# NIOSH Pocket Guide to Chemical Hazards
Naphthalene diisocyanate | CAS 3173-72-6
C10H6(NCO)2 | RTECS NQ9600000
Synonyms & Trade Names 1,5-Diisocyanatonaphthalene; 1,5-Naphthalene diisocyanate; 1,5-Naphthalene ester of isocyanic acid; NDI | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 0.040 mg/m3 (0.005 ppm) C 0.170 mg/m3 (0.020 ppm) [10-minute]
OSHA PEL: none
IDLH N.D. | Conversion 1 ppm = 8.60 mg/m3
Physical Description White to light-yellow, crystalline flakes.
MW: 210.2 | BP: 505°F | MLT: 261°F | Sol: ?
VP(75°F): 0.003 mmHg | IP: ? |  | Sp.Gr: ?
Fl.P(oc): 311°F | UEL: ? | LEL: ? |
Combustible Solid
Incompatibilities & Reactivities None reported
Measurement Methods OSHA PV2046
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: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH Up to 0.05 ppm: (APF = 10) Any supplied-air respirator* Up to 0.125 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode* Up to 0.25 ppm: (APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 1 ppm: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode 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/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, nose, throat; respiratory sensitization, cough, pulmonary secretions, chest pain, dyspnea (breathing difficulty); asthma
Target Organs Eyes, respiratory system
See also: INTRODUCTION