–1,600)

1.55 g/cm³ · 96.8 lb/ft³

The familiar chequerboard weave, and it is roughly a third as strong as unidirectional laminate of the same weight because half the fibres run the wrong way for any given load and every fibre is kinked where it crosses another. It is chosen for drape and for looks: a woven cloth conforms to a curved mould where unidirectional tape will not. Most visible "carbon fibre" on cars is a single cosmetic weave ply over glass fibre or plastic, contributing nothing structural.

Properties

Density: 1,550 kg/m³ (1,500–1,600) — 1.55 g/cm³
Tensile strength: 600–900 MPa
Young's modulus: 60 GPa
Floats in water: No
Magnetic: No

What it is used for

Car body panels and interior trim
Drone and camera gimbal frames
Sports equipment shells
Cosmetic and visible-weave parts

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

woven carbon fibre composite 1,550 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×
woven carbon fibre composite ←	1,550 kg/m³	1.55×
platinum	21,450 kg/m³	21.45×
gold	19,300 kg/m³	19.30×
tungsten	19,250 kg/m³	19.25×

Does it rust?

Woven carbon fibre composite contains no iron, so it cannot rust. Whether it degrades depends on the material, not on oxidation.

Is it magnetic?

Woven carbon fibre composite is not a metal and has no ferromagnetic response.

Common questions

What is the density of woven carbon fibre composite?: 1,550 kg/m³ (1,500–1,600), or 1.55 g/cm³.
Does woven carbon fibre composite float?: No. At 1,550 kg/m³ it is denser than water.
Is woven carbon fibre composite magnetic?: Woven carbon fibre composite is not a metal and has no ferromagnetic response.

Does woven carbon fibre composite float? No
Unidirectional carbon fibre composite 1,600 kg/m³
Fibreglass (GRP) 1,900 kg/m³
Asphalt (hot-mix) 2,350 kg/m³

Sources

Typical range compiled from manufacturer specifications — At One Place

How these figures are compiled and checked