Synonyms & Trade NamesDibutyl acid o-phosphate, Di-n-butyl hydrogen phosphate, Dibutyl phosphoric acid
DOT ID & Guide
Conversion1 ppm = 8.60 mg/m3
NIOSH RELTWA 1 ppm (5 mg/m3) ST 2 ppm (10 mg/m3)
OSHA PELTWA 1 ppm (5 mg/m3) See Appendix G
Physical DescriptionPale-amber, odorless liquid.
Boiling Point212°F (Decomposes)
Vapor Pressure1 mmHg (approx)
Upper Exposive Limit?
Lower Explosive Limit?
Incompatibilities & ReactivitiesStrong oxidizers
Exposure Routesinhalation, ingestion, skin and/or eye contact
Symptomsirritation eyes, skin, respiratory system; headache
Target OrgansEyes, skin, respiratory system
Personal Protection/Sanitation(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet or contaminated
First Aid(See procedures)
Skin:Soap wash promptly
Swallow:Medical attention immediately
Up to 10 ppm:
(APF = 10) Any supplied-air respirator
Up to 25 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode
Up to 30 ppm:
(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters.
Any appropriate escape-type, self-contained breathing apparatus
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division