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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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ln testing sensory response of exposure to various organic vapors, Silverman and co-workers (1946) found that a majority of individuals experienced eye irritation after 3 to 5 minutes of exposure at 25 ppm mesityl oxide with the addition of nasal irritation at 50 ppm. On the basis of an unpleasant taste that persisted in some cases for 3 to 6 hours after exposure and the nasal irritation experienced at 50 ppm, these workers suggested 25 ppm as the highest concentration which would be satisfactory for an 8-hour day.