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May 1994

Documentation for Immediately Dangerous To Life or Health Concentrations (IDLHs)

Methyl Cellosolve® acetate

CAS number: 110–49–6

NIOSH REL: 0.1 ppm (0.5 mg/m3 TWA [skin]

Current OSHA PEL: 25 ppm (120 mg/m3) TWA [skin]

1989 OSHA PEL: Same as current PEL

1993-1994 ACGIH TLV: 5 ppm (24 mg/m3) TWA [skin]

Description of substance: Colorless liquid with a mild, ether-like odor.

LEL: . . 1.7% (10% LEL, 1,700 ppm)

Original (SCP) IDLH: 4,000 ppm

Basis for original (SCP) IDLH: The chosen IDLH is based on an analogy with methyl methacrylate which has an IDLH of 4,000 ppm.

Short-term exposure guidelines: None developed


Lethal concentration data:






TimeAdjusted 0.5-hr


Derived value
CatFlury & Wirth 1933 -----1,2227 hr2,933 ppm (2.4)293 ppm
RatSmyth & Carpenter 1948 -----7,0004 hr14,000 ppm (2.0)1,400 ppm

Lethal dose data:






Adjusted LDDerived value
RatSmyth & Carpenter 1948 oral3,390-----4,833 ppm483 ppm
G. pigSmyth et al. 1941 oral1,250-----1,782 ppm178 ppm

Human data: It has been stated that methyl Cellosolve® acetate is slightly less toxic than methyl Cellosolve® [Gosselin et al. 1984].


Revised IDLH: 200 ppm

Basis for revised IDLH: Based on health considerations and acute inhalation toxicity data in animals [Flury and Wirth 1933; Smyth and Carpenter 1948], a value of about 1,000 ppm would have been appropriate for methyl Cellosolve® acetate. However, the revised IDLH for methyl Cellosolve® acetate is 200 ppm based on being 2,000 times the current NIOSH REL of 0.1 ppm (2,000 is an assigned protection factor for respirators; only the most reliable respirators are recommended above 2,000 times the NIOSH REL).


1. Flury F, Wirth W [1933]. Zur toxikologie der lösungsmittel (Verschieden ester, aceton, methylalkohol). Arch Gewerbepath Gewerbehyg 5:1-90 (in German).

2. Gosselin RF, Smith RP, Hodge HC [1984]. Clinical toxicology of commercial products. 5th ed. Baltimore, MD: Williams & Wilkins Company, p. II-183.

3. Smyth HF Jr, Carpenter CP [1948]. Further experience with the range finding test in the industrial toxicology laboratory. J Ind Hyg Toxicol 30:63-68.

4. Smyth HF Jr, Seaton J, Fischer L [1941]. The single dose toxicity of some glycols and derivatives. J Ind Hyg Toxicol 23:259-268.

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