A sensitizer is a substance that can cause exposed people to develop an allergic reaction in normal tissue after repeated exposure to the substance. Examples of compounds that may cause sensitization in some individuals are diazomethane, various isocyanates, formaldehyde, and benzylic and allylic halides.
Use a properly functioning chemical fume hood (CFH) when handling sensitizers that can be inhaled (via mist/fume/gas/vapor). If the process does not permit the handing of such materials in a fume hood, contact the UK Department of Occupational Health and Safety (859) 257‐2924 for review of laboratory ventilation.
Handling processes should be designed to minimize the potential for splash, splatter, or other likely scenarios for accidental contact.