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O,O-Diethyl-S-methyl phosphorodithioate isan organophosphate and the methyl derivative of O,Odiethyl dithiophosphoric acid. The compound has partlyinsecticidal, acaricidal, and fungicidal activity and is usefulas an intermediate for organic synthesis.

Solid.

Organothiophosphates, such as O,O-Diethyl S-methyl dithiophosphate, are susceptible to formation of highly toxic and flammable phosphine gas in the presence of strong reducing agents such as hydrides. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides.

Inhalation of material may be harmful. Contact may cause burns to skin and eyes. Inhalation of Asbestos dust may have a damaging effect on the lungs. Fire may produce irritating, corrosive and/or toxic gases. Some liquids produce vapors that may cause dizziness or suffocation. Runoff from fire control may cause pollution.

Some may burn but none ignite readily. Containers may explode when heated. Some may be transported hot.

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Speed in removing material from skinis of extreme importance. Shampoo hair promptly if contaminated. Seek medical attention immediately. If thischemical has been inhaled, remove from exposure, beginrescue breathing (using universal precautions, includingresuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medical attention. Give large quantities of water and inducevomiting. Do not make an unconscious person vomit.Medical observation is recommended.

Color Code—Blue: Health Hazard/Poison: Storein a secure poison location. Prior to working with thischemical you should be trained on its proper handling andstorage. Store in tightly closed containers in a cool, wellventilated area away from oxidizers and reducing agents.

Organophosphorus pesticides, liquid, toxic n.o.s.require a label of “POISONOUS/TOXIC MATERIALS.”They fall in DOT Hazard Class 6.1 and Packing Group III.

Many organic phosphorus insecticides are absorbed by the skin, as well as by the respiratoryand gastrointestinal tracts. They are cholinesterase inhibitors. Symptoms of exposure include headache, giddiness,blurred vision, nervousness, weakness, nausea, cramps,diarrhea, and discomfort in the chest. Signs include sweating, tearing, salivation, vomiting, cyanosis, convulsions,coma, loss of reflexes, and loss of sphincter control.

There is no available information onthe possible carcinogenic, mutagenic, teratogenic, oradverse reproductive effects of O,O-diethyl-S-methyl phosphorodithioate. It, like other organophosphate compounds,is expected to produce cholinesterase inhibition in humans.There are no available data on the aquatic toxicity of thiscompound. The oral LD50 mouse is 156 mg/kg (moderatelytoxic).

Wear protective gloves andclothing to prevent any reasonable probability of skin contact. Safety equipment suppliers/manufacturers can providerecommendations on the most protective glove/clothingmaterial for your operation. All protective clothing (suits,gloves, footwear, headgear) should be clean, availableeach day, and put on before work. Contact lenses shouldnot be worn when working with this chemical. Wearsplash-proof goggles and face shield if working with the liquid or dust-proof chemical goggles and face shield if working with dry material unless full face-piece respiratoryprotection is worn. Employees should wash immediatelywith soap when skin is wet or contaminated. Provide emergency showers and eyewash.

Use dry chemical, carbon dioxide,water spray, or alcohol foam extinguishers. Poisonous gasesare produced in fire. If material or contaminated runoffenters waterways, notify downstream users of potentiallycontaminated waters. Notify local health and fire officialsand pollution control agencies. From a secure, explosionproof location, use water spray to cool exposed containers.If cooling streams are ineffective (venting sound increasesin volume and pitch, tank discolors, or shows any signs ofdeforming), withdraw immediately to a secure position. Ifemployees are expected to fight fires, they must be trainedand equipped in OSHA 1910.156. The only respiratorsrecommended for firefighting are self-contained breathingapparatuses that have full face-pieces and are operated in apressure-demand or other positive-pressure mode.

In accordance with40CFR165, follow recommendations for the disposal ofpesticides and pesticide containers. Must be disposed properly by following package label directions or by contactingyour local or federal environmental control agency or bycontacting your regional EPA office. Consult with environmental regulatory agencies for guidance onacceptable disposal practices. Generators of waste containing this contaminant ($100 kg/mo) must conform withEPA regulations governing storage, transportation, treatment, and waste disposal.