NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Methomyl

CAS
16752-77-5

CH3C(SCH3)NOC(O)NHCH3

RTECS
AK2975000
Synonyms & Trade Names

Lannate®; Methyl N-((methylamino)carbonyl)oxy)ethanimidothioate; S-Methyl-N-(methylcarbamoyloxy)thioacetimidate
DOT ID & Guide
2757 / 151 (carbamate pesticide, solid, toxic)

Exposure
Limits

NIOSH REL: TWA 2.5 mg/m3
OSHA PEL: none
IDLH
N.D. See: IDLH INDEX
Conversion
Physical Description
White, crystalline solid with a slight, sulfur-like odor. [insecticide]
MW: 162.2
BP: ?
MLT: 172°F
Sol(77°F): 6%
VP(77°F): 0.00005 mmHg
IP: ?

Sp.Gr(75°F): 1.29
Fl.P: NA
UEL: NA
LEL: NA

Noncombustible Solid, but may be dissolved in flammable liquids.
Incompatibilities & Reactivities

Strong bases
Measurement Methods
NIOSH 5601
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Quick drench
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Not available.
Important additional information about respirator selection
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes; blurred vision, miosis; salivation; abdominal cramps, nausea, vomiting; dyspnea (breathing difficulty); lassitude (weakness, exhaustion), muscle twitching; liver, kidney damage
Target Organs
Eyes, respiratory system, central nervous system, cardiovascular system, liver, kidneys, blood cholinesterase
See also: INTRODUCTION   See ICSC CARD: 0177