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

Dibutyl phosphate

CAS number: 107–66–4

NIOSH REL: 1 ppm (5 mg/m3) TWA, 2 ppm (10 mg/m3) STEL

Current OSHA PEL: 1 ppm (5 mg/m3) TWA

1989 OSHA PEL: 1 ppm (5 mg/m3) TWA, 2 ppm (10 mg/m3) STEL

1993-1994 ACGIH TLV: 1 ppm (8.6 mg/m3) TWA, 2 ppm (17 mg/m3) STEL

Description of Substance: Pale-amber, odorless liquid.

LEL:. . Unknown

Original (SCP) IDLH: 125 ppm

Basis for original (SCP) IDLH: No data on acute inhalation toxicity are available on which to base an IDLH for dibutyl phosphate. Therefore, the chosen IDLH is based on an analogy with tributyl phosphate which has an IDLH of 125 ppm.

Short-term exposure guidelines: None developed

ACUTE TOXICITY DATA

Animal or human data: None relevant for use in determining the revised IDLH.

Revised IDLH: 30 ppm

Basis for revised IDLH: Due to the lack of relevant acute toxicity data, the revised IDLH for dibutyl phosphate is 30 ppm based on an analogy to tributyl phosphate which has a revised IDLH of 30 ppm.

 
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