NIOSH Pocket Guide to Chemical Hazards


CAS 91-59-8


RTECS QM2100000
Synonyms & Trade Names
2-Aminonaphthalene, 2-Naphthylamine
DOT ID & Guide
1650 153


NIOSH REL: Ca See Appendix A
OSHA PEL: [1910.1009] See Appendix B
IDLH Ca [N.D.] See: IDLH INDEX Conversion
Physical Description
Odorless, white to red crystals with a faint, aromatic odor. [Note: Darkens in air to a reddish-purple color.]
MW: 143.2
BP: 583°F
MLT: 232°F
Sol: Miscible in hot water
VP(226°F): 1 mmHg
IP: 9.71 eV

Sp.Gr(208°F): 1.06
Fl.P: 315°F
UEL: ?
LEL: ?

Combustible Solid
Incompatibilities & Reactivities
None reported
Measurement Methods
NIOSH 5518; OSHA 93
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated/Daily
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations (See Appendix E) NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(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 with 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
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Dermatitis; hemorrhagic cystitis; dyspnea (breathing difficulty); ataxia; methemoglobinemia, hematuria (blood in the urine); dysuria; [potential occupational carcinogen]
Target Organs Bladder, skin

Cancer Site [bladder cancer]