Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information
Home > O,O,O',O'-Tetramethyl O,O'-(thiodi-4,1-phenylene) phosphorothioate > O,O,O',O'-Tetramethyl O,O'-(thiodi-4,1-phenylene) phosphorothioate(3383-96-8)

O,O,O',O'-Tetramethyl O,O'-(thiodi-4,1-phenylene) phosphorothioate(3383-96-8)

Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information

Product Identification

Product Name
O,O,O',O'-Tetramethyl O,O'-(thiodi-4,1-phenylene) phosphorothioate
Synonyms
Difos
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
CAS
3383-96-8
Formula
C16H20O6P2S3
Molecular Weight
466.48
EINECS
222-191-1
RTECS
TF6890000
RTECS Class
Agricultural Chemical and Pesticide; Reproductive Effector; Primary Irritant
Merck
12,9286
Beilstein/Gmelin
1896901

Physical and Chemical Properties

Appearance
White crystalline solid or liquid. Technical grade is a viscous brown liquid.
Solubility in water
insoulble
Melting Point
30.6
Vapor Pressure
9.0e-10
Density
1.32 g/cm3 (20 C)
Usage
Larvicide for mosquitoes, black flies & midges & in other applications.

First Aid Measures

Ingestion
Seek medical assistance.
Inhalation
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.
Skin
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.
Eyes
Immediately flush with running water for at least 20 minutes.

Handling and Storage

Storage
Store in cool, dry, well ventilated, secure area out of reach children and animals.
Handling
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.

Hazards Identification

Inhalation
Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
Skin
Profuse sweating is common. Pallor may be noted. Dermal sensitization has been reported.
Eyes
Constriction of the pupil, tearing, and blurred vision are common. Prolonged dialation of the pupils may occur. Salivation commonly occurs.
Ingestion
Nausea, vomiting, abdominal cramps, and diarrhea are common muscarinic effects. Both painless and frank clinical pancreatitis have been reported.
Hazards
Containers may explode when heated.
UN (DOT)
2783

Exposure Controls/Personal Protection

Personal Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Exposure Effects
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.
Exposure limit(s)
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)
Poison Class
4

Fire Fighting Measures

Flash Point
43-93 (closed cup)
Fire Fighting
Dry chemicals, carbon dioxide for small fires. Water spray, foam for large fires.
Fire Potential
Combustible material: may burn but does not ignite readily.

Accidental Release Measures

Small spills/leaks
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.

Stability and Reactivity

Incompatibilities
Incompatible with alkaline substances.
Stability
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.
Decomposition
When heated to decomposition it emits toxic phosphorus oxides and sulfur oxides fumes.
Combustion Products
Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number
2783
Hazard Class
6.1
Packing Group
I; II; III
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