# NIOSH Pocket Guide to Chemical Hazards
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, n.o.s.)
Exposure Limits | NIOSH REL: TWA 2.5 mg/m3
OSHA PEL†: none
IDLH N.D. | 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
Personal Protection & Sanitation 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 To be added later
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