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Based on the available data on its physical and chemical properties, tangled multi-walled carbon nanotubes (TMWCNTs) are reported to be an inorganic solid (powder of carbon nanotubes, presented as agglomerate grains) with an agglomerate density of 0.041 -0.153 g/cm3 and a true density of 2.1 - 2.3 g/cm3 at 20°C. It is considered as not soluble in water.

TMWCNTs have a specific surface area of 180 - 283 m2/g.

The substance is made of tightly bound agglomerates constituted with entangled multi-walls carbon nanotubes. These agglomerates can be spherical, ovoid or with an irregular shape.

The particle size distribution of these agglomerates indicates a median diameter (D50) of 70 - 790 µm. The tubes within the TMWCNTs agglomerates can be described as thin, short and tangled. Specifically, they display an outer tube diameter of 4 - 30 nm.

Besides, TMWCNTs have been shown to be non flammable and to not flame spontaneously up to 400°C. Based on its chemical structure, TMWCNTs are not expected to be explosive nor to have oxidising properties.