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Sulfur monochloride

May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)

CAS number: 10025–67–9

NIOSH REL: 1 ppm (6 mg/m3) CEILING

Current OSHA PEL: 1 ppm (6 mg/m3) TWA

1989 OSHA PEL: 1 ppm (6 mg/m3) CEILING

1993-1994 ACGIH TLV: 1 ppm (5.5 mg/m3) CEILING

Description of substance: Light-amber to yellow-red, oily liquid with a pungent, nauseating, irritating odor.

LEL: . . Unknown

Original (SCP) IDLH: 10 ppm

Basis for original (SCP) IDLH: Very little data are available on which to base the IDLH for sulfur monochloride. The chosen IDLH has been estimated from the statement by ACGIH [1971] that 12 ppm for 15 minutes was tolerated by cats, but four times that concentration, also for 15 minutes, could lead to death after a few days [Flury and Zernik 1931]. No other useful data are available on which to base the IDLH.

Short-term exposure guidelines: None developed


Lethal concentration data:

Species Reference LC50




Time Adjusted 0.5-hr


Derived value
Mouse Flury & Zernik 1931 ----- 150 1 min 48 ppm (0.32) 4.8 ppm
Cat Henderson & Haggard 1943 LC100: 60 ----- 15 min 47 ppm (0.79) 4.7 ppm

Other animal data: It has been reported that cats have tolerated 15-minute exposures to 12 ppm, while 48 ppm could lead to death after a few days [Flury and Zernik 1931].

Human data: None relevant for use in determining the revised IDLH.

Revised IDLH: 5 ppm

Basis for revised IDLH: The revised IDLH for sulfur monochloride is 5 ppm based on acute inhalation toxicity data in animals [Flury and Zernik 1931; Henderson and Haggard 1943].


1. ACGIH [1971]. Sulfur monochloride. In: Documentation of the threshold limit values for substances in workroom air. 3rd ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, pp. 240-241.

2. Flury F, Zernik F [1931]. Schädliche gase dämpfe, nebel, rauch- und staubarten. Berlin, Germany: Verlag von Julius Springer, pp. 146-147 (in German).

3. Henderson Y, Haggard HW [1943]. Noxious gases. 2nd ed. New York, NY: Reinhold Publishing Corporation, p. 130.