# NIOSH Pocket Guide to Chemical Hazards
Dichlorvos | CAS 62-73-7
(CH3O)2P(O)OCH=CCl2 | RTECS TC0350000
Synonyms & Trade Names DDVP; 2,2-Dichlorovinyl dimethyl phosphate | DOT ID & Guide 2783 152
Exposure Limits | NIOSH REL: TWA 1 mg/m3 [skin]
OSHA PEL: TWA 1 mg/m3 [skin]
IDLH 100 mg/m3 | Conversion 1 ppm = 9.04 mg/m3
Physical Description Colorless to amber liquid with a mild, chemical odor. [Note: Insecticide that may be absorbed on a dry carrier.]
MW: 221.0 | BP: Decomposes | FRZ: ? | Sol: 0.5%
VP: 0.01 mmHg | IP: ? |  | Sp.Gr(77°F): 1.42
Fl.P: >175°F | UEL: ? | LEL: ? |
Class III Combustible Liquid
Incompatibilities & Reactivities Strong acids, strong alkalis [Note: Corrosive to iron & mild steel.]
Measurement Methods NIOSH P&CAM295 (II-5); OSHA 62
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 10 mg/m3: (APF = 10) Any supplied-air respirator Up to 25 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode Up to 50 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 100 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 Irritation eyes, skin; miosis, ache eyes; rhinorrhea (discharge of thin mucus); headache; chest tightness, wheezing, laryngeal spasm, salivation; cyanosis; anorexia, nausea, vomiting, diarrhea; sweating; muscle fasciculation, paralysis, dizziness, ataxia; convulsions; low blood pressure, cardiac irregularities
Target Organs Eyes, skin, respiratory system, cardiovascular system, central nervous system, blood cholinesterase
See also: INTRODUCTION