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Methyl acetylene-propadiene mixture (MAPP)																				Related Pages
										May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
**CAS number:** 59355–75–8
**NIOSH REL:** 1,000 ppm (1,800 mg/m3) TWA,
1,250 ppm (2,250 mg/m3) STEL
**Current OSHA PEL:** 1,000 ppm (1,800 mg/m3) TWA
**1989 OSHA PEL:** 1,000 ppm (1,800 mg/m3) TWA,
1,250 ppm (2,250 mg/m3) STEL
**1993-1994 ACGIH TLV:** 1,000 ppm (1,640 mg/m3) TWA,
1,250 ppm (2,050 mg/m3) STEL
**Description of substance:** Colorless gas with a strong, characteristic, foul odor.
**LEL**:. . 3.4% (10% LEL, 3,400 ppm)
**Original (SCP) IDLH:** 15,000 ppm
**Basis for original (SCP) IDLH:** Because the TLV for a methyl acetylene-propadiene mixture has been set by analogy to methyl acetylene [ACGIH 1971], the chosen IDLH is also set by analogy with methyl acetylene which has an IDLH of 15,000 ppm.
**Short-term exposure guidelines:** None developed
**ACUTE TOXICITY DATA:**
**Animal or human data:** None relevant for use in determining the revised IDLH.
**Other data:** The American Conference of Governmental Industrial Hygienists TLV for a methyl acetylene-propadiene mixture (MAPP) is based on an analogy to methyl acetylene [ACGIH 1991].

**Revised IDLH:** 3,400 ppm [LEL] **Basis for revised IDLH:** Since a methyl acetylene-propadiene mixture appears to have relatively low toxicity, and based on an analogy to methyl acetylene [ACGIH 1991], the revised IDLH is 3,400 ppm based strictly on safety considerations (i.e., being 10% of the lower explosive limit of 3.4%).**REFERENCES:**
1. ACGIH [1971]. Methyl acetylene-propadiene mixture (MAPP). In: Documentation of the threshold limit values for substances in workroom air. 3rd ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, p. 154.
2. ACGIH [1991]. Methyl acetylene-propadiene mixture. In: Documentation of the threshold limit values and biological exposure indices. 6th ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, p. 930.

			
							
								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
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