Product: 655-598 Prentox(R) Malathion 50% Emulsifiable Insecticide
Material Safety Data Sheet
U.S. Department of Labor (OSHA 29 CFR 1910.1200)
Manufacturer's Name: Prentiss Incorporated
C. B. 2000
Floral Park, NY 11001
Telephone Number: (516) 326-1919
Section 1: Chemical Identification
Product: 655-598 Prentox(R) Malathion 50% Emulsifiable Insecticide
EPA Signal Word: WARNING
Active Ingredient (%): Malathion (50%) (CAS# 121-75-5)
Chemical Name: O,O-dimethyl dithiophosphate of diethyl mercaptosuccinate
Chemical Class: Organophosphate Insecticide Mixture
Section 2: Composition/Information on Ingredients
OSHA ACGIH NTP/IARC/OSHA
Material: PEL TLV Carcinogen
No/No/No
Malathion 10 mg/M 10 mg/M
3 3
(Skin) (TWA) (Skin) (TWA)
Xylene Range Aromatic Solvent (CAS # 64742-95-6) (40.84%) See below
Contains the following regulated ingredients, by weight (typical):
1,2,4-Trimethyl Benzene (CAS # 95-63-6) 32.0 (TWA) 25 ppm
Mixed Xylenes (CAS # 1330-20-7) 3.0 (TWA) 100 ppm
Cumene (CAS # 98-82-8) 1.5 (TWA) 50 ppm
Ethyl Benzene (CAS # 100-41-4) 0.5 (TWA) 100 ppm
Emulsifier (CAS # N/A) (6.0%) N/D N/D
Section 3: Hazards Identification
Routes of Exposure:
Inhalation: Yes Skin: Yes Ingestion: Yes
Acute and Chronic Exposure: Causes severe but reversible eye damage. Malathion is a cholinesterase
inhibitor of low mammalian toxicity. However, prolonged storage at temperatures exceeding 78 F (25 C)
causes formation of the more toxic and synergistic contaminant isomalathion (LD50, oral, rat, 89 mg/Kg).
Acute exposure to malathion may cause death due to cholinesterase inhibition. Repeated exposure to
cholinesterase inhibitors such as malathion may, without warning, cause increased susceptibility to doses
of any cholinesterase inhibitor. Signs and symptoms of exposure include headache, nausea, vomiting,
cramps, weakness, blurred vision, pinpoint pupils, tightness in chest, labored breathing, nervousness,
sweating, watering of eyes, drooling or frothing of mouth and nose, muscle spasms and coma. Note to
Physician: Malathion, upon repeated, prolonged or careless use may cause cholinesterase inhibition.
Atropine is antidotal. Toxicity of other components: Xylene Range Aromatic Solvent: Inhalation:
high vapor concentrations are irritating to the eyes and the respiratory tract, may cause headaches,
dizziness, anesthesia, drowsiness, unconsciousness, and other central nervous system effects, including
death. Skin contact: frequent or prolonged contact may irritate and cause dermatitis, low order of
toxicity. Skin contact may aggravate an existing dermatitis condition. Eye contact: Slightly irritating but
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Product: 655-598 Prentox(R) Malathion 50% Emulsifiable Insecticide
does not injure eye. Ingestion: Small amounts aspirated into the respiratory system during ingestion or
vomiting may cause mild to severe pulmonary injury, possibly progressing to death. Emulsifier: Eye
contact: May cause irritation and burns. Skin contact: May cause irritation. Prolonged or repeated skin
contact may cause defatting, drying, dermatitis. Inhalation: May cause irritation, coughing, headache,
nausea, drowsiness. Prolonged or repeated overexposure by inhalation may cause central nervous system
depression (CNS). Symptoms of early to moderate CNS depression include giddiness, dizziness,
confusion, drunken behavior, headache, nausea, diarrhea, vomiting, tiredness and drowsiness. In extreme
cases, CNS depression may cause stupor, convulsions, unconsciousness, coma and even death.
Ingestion: May cause nausea, vomiting, diarrhea, aspiration (breathing) of liquid, mist or vomitus into
lungs may cause aspiration pneumonia, hemorrhaging, lung damage and even death. Symptoms of
aspiration pneumonia include coughing, labored breathing and bluish skin.
Carcinogenicity: Malathion is not listed by NTP, IARC or regulated by OSHA as a carcinogen.
Medical Conditions Generally Aggravated by Exposure: Repeated exposures to cholinesterase
inhibitors such as this product may, without warning, cause increased susceptibility to doses of any
cholinesterase inhibitor.
Section 4: First Aid
Call a physician, Poison Control Center, or the National Pesticide Information Center at 1-800-858-7378
for treatment advice.
If swallowed: Do not induce vomiting unless told to do so by a physician or Poison Control Center. Do
not give anything by mouth to an unconscious or convulsing person. If on skin or clothing: Take off
contaminated clothing. Rinse skin immediately with water for 15-20 minutes. If inhaled: Move person
to fresh air. If person is not breathing call 911 or an ambulance, then give artificial respiration, preferably
mouth to mouth, if possible. If in eyes: Hold eye open and rinse slowly and gently with water for 15-20
minutes. Remove contact lenses, if present, after the first 5 minutes, then continue rinsing eye.
Note to physician: Malathion upon repeated, prolonged or careless use may cause cholinesterase
inhibition. Atropine is antidotal.
Section 5: Fire Fighting Measures
110o F. closed cup.
Flash Point (Method Used):
Flammable Limits: LEL: 1.9 UEL: 12.6 (Solvent - approximate)
Extinguishing Media: Dry chemical, CO2, foam or water spray. Avoid heavy hose streams to prevent
spread of contaminated runoff.
Special Fire Fighting Procedures: Keep containers cool by spraying with water if exposed to fire.
Fight fires from upwind. This pesticide is toxic to aquatic invertebrates and aquatic life stages of
amphibians. Do not discharge effluent containing this product into lakes, streams, ponds, estuaries,
oceans or public waters. Do not use heavy streams of water in order to prevent spread of contaminated
runoff. Wear self contained breathing apparatus.
Unusual Fire and Explosion Hazards: Malathion decomposes when heated above 100o C. Explosions
of sealed containers may occur. May give off dimethyl sulfoxide, sulfur dioxide, CO, CO2 and
phosphorus pentoxide upon exposure to high temperatures.
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Product: 655-598 Prentox(R) Malathion 50% Emulsifiable Insecticide
Section 6: Accidental Release Measures
Wear long sleeved shirt and long pants, chemical resistant gloves, such as barrier laminate, or Viton庐,
protective eyewear such as goggles and shoes plus socks. In enclosed areas wear suitable respiratory
protection to prevent inhalation of vapors. Cover the spilled material with generous amounts of
absorbent material, such as clay, diatomaceous earth, sand or sawdust. Sweep up the contaminated
absorbent onto a shovel and put the sweepings into a salvage drum. Dispose of wastes as below. Place
any leaking container into a similar drum or glass container.
Waste disposal method: Pesticide wastes are toxic. Improper disposal of excess pesticide, spray
mixture or rinsate is a violation of Federal Law. If these wastes cannot be disposed of by use according
to label instructions, contact your State Pesticide or Environmental Control Agency, or the Hazardous
Waste representative at the nearest EPA Regional Office for guidance.
Container disposal: Triple rinse (or equivalent). Then offer for recycling or reconditioning, or puncture
and dispose of in a sanitary landfill, or by other procedures approved by State and local authorities.
Section 7: Handling and Storage
Precautions for handling and storage: Do not contaminate water, food or feed. Wash hands, arms
and face with soap and water after use and before eating or smoking. Remove contaminated clothing and
wash with soap and hot water before reuse.
Other precautions: Harmful if swallowed. Avoid breathing of vapors. Avoid contact with skin. Avoid
contamination of water, feed or foodstuffs. Periodically inspect stored materials.
Section 8: Exposure Controls/Personal Protection
Respiratory protection: Use an approved pesticide respirator protecting against organophosphorus
vapors.
Ventilation:
Local Exhaust: As required to meet TLV values.
Special: None.
Mechanical: As required to meet TLV values.
Other: None.
Protective Gloves: Chemical resistant such as barrier laminate or Viton庐
Eye Protection: Safety glasses or goggles.
Other protective clothing or equipment: Wear long sleeved shirt, long pants, shoes and socks.
Work/Hygienic practices: Wash thoroughly after handling and before eating or smoking. Persons
working with this product for long periods of time, or on a frequent basis, should have frequent blood
tests of their cholinesterase levels. If the cholinesterase falls below the critical point, no further exposure
should be allowed until it has been determined by means of blood tests the cholinesterase levels have
returned to normal. Before removing gloves, wash them with soap and water. As soon as possible, wash
thoroughly and change into clean clothing.
Section 9: Physical and Chemical Properties
Boiling Point: N/D
Specific Gravity (H2O = 1): 1.0284
Vapor Pressure (mmHg): N/D
Melting Point: N/D
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Product: 655-598 Prentox(R) Malathion 50% Emulsifiable Insecticide
Vapor Density (Air = 1): N/D
Evaporation Rate (Butyl Acetate = 1): N/D
Solubility in Water: Emulsifies.
Appearance and Odor: Water white to yellow liquid, mercaptan like odor.
Section 10: Stability and Reactivity
Stability: Stable.
Conditions to avoid for stability: Avoid storage at temperatures in excess of
78o F. for best stability.
Incompatibility: Alkalies, iron and strong oxidizers.
Hazardous Decomposition or Byproducts: CO, CO2, phosphorus pentoxide,
malaoxon, dimethyl sulfide, sulfur dioxide,
and oxides of nitrogen.
Hazardous Polymerization: Will not occur.
Conditions to avoid for Hazardous Polymerization: None.
Section 11: Toxicological Information
Acute Toxicity (Malathion, except where noted):
Ingestion: Oral LD50 (Rat) 5,500 mg/Kg
Dermal: Dermal LD50 (Rat) >2,000 mg/Kg
Inhalation: Inhalation LC50 (Rat) >5.2 mg/L/ 4 hour
Eye Contact: This product is a severe eye irritant
Skin Contact: This product is a moderate primary skin irritant
Skin Sensitization: Not a skin sensitizer
Carcinogenicity: IARC evaluation: the available data provide no evidence that malathion is likely to
present a carcinogenic risk to humans.
Reproductive Effects: No effects on reproduction are found for malathion in rats and rabbits at maternal
non toxic doses.
Teratogenicity: No indications of teratogenic effects of malathion are found.
Mutagenicity: Malathion is not mutagenic.
Section 12: Ecological Information
Malathion is biodegradable. It undergoes rapid degradation in the environment and in waste water
treatment plants. No adverse effects are observed at concentrations up to 100 mg/L in waste water
treatment plants. Degradation occurs both aerobically and anaerobically, biologically as well as
abiologically. Under normal conditions malathion is of medium mobility in soil, but is degraded rapidly.
Malathion is toxic to fish, aquatic invertebrates, and aquatic life stages of amphibians. Malathion is highly
toxic to bees.
Acute toxicity:
Fish 96-h LC50, Rainbow Trout 0.200 mg/L
Invertebrates 48-h LC50, daphnia magna 1.0 矛g/L
Birds LD50, Bobwhite Quail 400 mg/Kg
Honeybee 24-h LD50, topical 0.27 矛g/bee
24-h LD50, oral 0.38 矛g/bee
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Product: 655-598 Prentox(R) Malathion 50% Emulsifiable Insecticide
Section 13: Disposal Considerations
Waste disposal method 鈥? follow label instructions for disposal of wastes generated during use in
compliance with FIFRA product label. Container disposal 鈥? if empty, place in trash or offer for recycling
if available. If partially full, call your local solid waste agency or 1-800-CLEANUP for disposal
instructions.
Section 14: Transport Information
DOT Classification: COMBUSTIBLE LIQUID, N.O.S. (PETROLEUM NAPHTHA),
NA1993,PGIII, RQ* (MALATHION)
Freight Classification: INSECTICIDES; OTHER THAN POISON, NMFC ITEM 102120
International Transportation: Not available.
Section 15: Regulatory Information
OSHA Status: This product is hazardous under the criteria of the Federal OSHA Hazard
Communication Standard 29 CFR 1910.1200.
TSCA Status: This product is exempt from TSCA regulation under FIFRA Section 3 (2) (B) (ii)
when used as a pesticide.
SARA Title III Classification:
Section 302, Extremely Hazardous Substances:
Ethyl Benzene
Mixed Xylenes
Section 311/312: Acute health hazard, chronic health hazard, fire hazard
Section 313 chemicals:
Malathion (50%) (CAS# 121-75-5)
1,2,4-Trimethyl Benzene (13.07%) (CAS # 95-63-6)
Mixed Xylenes (1.23%) (CAS # 1330-20-7)
Cumene (0.61%) (CAS # 98-82-8)
Ethyl Benzene (0.002%) (CAS # 100-41-4)
This product contains a toxic chemical or chemicals subject to the reporting requirements of
Section 313 of Title III and of 40 CFR 372. Any copies or redistribution of this MSDS must
include this notice.
CERCLA Reportable Quantity: 200 lb. of this formula which contains 100 lb. of malathion
RCRA Status: This product does not contain any RCRA listed hazardous wastes
Section 16: Other Information
NFPA Hazard Ratings: Health: 2 Flammability: 2 Reactivity: 1
Date Prepared: December 3, 2002 Supersedes: December 16, 1994 Reason: Complete
reformat/revision
____________________________________________________________________________________
The information and recommendations contained herein are based upon data believed to be
correct. However, no guarantee or warranty of any kind, expressed or implied, is made with
respect to the information contained herein. Prentox庐 is a registered trademark of Prentiss
Incorporated. Viton庐 is a registered trademark of DuPont Dow Elastomers.
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