- Phosphorodithioic acid,s,s'-methylene-o,o,o',o'-tetraethyl
- Ethyl methylene phosphordithioate
- O,O,O',O'-Tetraethyl s,S'-methylenediphosphorodithioate
A wettable powder.
Registry Numbers and Inventories.
EC Index Number
Agricultural Chemical and Pesticide; Mutagen; Human Data
Swiss Giftliste 1
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
3E-6 (25 C)
Vapor density (air=1)
Odor Threshold Odor threshold Pure-odorless.
1.3121 g/cm3 (20 C)
Solubility in water
1.543 (20 C)
Partition coefficient, pKow
Heat of vaporization
Hazards and Protection.
Tightly closed containers. Keep away from heat and water, and food products. Do not store emulsifiable concentrate formulation 4 ec below 0 degrees F and formulation 8 ec below 20 degrees F.
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protective gloves and clothing. Face shield or eye protection in combination with breathing portection.
Wear positive pressure self-contained breathing apparatus (SCBA).
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Use natural deep water pockets, excavated lagoons, or sand bag barriers to trap material at bottom. If dissolved, in region of 10 ppm or greater concentration, apply activated carbon at ten times the spilled amount. Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Containers may rupture under fire conditions.
Incompatible with alkaline preparations and formulating materials. Avoid contact with acids, alkalis.
Ethion tends to decompose rapidly with violence above 150 C.
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use foam, dry chemical, or carbon dioxide.
Shock can shatter the container, releasing the contents. Decomposes above 302F. When heated to decomposition it emits highly toxic fumes of oxides of sulfur and phosphorus. Hydrolyzed by acids and alkalies. Slowly oxidized in air.
Dangerous when heated to decomposition. Emits highly toxic fumes of oxides of sulfur and phosphorous.
TLV: ppm; 0.4 mg/m3 (as TWA) (skin) (ACGIH 1997). NIOSH REL: 0.4 mg/m3 skin
Reduced body temperature or elevated body temperature may occur. Low heart rate and abnormally low blood pressure may develop after moderate to severe poisoning. Rapid heart rate, elevated blood pressure, and changes in respiratory rate may also occur. Early giddiness, anxiety headache, and restlessness followed by ataxia, drowsiness, and confusion are common with moderate to severe exposures. Sporadic reports of human birth defects related to organophosphates have not been fully verified.
Vomiting, hypersalivation, diarrhea, fecal incontinence and abdominal pain may occur.
Dyspnea, rales, bronchorrhea, bronchospasm, or tachypnea may be noted. Noncardiogenic pulmonary edema may occur in severe cases. Chemical pneumonitis may be seen.
Sweating is a consistent but not universal sign.
Constriction of the pupil, tearing, and blurred vision are common. Prolonged dialation of the pupils may occur in severe poisonings. Opsoclonus has been reported in one case. Salivation commonly occurs.
Seek medical assistance.
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
Immediately flush with running water for at least 20 minutes.
I; II; III
USCG CHRIS Code
Std. Transport #