- O,O-(Thiodi-4,1-phenylene)phosphorothioic acid, O,O,O,O-tetramethyl ester
- O,O,O',O'-Tetramethyl O,O'-thiodi-p-phenylene bis(phosphorothioate)
- Phosphorothioic acid, o,O'-(thiodi-4,1-phenylene) o,O,O',O'tetramethyl ester
White crystalline solid or liquid. Technical grade is a viscous brown liquid.
Larvicide for mosquitoes, black flies & midges & in other applications.
Registry Numbers and Inventories.
Agricultural Chemical and Pesticide; Reproductive Effector; Primary Irritant
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Vapor pressure, mmHg
1.32 g/cm3 (20 C)
Solubility in water
Hazards and Protection.
Store in cool, dry, well ventilated, secure area out of reach children and animals.
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.
Wear appropriate protective gloves, clothing and goggles.
Wear positive pressure self-contained breathing apparatus (SCBA).
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stable indefinitely at room temperature; no observed hydrolysis at pH 8 at room temperature for several wk or at pH 11 at 40 C for several hr. Optimum stability at pH 5-7 stable @ 25 C and in natural fresh and saline waters.
Incompatible with alkaline substances.
When heated to decomposition it emits toxic phosphorus oxides and sulfur oxides fumes.
43-93 (closed cup)
Dry chemicals, carbon dioxide for small fires. Water spray, foam for large fires.
Combustible material: may burn but does not ignite readily.
Containers may explode when heated.
Fire may produce irritating, corrosive and/or toxic gases.
TLV: ppm; 10 mg/m3 (ACGIH 1994-1995). OSHA PEL: TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp) NIOSH REL: TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)
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.
Nausea, vomiting, abdominal cramps, and diarrhea are common muscarinic effects. Both painless and frank clinical pancreatitis have been reported.
Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
Profuse sweating is common. Pallor may be noted. Dermal sensitization has been reported.
Constriction of the pupil, tearing, and blurred vision are common. Prolonged dialation of the pupils may occur. 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