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FENTHION

6.1 - Poison
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The Chemical Identifier fields include common identification numbers, the NFPA diamond U.S. Department of Transportation hazard labels, and a general description of the chemical. The information in CAMEO Chemicals comes from a variety of data sources.
CAS Number UN/NA Number
  • 55-38-9
DOT Hazard Label USCG CHRIS Code
  • Poison
none
NIOSH Pocket Guide International Chem Safety Card
Fenthionexternal_link
NFPA 704
data unavailable
General Description
PHYSICAL DESCRIPTION: Yellow to tan oily liquid with a slight odor of garlic. (NTP, 1992)

The Hazard fields include special hazard alerts air and water reactions, fire hazards, health hazards, a reactivity profile, and details about reactive groups assignments and potentially incompatible absorbents. The information in CAMEO Chemicals comes from a variety of data sources.
Reactivity Alerts
none
Air & Water Reactions
No rapid reaction with air. No rapid reaction with water.
Fire Hazard
This compound is probably combustible. (NTP, 1992)
Health Hazard
Excerpt from NIOSH Pocket Guide for Fenthionexternal link:

Exposure Routes: Inhalation, skin absorption, ingestion, skin and/or eye contact

Symptoms: Nausea, vomiting, abdominal cramps, diarrhea, salivation; headache, dizziness, lassitude (weakness, exhaustion); rhinorrhea (discharge of thin nasal mucus), chest tightness; blurred vision, miosis; cardiac irregularities; muscle fasciculation; dyspnea (breathing difficulty)

Target Organs: Respiratory system, central nervous system, cardiovascular system, plasma cholinesterase (NIOSH, 2023)
Reactivity Profile
FENTHION may react with strong reducing agents such as hydrides to generate highly toxic and flammable phosphine gas. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides.
Belongs to the Following Reactive Group(s)
Potentially Incompatible Absorbents

No information available.

The Response Recommendation fields include isolation and evacuation distances, as well as recommendations for firefighting, non-fire response, protective clothing, and first aid. The information in CAMEO Chemicals comes from a variety of data sources.
Isolation and Evacuation
Excerpt from ERG Guide 152 [Substances - Toxic (Combustible)]:

IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.

SPILL: Increase the immediate precautionary measure distance, in the downwind direction, as necessary.

FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2020)
Firefighting
Fires involving this material can be cntrolled with a dry chemical. carbon dioxide, foam or Halon extinguisher. (NTP, 1992)
Non-Fire Response
SMALL SPILLS AND LEAKAGE: If you spill this chemical, use absorbent paper to pick up all liquid spill material. Your contaminated clothing and absorbent paper should be sealed in a vapor-tight plastic bag for eventual disposal. Solvent wash all contaminated surfaces with alcohol followed by washing with a strong soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.

STORAGE PRECAUTIONS: You should store this material in a refrigerator. (NTP, 1992)
Protective Clothing
Excerpt from NIOSH Pocket Guide for Fenthionexternal link:

Skin: PREVENT SKIN CONTACT - Wear appropriate personal protective clothing to prevent skin contact.

Eyes: PREVENT EYE CONTACT - Wear appropriate eye protection to prevent eye contact.

Wash skin: WHEN CONTAMINATED - The worker should immediately wash the skin when it becomes contaminated.

Remove: WHEN WET OR CONTAMINATED - Work clothing that becomes wet or significantly contaminated should be removed and replaced.

Change: DAILY - Workers whose clothing may have become contaminated should change into uncontaminated clothing before leaving the work premises. (NIOSH, 2023)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.

INHALATION: IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used; if not available, use a level of protection greater than or equal to that advised under Protective Clothing.

INGESTION: CHOLINESTERASE INHIBITORS ARE EXTREMELY TOXIC AND FAST-ACTING POISONS. IMMEDIATELY call a hospital of poison control center and transport the victim to a hospital. Atropine is an antidote for cholinesterase inhibitors but should only be administered by properly trained personnel. In the absence of this option and if the victim is conscious and not convulsing, it may be worth considering the risk of inducing vomiting, even though the induction of vomiting is not usually recommended outside of a physician's care. Ipecac syrup or salt water may be used to induce vomiting in such an emergency. If the victim is convulsing or unconscious, do not give anything by mouth, assure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. IMMEDIATELY transport the victim to a hospital. (NTP, 1992)

The Physical Property fields include properties such as vapor pressure and boiling point, as well as explosive limits and toxic exposure thresholds The information in CAMEO Chemicals comes from a variety of data sources.

Note: For Vapor Density and Specific Gravity, comparing the value to 1.0 can tell you if the chemical will likely sink/rise in air or sink/float in fresh water (respectively). Short phrases have been added to those values below as an aid. However, make sure to also consider the circumstances of a release. The Vapor Density comparisons are only valid when the gas escaping is at the same temperature as the surrounding air itself. If the chemical is escaping from a container where it was pressurized or refrigerated, it may first escape and behave as a heavy gas and sink in the air (even if it has a Vapor Density value less than 1). Also, the Specific Gravity comparisons are for fresh water (density 1.0 g/mL). If your spill is in salt water (density about 1.027 g/mL), you need to adjust the point of comparison. There are some chemicals that will sink in fresh water and float in salt water.
Chemical Formula:
  • C10H15O3PS2
Flash Point: data unavailable
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature: data unavailable
Melting Point: 43°F (NIOSH, 2023)
Vapor Pressure: 3e-05 mmHg at 68°F (NTP, 1992)
Vapor Density (Relative to Air): data unavailable
Specific Gravity: 1.25 at 68°F (NTP, 1992) - Denser than water; will sink
Boiling Point: 189°F at 0.01 mmHg (NTP, 1992)
Molecular Weight: 278.34 (NTP, 1992)
Water Solubility: Insoluble (<1 mg/ml at 72.5°F) (NTP, 1992)
Ionization Energy/Potential: data unavailable
IDLH: data unavailable

AEGLs (Acute Exposure Guideline Levels)

No AEGL information available.

ERPGs (Emergency Response Planning Guidelines)

No ERPG information available.

PACs (Protective Action Criteria)

Chemical PAC-1 PAC-2 PAC-3
Fenthion (55-38-9) 0.15 mg/m3 5.9 mg/m3 35 mg/m3
(DOE, 2018)

The Regulatory Information fields include information from the U.S. Environmental Protection Agency's Title III Consolidated List of Lists, the U.S. Cybersecurity and Infrastructure Security Agency's Chemical Facility Anti-Terrorism Standards, and the U.S. Occupational Safety and Health Administration's Process Safety Management of Highly Hazardous Chemicals Standard List (see more about these data sources).

EPA Consolidated List of Lists

Regulatory Name CAS Number/
313 Category Code
EPCRA 302
EHS TPQ
EPCRA 304
EHS RQ
CERCLA RQ EPCRA 313
TRI
RCRA
Code
CAA 112(r)
RMP TQ
Fenthion 55-38-9 313

(EPA List of Lists, 2022)

CISA Chemical Facility Anti-Terrorism Standards (CFATS)

No regulatory information available.

OSHA Process Safety Management (PSM) Standard List

No regulatory information available.

This section provides a listing of alternate names for this chemical, including trade names and synonyms.
  • B 29493
  • BAY 29493
  • BAYCID
  • BAYER 29493
  • BAYER 9007
  • BAYER S-1752
  • BAYTEX
  • DIMETHYL 4-METHYLTHIO-M-TOLYL PHOSPHOROTHIOATE
  • DMTP
  • ENT 25,540
  • ENT 25540
  • ENTEX
  • FENTHION
  • FENTHION-METHYL
  • LEBAYCID
  • M-CRESOL, 4-(METHYLTHIO)-, O-ESTER WITH O,O-DIMETHYL PHOSPHOROTHIOATE
  • MERCAPTOFOS
  • MERCAPTOPHOS
  • MPP
  • MPP (PESTICIDE)
  • NCI-C08651
  • O,O-DIMETHYL O-(3-METHYL-4-(METHYLTHIO) PHENYL) ES
  • O,O-DIMETHYL O-(3-METHYL-4-(METHYLTHIO) PHENYL) ESTER, PHOSPHOROTHIOIC ACID
  • O,O-DIMETHYL O-(3-METHYL-4-METHYLMERCAPTOPHENYL) PHOSPHOROTHIOATE
  • O,O-DIMETHYL O-(3-METHYL-4-METHYLTHIOPHENYL) THIOPHOSPHATE
  • O,O-DIMETHYL O-(4-METHYLTHIO-3-METHYLPHENYL) PHOSPHOROTHIOATE
  • O,O-DIMETHYL O-3-METHYL-4-METHYLTHIOPHENYL PHOSPHOROTHIOATE
  • O,O-DIMETHYL O-4-(METHYLMERCAPTO)-3-METHYLPHENYL PHOSPHOROTHIOATE
  • O,O-DIMETHYL O-4-(METHYLMERCAPTO)-3-METHYLPHENYL THIOPHOSPHATE
  • O,O-DIMETHYL O-[3-METHYL-4-(METHYLTHIO)PHENYL] PHOSPHOROTHIOATE
  • O,O-DIMETHYL O-[4-(METHYLTHIO)-M-TOLYL] PHOSPHOROTHIOATE
  • O,O-DIMETHYL O-[4-(METHYLTHIO)-M-TOLYL] THIOPHOSPHATE
  • O,O-DIMETHYL-(O-(4-METHYLTHIO)-M-TOLYL)PHOSPHOROTHIOIC ACID ESTER
  • O,O-DIMETHYL-O-(4-(METHYLTHIO)-M-TOLYL)PHOSPHOROTHIOATE
  • O,O-DIMETHYL-O-3-METHYL-4-METHYLTHIOPHENYL PHOSPHOROTHIOATE
  • O,O-DIMETHYL-O-4-(METHYLMERCAPTO)-3-METHYLPHENYL PHOSPHOROTHIOATE
  • O,O-DIMETHYL-O-4-(METHYLMERCAPTO)-3-METHYLPHENYL THIOPHOSPHATE
  • OMS 2
  • PHENTHION
  • PHOSPHOROTHIOIC ACID ((H3PO3S)), O,O-DIMETHYL O-4-(METHYLTHIO)-M-TOLYL ESTER
  • PHOSPHOROTHIOIC ACID, DIMETHYL [4-(METHYLTHIO)-M-TOLYL] ESTER
  • PHOSPHOROTHIOIC ACID, O,O-DIMETHYL O-[4-(METHYLTHIO)-M-TOLYL] ESTER
  • QUELETOX
  • S 1752
  • SPOTTON
  • SULFIDOPHOS
  • TALODEX
  • TIGUVON

Version 3.0.0