Flammability & Exposure Limits
| Compound | Formula | LFL (vol % in air) [1] | UFL (vol % in air) [1] | NIOSH LEL (vol %) [2] | NIOSH UEL (vol %) [2] | Flash point (°F) [2] | NIOSH REL (ppm, 10-h TWA) [2] | NIOSH REL ST (ppm) [2] | NIOSH REL C (ppm) [2] | OSHA PEL (ppm, 8-h TWA) [3] | IDLH [2] |
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Flammability limits are near 25 °C and 1 atm in air [1]. NIOSH LEL/UEL are at room temperature unless a temperature follows, flash points closed cup, ST a 15-minute limit and C a ceiling (a bracket gives another period), as printed in the 2005-149 Pocket Guide [2]; NIOSH lists xylene isomers separately and has no entry for hydrogen, methane, ethane, ethylene or propylene. PELs are from Table Z-1 except where marked Z-2 [3]; “—” means this site has no value. For a mixture use the Flammability Limits of a Mixture calculator.