CNTs show similarities to asbestos fibres
Carbon Nanotubes or CNTs are forms of carbon, which are manufactured through several molecular scale processes. They are categorized as Single-walled Carbon Nanotubes and Multi-walled Carbon Nanotubes depending on their molecular configuration. They can be pure forms of carbon or may contain metals or other materials, and are of great commercial value due to their physical and chemical characteristics. For example, it has been found that they can be sixty times stronger than steel and at the same time six times lighter. However new research linking CNTs to asbestos have raised alarm bells in the HSE.
In a recent HSE advisory on the Risk Management of Carbon Nanotubes, the agency has asked for sufficient precautionary measures to be taken for the use of these substances. HSE action has been prompted by some instances where these substances have shown potentially toxic effects. According to findings published on these carbon molecules in Nature Nanotechnology, some of the CNTs have been found to be similar in shape to asbestos fibres, while some, like asbestos, have a tendency to settle in the lungs of animals when tested in laboratories.
The HSE has said that the research raises a concern regarding these molecules but does not yet prove them to be as dangerous as asbestos. Although the research has been done only on a few types of CNTs, the HSE has decided that caution should be exercised in the use of any form of CNTs. There is a chance that these substances will be hazardous when inhaled and therefore the HSE has said that their use must be avoided or minimised. Moreover, the HSE has advised that these materials should be labelled appropriately showing that more testing is needed to establish whether they are safe to use.
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