CHLORPYRIFOS

International Chemical Safety Cards

CHLORPYRIFOS

ICSC: 0851

CHLORPYRIFOS
O,O-Diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate
C₉H₁₁Cl₃NO₃PS
Molecular mass: 350.6
CAS # 2921-88-2
RTECS # TF6300000
ICSC # 0851
UN # 2783
EC # 015-084-00-4

TYPES OF HAZARD/ EXPOSURE	ACUTE HAZARDS/ SYMPTOMS	PREVENTION	FIRST AID/ FIRE FIGHTING
FIRE	Combustible. Liquid formulations containing organic solvents may be flammable. Gives off irritating or toxic fumes (or gases) in a fire.	NO open flames.	Powder, water spray, foam, carbon dioxide.
EXPLOSION	The explosion hazard will depend on the solvent used in the formulation.

EXPOSURE		STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!	IN ALL CASES CONSULT A DOCTOR!
INHALATION	Convulsions. Dizziness. Laboured breathing. Nausea. Unconsciousness. Vomiting. Pupillary constriction, muscle cramp, excessive salivation.	Ventilation (not if powder), local exhaust, or breathing protection.	Fresh air, rest. Refer for medical attention.
SKIN	MAY BE ABSORBED! (further see Inhalation).	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
EYES	Blurred vision.	Face shield or eye protection in combination with breathing protection if powder.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
INGESTION	Abdominal cramps. Diarrhoea. Laboured breathing. Nausea. Unconsciousness. Vomiting. Blurred vision, muscle cramps.	Do not eat, drink, or smoke during work.	Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Rest. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Do NOT wash away into sewers. Sweep spilled substance into containers, carefully collect remainder, then remove to safe place. (extra personal protection: complete protective clothing including self-contained breathing apparatus).

Separated from food and feedstuffs, strong bases. Dry. Keep in a well-ventilated room.

Do not transport with food and feedstuffs.
T symbol
R: 23/24/25
S: 2-13-44
UN Haz Class: 6.1
UN Pack Group: III

SEE IMPORTANT INFORMATION ON BACK

ICSC: 0851

Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities © IPCS CEC 1990

International Chemical Safety Cards

CHLORPYRIFOS

ICSC: 0851

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PHYSICAL STATE; APPEARANCE
COLOURLESS CRYSTALS.

PHYSICAL DANGERS:

CHEMICAL DANGERS:
The substance decomposes on heating at approximately 160°C and on burning producing toxic and corrosive fumes including hydrogen chloride, nitrogen oxides, phosphorous oxides, sulfur oxides. Reacts with strong bases. Attacks copper and brass.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: ppm; 0.2 mg/m³ (skin) (ACGIH 1991-1992).

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol, through the skin, and by ingestion.

INHALATION RISK:
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly on spraying or when dispersed, especially if powdered.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance may cause effects on the nervous system , resulting in convulsions, respiratory failure. Cholinesterase inhibitor. Exposure at high levels may result in death. The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Cholinesterase inhibitor; cumulative effect is possible: see acute hazards/symptoms.

PHYSICAL
PROPERTIES

Melting point: 41-43.5°C
Relative density (water = 1): 1.398 at 43.5°C
Solubility in water: None

Vapour pressure, Pa at 25°C: 2.5 x 10-3
Octanol/water partition coefficient as log Pow: 4.96