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Mevinphos - Chemical Identity 10/85

INTERIM
Date: October 31, 1985
Revision:

CHEMICAL IDENTITY -- MEVINPHOS
CAS Registry Number: 7786-34-7

Synonyms:  Crotonic Acid, 3-Hydroxy-, Methyl Ester, Dimethyl Phosphate,
(E)-; Apavinphos; l-Methoxycarbonyl-l-propen-2-yl Dimethyl Phosphate;
2-Butenoic Acid, 3-((Dimethoxyphosphinyl)oxy)-, Methyl Ester; 2-
Carbomethoxy-l-Methylvinyl Dimethyl Phosphate; l-Carbomethoxy-l-Propen-
2-yl Dimethyl Phosphate; 2-Methoxycarbonyl-l-Methylvinyl Dimethyl
Phosphate; 3-Hydroxycrotonic Acid Methyl Ester Dimethyl Phosphate; 3-
[(Dimethoxyphosphinyl)oxy]-2-Butenoic Acid Methyl Ester; Alpha-2-
Carbomethoxy-l-Methylvinyl Dimethyl Phosphate; Cis-2-Methoxycarbonyl-l-
Methylvinyl Dimethylphosphate; Cis-Phosdrin; CMDP; Compound 2046;
Crotonic Acid, 3-Hydroxy-, Methyl Ester, Dimethyl Phosphate; Dimethyl
(l-Methoxycarboxypropen-2-yl) Phosphate; Dimethyl 2-Methoxycarbonyl-
l-Methylvinyl Phosphate; Dimethyl Methoxycarbonylpropenyl Phosphate;
Dimethyl Phosphate of Methyl 3-Hydroxy-cis-Crotonate; Dimethyl-l-
Carbomethoxy-l-Propen-2-yl Phosphate; Duraphos; ENT 22,374; ENT 22374;
Fosdrin; Gesfid; Gestid; Meniphos; Menite; Methyl 3-
(Dimethoxyphosphinyloxy) Crotonate; O,O-Dimethyl l-Carbomethoxy-l-
Propen-2-yl Phosphate; O,O-Dimethyl O    Methyl-2-Carboxyvinyl)
Phosphate; 05-2046; PD S; Phosdrin; Phosfene; Phosphoric Acid, (l-
Methoxycarboxypropen-2-yl) Dimethyl Ester; Phosphoric Acid, Dimethyl
Ester, Ester With Methyl 3-Hydroxycrotonate

Chemical Formula: C7Hl306P

Molecular Weight: 224.17

SECTION I -- HAZARDOUS INGREDIENTS/IDENTITY INFORMATION

   OSHA PEL:  O .l mg/m(3) (NIOSH/OSHA 1978, p . 154)

   ACGIH TLV:  TWA 0.01 ppm, 0.1 mg/m(3); STEL 0.03 ppm, 0.3 mg/m(3)
   (skin) (*ACGIH 1983)

   IDLH:  40 mg/m(3) (NIOSH/OSHA 1978, p. 154)
   Other Limits Recommended:  Not Found

SECTION II -- PHYSICAL/CHEMICAL CHARACTERISTICS

   Boiling Point:  223-226 degrees F, 106-107.5 degrees C at 1 mmHg
   (*Merck 1983)
   Specific Gravity (H20=1):  1. 25 at 20 degrees C (*Merck 1983)
   Vapor Pressure (mmHg):  O . 0029 at 70 degrees F (*Spencer 1982)
   Melting Point:  cis isomer 70 degrees F, 21 degrees C; trans isomer
   44.4 degrees F, 6.9 degrees C (Hayes 1982, p. 356; *Worthing 1979)

   Vapor Density (AIR=l):  Not Found
   Evaporation Rate (Butyl acetate=l):  Not Found
   Solubility in Water:  Miscible (*Merck 1983)
   Appearance and Odor:  Pale yellow to orange liquid (*Spencer 1982),
   with a weak odor (NIOSH/OSHA 1978, p. 154)

SECTION III -- FIRE AND EXPLOSION HAZARD DATA

   Flash Point (Method Used):  175 degrees F (OC) (*Clayton and Clayton
   1981-82)
   Flammable Limits:
      LEL: Not Found
      UEL: Not Found

   Extinguishing Methods:  Small fires:  use dry chemical, carbon
   dioxide, water spray or foam.  Large fires:  use water spray, fog or
   foam.  Fight  fire from maximum distance.  Dike fire control water
   for later disposal (*DOT 1984).

   Special Fire Fighting Procedures:  Isolate hazard area, stay upwind;
   ventilate closed spaces before entering, wear protective clothing and
   positive breathing apparatus.  Remove and isolate contaminated
   clothing (*DOT 1984).

   Unusual Fire and Explosion Hazards:  Fire may produce irritating or
   poisonous gases.  Runoff from fire control may give off poisonous
   gases and also cause pollution (*DOT 1984).

SECTION IV -- REACTIVITY DATA

   Stability: Unstable:
              Stable:  Yes (*Spencer 1982)

   Conditions to Avoid:  Temperatures above 25-30 degrees C, sources
   of heat, fire, free flames or spark-generating equipment (*Farm
   Chemicals Handbook, 1984)

   Incompatibility (Materials to Avoid):  Strong oxidizers (*NIOSH/OSHA
   1978)

   Hazardous Decomposition or Byproducts:  When heated to decomposition,
   it emits toxic fumes of phosphorus oxides (Sax 1984, p. 639)

   Hazardous Polymerization:  May Occur:  Not Found
                          May Not Occur:  Not Found

       Conditions to Avoid:  Not Found

SECTION V -- HEALTH HAZARD DATA

   Routes of Entry:  Inhalation:  Yes (*Gosselin 1984)
                     Skin:  Yes (*Gosselin 1984)
                     Ingestion:  Yes (*Gosselin 1984)

   Health Hazards (Acute, Delayed, and Chronic):  This material is super
   toxic; the probable oral lethal dose for humans is less than 5 mg/kg,
   or a taste (less than 7 drops) for a 150-1b. person.  It has direct
   and immediate effects whether it is swallowed, inhaled, or absorbed
   through the skin (*Gosselin 1984).

   Signs and Symptoms of Exposure: Symptoms include nausea, vomiting,
   abdominal cramps, diarrhea, excessive salivation, headache,
   giddiness, dizziness, runny nose, tightness in the chest, blurring
   and dimming of vision, slurrying of speech, twitching of muscles,
   mental confusion, disorientation, difficulty breathing, bluing of
   skin, convulsions, coma, and death (*Gosselin 1984)

   Medical Conditions Generally Aggravated by Exposure:  Not Found

   Emergency and First Aid Procedures: Move victim to fresh air; call
   emergency medical care.  If not breathing, give artificial
   respiration.
   If breathing is difficult, give oxygen.  In case of contact with
   material, immediately flush skin or eyes with running water for at
   least 15 minutes.  Speed in removing material from skin is of extreme
   importance.  Remove and isolate contaminated clothing and shoes at
   the site.  Keep victim quiet and maintain normal body temperature.
   Effects may be delayed; keep victim under observation (DOT 1984,
   Guide 55).

SECTION VI -- USE INFORMATION

   Used as an insecticide and acaricide on vegetables, alfalfa,
   deciduous fruits and nuts (*SRI).

SECTION VII -- PRECAUTIONS FOR SAFE HANDLING AND USE

(Steps to be Taken in Case Material is Released or Spilled)

   Do not touch spilled material (see Section V, above).  In case of
   spills, stay upwind; keep out of low areas.  Ventilate closed areas
   before entering them.  Use water spray to reduce vapors.  Wear
   positive pressure breathing apparatus and special productive clothing
   (DOT 1984).  A respirator with an activated carbon gas filter
   cartridge may be used (Encyc Occupat Health and Safety 1983).