NIOSH Pocket Guide to Chemical Hazards

Naphthalene CAS 91-20-3
C10H8 RTECS QJ0525000
Synonyms & Trade Names
Naphthalin, Tar camphor, White tar
DOT ID & Guide
1334 133 (crude or refined)
2304 133 (molten)
Exposure
Limits
NIOSH REL: TWA 10 ppm (50 mg/m3) ST 15 ppm (75 mg/m3)
OSHA PEL�: TWA 10 ppm (50 mg/m3)
IDLH 250 ppm Conversion 1 ppm = 5.24 mg/m3
Physical Description
Colorless to brown solid with an odor of mothballs. [Note: Shipped as a molten solid.]
MW: 128.2
BP: 424°F
MLT: 176°F
Sol: 0.003%
VP: 0.08 mmHg
IP: 8.12 eV

Sp.Gr: 1.15
Fl.P: 174°F
UEL: 5.9%
LEL: 0.9%

Combustible Solid, but will take some effort to ignite.
Incompatibilities & Reactivities
Strong oxidizers, chromic anhydride
Measurement Methods
NIOSH 1501; OSHA 35
Personal Protection & Sanitation
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: Molten flush immediately/solid-liquid soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA
Up to 100 ppm: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s) in combination with a dust and mist filter*/(APF = 10) Any supplied-air respirator*
Up to 250 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s) in combination with a high-efficiency particulate filter/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s) in combination with a dust and mist filter*/(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
Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes; headache, confusion, excitement, malaise (vague feeling of discomfort); nausea, vomiting, abdominal pain; irritation bladder; profuse sweating; jaundice; hematuria (blood in the urine), renal shutdown; dermatitis, optical neuritis, corneal damage
Target Organs Eyes, skin, blood, liver, kidneys, central nervous system
See also: INTRODUCTION