# NIOSH Pocket Guide to Chemical Hazards
Demeton | CAS 8065-48-3
(C2H5O)2PSOC2H4SC2H5 | RTECS TF3150000
Synonyms & Trade Names O-O-Diethyl-O(and S)-2-(ethylthio)ethyl phosphorothioate mixture, Systox® | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 0.1 mg/m3 [skin]
OSHA PEL: TWA 0.1 mg/m3 [skin]
IDLH 10 mg/m3 | Conversion
Physical Description Amber, oily liquid with a sulfur-like odor. [insecticide]
MW: 258.3 | BP: Decomposes | FRZ: <-13°F | Sol: 0.01%
VP: 0.0003 mmHg | IP: ? |  | Sp.Gr: 1.12
Fl.P: 113°F | UEL: ? | LEL: ? |
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities Strong oxidizers, alkalis, water
Measurement Methods NIOSH 5514
Personal Protection & Sanitation 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
Respirator Recommendations NIOSH/OSHA Up to 1 mg/m3: (APF = 10) Any supplied-air respirator Up to 2.5 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode Up to 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 10 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, abdominal cramps, diarrhea; localized sweating; muscle fasciculation, lassitude (weakness, exhaustion), paralysis; dizziness, confusion, ataxia; convulsions, coma; low blood pressure; cardiac irregularities
Target Organs Eyes, skin, respiratory system, cardiovascular system, central nervous system, blood cholinesterase
See also: INTRODUCTION