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Methyl acetylene																				Related Pages
										May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
**CAS number:** 74–99–7
**NIOSH REL:** 1,000 ppm (1,650 mg/m3) TWA
**Current OSHA PEL:** 1,000 ppm (1,650 mg/m3) TWA
**1989 OSHA PEL:** Same as current PEL
**1993-1994 ACGIH TLV:** 1,000 ppm (1,640 mg/m3) TWA
**Description of substance:** Colorless gas with a sweet odor.
**LEL** :. . 1.7% (10% LEL, 1,700 ppm)
**Original (SCP) IDLH:** 15,000 ppm [LEL]
**Basis for original (SCP) IDLH:** The chosen IDLH is based on the lower explosive limit (LEL) of 17,000 ppm rounded down to 15,000 ppm.
**Short-term exposure guidelines:** None developed
**ACUTE TOXICITY DATA:**
**Animal data:** None relevant for use in determining the revised IDLH.
**Human data:** It has been stated that methyl acetylene appears to be a general anesthetic with comparatively low toxicity [ACGIH 1991].

**Revised IDLH:** 1,700 ppm [LEL] **Basis for revised IDLH:** Since methyl acetylene appears to have relatively low toxicity [ACGIH 1991], the revised IDLH is 1,700 ppm based strictly on safety considerations (i.e., being 10% of the lower explosive limit of 1.7%).**REFERENCE:**
1. ACGIH [1991]. Methyl acetylene. In: Documentation of the threshold limit values and biological exposure indices. 6th ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, p. 929.

			
							
								Page last reviewed:  December 4, 2014						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Publications & Products
Immediately Dangerous To Life or Health (IDLH) Values
Table of IDLH Values
Criteria for Determining IDLH Values
Historical Documentation
Original (SCP) Values
Abbreviations for IDLH Documentation
Abbreviations for Journal Titles Follow NIOSH Facebook
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