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DIMETHYL HYDROGEN PHOSPHITE

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
  • 96-36-6
  • 868-85-9
DOT Hazard Label USCG CHRIS Code
  • Poison
NIOSH Pocket Guide International Chem Safety Card
none
NFPA 704
data unavailable
General Description
Colorless liquid. (USCG, 1999)

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
  • Highly Flammable
Air & Water Reactions
Highly flammable. Water soluble. Slowly reacts with water.
Fire Hazard
Special Hazards of Combustion Products: Emits toxic fumes under fire conditions. (USCG, 1999)
Health Hazard
Harmful if swallowed, inhaled or absorbed through skin. Exposure can cause nausea, headache and vomiting. Vapor irritating to eyes, mucous membrane and upper respiratory tract. (USCG, 1999)
Reactivity Profile
DIMETHYL HYDROGEN PHOSPHITE may form highly toxic and flammable phosphine gas in the presence of strong reducing agents such as hydrides. 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 151 [Substances - Toxic (Non-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: See ERG Table 1 - Initial Isolation and Protective Action Distances on the UN/NA 3278 datasheet.

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
Fire Extinguishing Agents Not to Be Used: Water may be ineffective.

Fire Extinguishing Agents: Water fog, dry chemical, carbon dioxide, alcohol foam. (USCG, 1999)
Non-Fire Response
Neutralizing Agents for Acids and Caustics: Dry lime, soda ash (USCG, 1999)
Protective Clothing
Self-contained breathing apparatus, rubber boots and heavy rubber gloves (USCG, 1999)
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: DO NOT INDUCE VOMITING. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. Be prepared to transport the victim to a hospital if advised by a physician. If the victim is convulsing or unconscious, do not give anything by mouth, ensure 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.

OTHER: Since this chemical is a known or suspected carcinogen you should contact a physician for advice regarding the possible long term health effects and potential recommendation for medical monitoring. Recommendations from the physician will depend upon the specific compound, its chemical, physical and toxicity properties, the exposure level, length of exposure, and the route of exposure. (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.
Chemical Formula:
  • C2H7O3P
Flash Point: 85°F (NTP, 1992)
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature: data unavailable
Melting Point: data unavailable
Vapor Pressure: 1 mmHg at 77°F ; 8 mmHg at 122°F; 32 mmHg at 158°F (NTP, 1992)
Vapor Density (Relative to Air): data unavailable
Specific Gravity: 1.2 (USCG, 1999)
Boiling Point: 338 to 340°F at 760 mmHg (NTP, 1992)
Molecular Weight: 110.05 (NTP, 1992)
Water Solubility: greater than or equal to 100 mg/mL at 67.1°F (NTP, 1992)
Ionization Energy/Potential: data unavailable
IDLH: data unavailable

AEGLs (Acute Exposure Guideline Levels)

Interim AEGLs for Dimethyl Phosphite (868-85-9)
Exposure Period AEGL-1 AEGL-2 AEGL-3
10 minutes NR 120 ppm 190 ppm
30 minutes NR 120 ppm 190 ppm
60 minutes NR 95 ppm 150 ppm
4 hours NR 60 ppm 96 ppm
8 hours NR 39 ppm 63 ppm
NR = Not Recommended due to insufficient data.
(NAC/NRC, 2022)

ERPGs (Emergency Response Planning Guidelines)

No ERPG information available.

PACs (Protective Action Criteria)

Chemical PAC-1 PAC-2 PAC-3
Dimethyl phosphite (868-85-9) 8.6 mg/m3 95 mg/m3 150 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

No regulatory information available.

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.
  • DIMETHOXYPHOSPHINE OXIDE
  • DIMETHYL ACID PHOSPHITE
  • DIMETHYL HYDROGEN PHOSPHITE
  • DIMETHYL HYDROGEN PHOSPHONATE
  • DIMETHYL PHOSPHITE
  • DIMETHYL PHOSPHONATE
  • DIMETHYLHYDROGEN PHOSPHITE
  • DIMETHYLHYDROGENPHOSPHITE
  • DIMETHYLPHOSPHONATE
  • HYDROGEN DIMETHYL PHOSPHITE
  • METHYL PHOSPHONATE ((MEO)2HPO)
  • NCI-C54773
  • PHOSPHONIC ACID, DIMETHYL ESTER

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