MERCAPTODIMETHUR

White crystalline powder with a mild odor. Used as an insecticide and immobilizing agent for birds, acaricide and molluscicide. (EPA, 1998)

none

No rapid reaction with air. No rapid reaction with water.

When heated to decomposition, it emits very toxic fumes of nitrogen and sulfur oxides. (EPA, 1998)

As a carbamate insecticide, this compound is a reversible cholinesterase inhibitor and acts on the nervous system. It is classified as very toxic, and the probable oral lethal dose for humans is 50-500 mg/kg or between 1 teaspoon and 1 ounce for a 150 lb. adult. (EPA, 1998)

MERCAPTODIMETHUR is a carbamate ester. Carbamates are chemically similar to, but more reactive than amides. Like amides they form polymers such as polyurethane resins. Carbamates are incompatible with strong acids and bases, and especially incompatible with strong reducing agents such as hydrides. Flammable gaseous hydrogen is produced by the combination of active metals or nitrides with carbamates. Strongly oxidizing acids, peroxides, and hydroperoxides are incompatible with carbamates.

• Carbamates
• Ethers

No information available.

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

FIRE: If tank, rail tank car or highway tank 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, 2024)

This compound is a solid carbamate insecticide.

Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Wear positive pressure breathing apparatus and special protective clothing. Remove and isolate contaminated clothing at the site. Move container from fire area if you can do it without risk. Fight fire from maximum distance. Dike fire control water for later disposal; do not scatter the material.

This compound is a carbamate insecticide.

Extinguish with dry chemical, carbon dioxide, water spray, fog, or foam. (EPA, 1998)

Avoid inhalation of material. This compound is a solid carbamate insecticide. Do not touch spilled material; stop leak if you can do so without risk. Use water spray to reduce vapors.

Small spills: absorb with sand or other noncombustible absorbent material and place into containers for later disposal.

Small dry spills: With clean shovel, place material into clean, dry container and cover; move containers from spill area.

Large spills: Dike far ahead of spill for later disposal. Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Remove and isolate contaminated clothing at the site. In case of contact with material, immediately flush skin or eyes with running water for at least 15 minutes. (EPA, 1998)

For emergency situations, wear a positive pressure, pressure-demand, full facepiece self-contained breathing apparatus (SCBA) or pressure- demand supplied air respirator with escape SCBA and a fully-encapsulating, chemical resistant suit. (EPA, 1998)

No information available.

Note: Methiocarb is a cholinesterase inhibitor.

Signs and Symptoms of Methiocarb Exposure: Acute exposure to methiocarb usually leads to a cholinergic crisis. Signs and symptoms may include increased salivation, profuse sweating, lacrimation (tearing), spontaneous defecation, and spontaneous urination. Pinpoint pupils, blurred vision, headache, tremors, muscle twitching, slight paralysis, and loss of muscle coordination may occur. Malaise, mental confusion, convulsions, unconsciousness, and coma may also be noted. Gastrointestinal effects include nausea, vomiting, diarrhea, and abdominal pain. Bradycardia (slow heart rate) occurs frequently. Pulmonary edema, dyspnea (shortness of breath), labored breathing, respiratory depression, or respiratory arrest may also occur.

Emergency Life-Support Procedures: Acute exposure to methiocarb exposure may require decontamination and life support for the victims. Emergency personnel should wear protective clothing appropriate to the type and degree of contamination. Air-purifying or supplied-air respiratory equipment should also be worn, as necessary. Rescue vehicles should carry supplies such as plastic sheeting and disposable plastic bags to assist in preventing spread of contamination.

Inhalation Exposure:
1. Move victims to fresh air. Emergency personnel should avoid self-exposure to methiocarb.
2. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
3. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
4. Transport to a health care facility.

Dermal/Eye Exposure:
1. Remove victims from exposure. Emergency personnel should avoid self-exposure to methiocarb.
2. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
3. Remove contaminated clothing as soon as possible.
4. If eye exposure has occurred, eyes must be flushed with lukewarm water for at least 15 minutes.
5. Wash exposed skin areas three times with soap and water.
6. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
7. Transport to a health care facility.

Ingestion Exposure:
1. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
2. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
3. Vomiting may be induced with syrup of Ipecac. If elapsed time since ingestion of methiocarb is unknown or suspected to be greater than 30 minutes, do not induce vomiting and proceed to Step
4.Ipecac should not be administered to children under 6 months of age.Warning: Ingestion of methiocarb may result in sudden onset of seizures or loss of consciousness. Syrup of Ipecac should be administered only if victims are alert, have an active gag-reflex, and show no signs of impending seizure or coma. If ANY uncertainty exists, proceed to Step
4.The following dosages of Ipecac are recommended: children up to 1 year old, 10 mL (1/3 oz); children 1 to 12 years old, 15 mL (1/2 oz); adults, 30 mL (1 oz). Ambulate (walk) the victims and give large quantities of water. If vomiting has not occurred after 15 minutes, Ipecac may be readministered. Continue to ambulate and give water to the victims. If vomiting has not occurred within 15 minutes after second administration of Ipecac, administer activated charcoal.
4. Activated charcoal may be administered if victims are conscious and alert. Use 15 to 30 g (1/2 to 1 oz) for children, 50 to 100 g (1-3/4 to 3-1/2 oz) for adults, with 125 to 250 mL (1/2 to 1 cup) of water.
5. Promote excretion by administering a saline cathartic or sorbitol to conscious and alert victims. Children require 15 to 30 g (1/2 to 1 oz) of cathartic; 50 to 100 g (1-3/4 to 3- 1/2 oz) is recommended for adults.
6. Transport to a health care facility. (EPA, 1998)

• B 37344
• BAY 37344
• BAY 5024
• BAY 9026
• BAYER 37344
• CARBAMIC ACID, METHYL-, 3,5-DIMETHYL-4-(METHYLTHIO)PHENYL ESTER
• CARBAMIC ACID, METHYL-, 4-(METHYLTHIO)-3,5-XYLYL ESTER
• CARBAMIC ACID, METHYL-,4-(ETHYLTHIO)-3,5-XYLYL ESTER
• DCR 736
• 3,5-DIMETHYL- 4-(METHYLTHIO)PHENYL METHYLCARBAMATE
• 3,5-DIMETHYL-4-(METHYLTHIO)PHENOL METHYLCARBAMATE
• 3,5-DIMETHYL-4-(METHYLTHIO)PHENYL METHYLCARBAMATE
• 3-5-DIMETHYL-4-METHYLMERCAPTOPHENYL-N- METHYLCARBAMATE
• 3,5-DIMETHYL-4-METHYLTHIOPHENYL N-METHYLCARBAMATE
• DRAZA
• ENT 25,726
• H 321
• MERCAPTODIMETHUR
• MESUROL
• MESUROL 50
• MESUROL PHENOL
• METHIOCARB
• METHMERCAPTURON
• METHYL CARBAMIC ACID 4-(METHYLTHIO)-3,5-XYLYL ESTER
• 4-METHYLMERCAPTO-3,5-DIMETHYLPHENYL N-METHYLCARBAMATE
• 4-METHYLMERCAPTO-3,5-XYLYL METHYLCARBAMATE
• 4-(METHYLTHIO)-3,5-XYLYL METHYLCARBAMATE
• 4-METHYLTHIO-3,5-DIMETHYLPHENYL METHYLCARBAMATE
• METMERCAPTURON
• OMS-93
• PHENOL, 3,5-DIMETHYL-4-(METHYLTHIO)-, METHYLCARBAMATE
• SD 9228
• 3,5-XYLENOL, 4-(METHYLTHIO)-, METHYLCARBAMATE