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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
19931994 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 acetylenepropadiene 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.
Shortterm 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 acetylenepropadiene 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 acetylenepropadiene 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 acetylenepropadiene 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 acetylenepropadiene mixture. In: Documentation of the threshold limit values and biological exposure indices. 6th ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, p. 930. Go back to the Documentation for Immediately Dangerous To Life or Health Concentrations (IDLHs)