Ketene

CAS variety: 463–fifty one–4
NIOSH REL: zero.5 ppm (zero.9 mg/m3) TWA, one.5 ppm (three mg/m3) STEL
Current OSHA PEL: 0.five ppm (zero.9 mg/m3) TWA
1989 OSHA PEL: zero.5 ppm (zero.9 mg/m3) TWA, 1.five ppm (3 mg/m3) STEL
1993-1994 ACGIH TLV: zero.5 ppm (zero.86 mg/m3) TWA, one.five ppm (2.half-dozen mg/m3) STEL
Description of substance: Colorless gas with a penetrating odor.
LEL: . . Unknown
Original (SCP) IDLH*: Unknown [*Note: “Effective” IDLH = 25 ppm — see discussion below.]
Basis for original (SCP) IDLH: No information on acute inhalation toxicity are on the market on which to base an IDLH for ketene. For this draft technical normal, thus, the respirators have been selected on the idea of the assigned protection factor afforded by each device up to fifty ´ the OSHA PEL of 0.five ppm (i.e., twenty five ppm); only the “most protective” respirators are permitted to be used in concentrations exceeding twenty five ppm.
Short-term exposure tips: None developed