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TEPP

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Synonyms & Trade Names
Ethyl pyrophosphate, Tetraethyl pyrophosphate, Tetron®
CAS No.
107-49-3
RTECS No.
UX6825000
DOT ID & Guide
2783 152(solid)
3018 152(liquid)
Formula
[(CH₃CH₂O)₂PO]₂O
Conversion
1 ppm = 11.87 mg/m3
IDLH
5 mg/m3
See: 107493
Exposure Limits
NIOSH REL
TWA 0.05 mg/m3 [skin]
OSHA PEL
TWA 0.05 mg/m3 [skin]
Measurement Methods
NIOSH 2504
See: NMAM or OSHA Methods
Physical Description
Colorless to amber liquid with a faint, fruity odor. [insecticide] [Note: A solid below 32°F.]
Molecular Weight
290.2
Boiling Point
Decomposes
Freezing Point
32°F
Solubility
Miscible
Vapor Pressure
0.0002 mmHg
Ionization Potential
?
Specific Gravity
1.19
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Noncombustible Liquid
Incompatibilities & Reactivities
Strong oxidizers, alkalis, water [Note: Hydrolyzes quickly in water to form pyrophosphoric acid.]
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
Eye pain, blurred vision, lacrimation (discharge of tears); rhinorrhea (discharge of thin nasal mucus); headache, chest tightness, cyanosis; anorexia, nausea, vomiting, diarrhea; lassitude (weakness, exhaustion), twitching, paralysis, Cheyne-Stokes respiration, convulsions; low blood pressure, cardiac irreg; sweating
Target Organs
Eyes, respiratory system, central nervous system, cardiovascular system, gastrointestinal tract, blood cholinesterase
Personal Protection/Sanitation
(See protection codes)
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 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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 1158   MEDICAL TESTS: 0221
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health