NIOSH Pocket Guide to Chemical Hazards


CAS 2104-64-5


RTECS TB1925000
Synonyms & Trade Names
Ethyl p-nitrophenyl benzenethionophosphonate, O-Ethyl O-(4-nitrophenyl) phenylphosphonothioate
DOT ID & Guide


NIOSH REL: TWA 0.5 mg/m3 [skin]
OSHA PEL: TWA 0.5 mg/m3 [skin]
IDLH 5 mg/m3 See: 2104645 Conversion
Physical Description
Yellow solid with an aromatic odor. [pesticide] [Note: A brown liquid above 97°F.]
MW: 323.3
BP: ?
MLT: 97°F
Sol: Insoluble
VP(212°F): 0.0003 mmHg
IP: ?

Sp.Gr(77°F): 1.27
Fl.P: NA

Noncombustible Solid
Incompatibilities & Reactivities
Strong oxidizers
Measurement Methods
NIOSH 5012
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations NIOSH/OSHA
Up to 5 mg/m3:
(APF = 10) Any supplied-air respirator
(APF = 50) Any self-contained breathing apparatus 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
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin; miosis, lacrimation (discharge of tears); rhinorrhea (discharge of thin mucus); headache; chest tightness, wheezing, laryngeal spasm; salivation; cyanosis; anorexia, nausea, abdominal cramps, diarrhea; paralysis, convulsions; low blood pressure, cardiac irregularities
Target Organs Eyes, skin, respiratory system, cardiovascular system, central nervous system, blood cholinesterase
See also: INTRODUCTION   See ICSC CARD: 0753   See MEDICAL TESTS: 0094