Carbon nanotubes

Synonyms

SWCNT (single-wall carbon nanotubes); MWCNT (multi-wall carbon nanotubes);

Category

Fibrogenic Dusts

Description

“. . . nanotubes composed of carbon. CNT usually consist of curved graphene layers, including single-wall CNT and multiwall CNT." [IARC Monograph 111]

Sources/Uses

Carbon nanotube (CNT) applications include electronics, reinforced rods, polymer activators, biosensors, and electron microscopy; [PMID 21191487] "CNTs are several times stronger than steel at the same weight; and they provide excellent thermal and electrical conductivity. CNTs are used in composites, aerospace, electronics, and energy applications." [PMID 21654426]

Comments

Carbon nanotubes of sufficient length and aspect ratio can induce asbestos-like responses in mice. [Reference #2] "There is sufficient evidence in experimental animals for the carcinogenicity of MWCNT-7 multiwalled carbon nanotubes. . . . MWCNT-7 multiwalled carbon nanotubes are possibly carcinogenic to humans (Group 2B). Multiwalled carbon nanotubes other than MWCNT-7 are not classifiable as to their carcinogenicity to humans (Group 3). Single-walled carbon nanotubes are not classifiable as to their carcinogenicity to humans (Group 3)." [IARC Monograph 111]

Reference Link #1

Biomedical References

Reference Link #2

Yes

Possible (2b)

Processes

Industrial Processes with risk of exposure:

• Plastic Composites Manufacturing