CAS range: 591–78–half dozen
NIOSH REL: one ppm (4 mg/m3) TWA
Current OSHA PEL: one hundred ppm (410 mg/m3) TWA
1989 OSHA PEL: 5 ppm (20 mg/m3) TWA
1993-1994 ACGIH TLV: five ppm (20 mg/m3) TWA
Description of Substance: Colorless liquid with an acetone-like odor.
LEL:. . Unknown
Original (SCP) IDLH: five,000 ppm
Basis for original (SCP) IDLH: The chosen IDLH is predicated on the statements by AIHA [1968] that guinea pigs exposed to 6,000 ppm showed signs of starting narcosis at 30 minutes and deep anesthesia at the tip of 1 hour; death failed to occur for six.five hours at this concentration [Specht et al. 1940]. Also, AIHA [1968] reported that 8,00zero ppm killed all rats during a four-hour exposure [Smyth et al. 1954]. [Note: For “convenience”, an IDLH of 5,00zero ppm (50 ? the OSHA PEL) was originally chosen rather than half dozen,00zero ppm.]