Nanomaterial hazard analysis
For carpet growth, carbon containing gases are introduced to a CVD reactor, where the CNT grow as a solid material bound on a silicon wafer. The CNT are typically 30 to 300 micrometers long. The material is usually separated from the silicon wafer as an intact, solid film, and has the appearance of a piece of black tape.
Nanomaterial exposure assessment
There is risk of contact of solid CNT film with the skin.
Nanomaterial exposure analysis
Skin contact does not appear to be a route for uptake into the body, and standard laboratory hygiene practices should be adequate here. Use gloves when handling the film. Good chemical hygiene as spelled out in the Rice University Chemistry Department’s Chemical Hygiene Manual will be maintained.
If the film is accidentally crushed, this should be promptly be cleaned up by HEPA vacuum or wet wipe, as appropriate. New students and staff will be trained by experienced staff in the specific procedures of the HiPco laboratory after they receive general training from the University EHS. University Facilities, Engineering and Planning will routinely inspect fume hoods, and certify proper operation. Use of conventional vacuum cleaners is prohibited as this may re-suspend CNT particles. Waste material is labeled for content, and is removed by the University chemical waste disposal service.
Hazard class B, solid material, short term exposure, control band 1 New information from the literature as to hazards of CNT will be discussed to determine if procedures need to be modified to reduce risk of exposure. Such changes will be incorporated into the protocol and training.
The University EHS and/or the Chemistry Department maintains records on employee training and overall safety procedures.