ABC of Safety in the Biological Sciences
Face masks are used to protect the wearer against inhalation of fumes, vapours, gases and dust particles (see also Respirators). In most laboratory situations it is not necessary to wear a respirator but it frequently makes sense to wear a lightweight, absorbent mask made from charcoal cloth or similar absorbent material.79 These are effective against dust and a wide range of fumes, gases and vapours and are inexpensive.
Use a mask when:
Where a splash or dust hazard exists use a full face shield.