# NIOSH Pocket Guide to Chemical Hazards
TEPP | CAS 107-49-3
[(CH3CH2O)2PO]2O | RTECS UX6825000
Synonyms & Trade Names Ethyl pyrophosphate, Tetraethyl pyrophosphate, Tetron® | DOT ID & Guide 2783 152 3018 152 (liquid)
Exposure Limits | NIOSH REL: TWA 0.05 mg/m3 [skin]
OSHA PEL: TWA 0.05 mg/m3 [skin]
IDLH 5 mg/m3 | Conversion 1 ppm = 11.87 mg/m3
Physical Description Colorless to amber liquid with a faint, fruity odor. [insecticide] [Note: A solid below 32°F.]
MW: 290.2 | BP: Decomposes | FRZ: 32°F | Sol: Miscible
VP: 0.0002 mmHg | IP: ? |  | Sp.Gr: 1.19
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Liquid
Incompatibilities & Reactivities Strong oxidizers, alkalis, water [Note: Hydrolyzes quickly in water to form pyrophosphoric acid.]
Measurement Methods NIOSH 2504
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation Provide: Eyewash, Quick drench | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 0.5 mg/m3: (APF = 10) Any supplied-air respirator Up to 1.25 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode Up to 2.5 mg/m3: (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 Up to 5 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 (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Eye pain, blurred vision, lacrimation (discharge of tears); rhinorrhea (discharge of thin mucus); headache, chest tightness, cyanosis; anorexia, nausea, vomiting, diarrhea; lassitude (weakness, exhaustion), twitching, paralysis, Cheyne-Stokes respiration, convulsions; low blood pressure, cardiac irregularities; sweating
Target Organs Eyes, respiratory system, central nervous system, cardiovascular system, gastrointestinal tract, blood cholinesterase
See also: INTRODUCTION