# NIOSH Pocket Guide to Chemical Hazards
Indium | CAS 7440-74-6
In | RTECS NL1050000
Synonyms & Trade Names Indium metal | DOT ID & Guide
Exposure Limits | NIOSH REL*: TWA 0.1 mg/m3 [*Note: The REL also applies to other indium compounds (as In).]
OSHA PEL†: none
IDLH N.D. | Conversion
Physical Description Ductile, shiny, silver-white metal that is softer than lead.
MW: 114.8 | BP: 3767°F | MLT: 314°F | Sol: Insoluble
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 7.31
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Solid in bulk form, but may ignite in powdered or dust form.
Incompatibilities & Reactivities (Dinitrogen tetraoxide + acetonitrile), mercury(II) bromide (at 662°F), sulfur (mixtures ignite when heated) [Note: oxidizes readily at higher temperatures.]
Measurement Methods NIOSH P&CAM173 (II-5); OSHA ID121
Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash 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, skin, respiratory system; possible liver, kidney, heart, blood effects; pulmonary edema
Target Organs Eyes, skin, respiratory system, liver, kidneys, heart, blood
See also: INTRODUCTION