# NIOSH Pocket Guide to Chemical Hazards
Triphenyl phosphate | CAS 115-86-6
(C6H5O)3PO | RTECS TC8400000
Synonyms & Trade Names Phenyl phosphate, TPP, Triphenyl ester of phosphoric acid | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 3 mg/m3
OSHA PEL: TWA 3 mg/m3
IDLH 1000 mg/m3 | Conversion
Physical Description Colorless, crystalline powder with a phenol-like odor.
MW: 326.3 | BP: 776°F | MLT: 120°F | Sol(129°F): 0.002%
VP(380°F): 1 mmHg | IP: ? |  | Sp.Gr: 1.29
Fl.P: 428°F | UEL: ? | LEL: ? |
Combustible Solid
Incompatibilities & Reactivities None reported
Measurement Methods NIOSH 5038
Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: No recommendation | First Aid (See procedures) Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 15 mg/m3: (APF = 5) Any dust respirator Up to 30 mg/m3: (APF = 10) Any air-purifying respirator with a high-efficiency particulate filter/(APF = 10) Any dust respirator except single-use and quarter-mask respirators/(APF = 10) Any supplied-air respirator Up to 75 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter Up to 150 mg/m3: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and a high-efficiency particulate filter/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 1000 mg/m3: (APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode 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 Escape: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion
Symptoms Minor changes in blood enzymes; in animals: muscle weakness, paralysis
Target Organs Blood, peripheral nervous system
See also: INTRODUCTION