NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




Synonyms & Trade Names

alpha-Naphthyl N-methyl-carbamate; 1-Naphthyl N-Methyl-carbamate; Sevin®
DOT ID & Guide
2757 / 151


NIOSH REL: TWA 5 mg/m3
OSHA PEL: TWA 5 mg/m3
100 mg/m3 See: 63252
Physical Description
White or gray, odorless solid. [pesticide]
MW: 201.2
BP: Decomposes
MLT: 293°F
Sol: 0.01%
VP(77°F): <0.00004 mmHg
IP: ?

Sp.Gr: 1.23
Fl.P: NA

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

Strong oxidizers, strongly alkaline pesticides
Measurement Methods
NIOSH 5006, 5601; OSHA 63
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

First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Up to 50 mg/m3:
(APF = 10) Any supplied-air respirator*
Up to 100 mg/m3:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Miosis, blurred vision, tear; rhinorrhea (discharge of thin mucus), salivation; sweating; abdominal cramps, nausea, vomiting, diarrhea; tremor; cyanosis; convulsions; irritation skin; possible reproductive effects
Target Organs
respiratory system, central nervous system, cardiovascular system, skin, blood cholinesterase, reproductive system
See also: INTRODUCTION   See ICSC CARD: 0121   See MEDICAL TESTS: 0037