# NIOSH Pocket Guide to Chemical Hazards
Rhodium (metal fume and insoluble compounds, as Rh) | CAS 7440-16-6 (metal)
Rh (metal) | RTECS VI9069000 (metal)
Synonyms & Trade Names Rhodium metal: Elemental rhodium Synonyms of other insoluble rhodium compounds vary depending upon the specific compound. | DOT ID & Guide
Exposure Limits | NIOSH REL: TWA 0.1 mg/m3
OSHA PEL: TWA 0.1 mg/m3
IDLH 100 mg/m3 (as Rh) | Conversion
Physical Description Metal: White, hard, ductile, malleable solid with a bluish-gray luster.
MW: 102.9 | BP: 6741°F | MLT: 3571°F | Sol: Insoluble
VP: 0 mmHg (approx) | IP: NA |  | Sp.Gr: 12.41 (metal)
Fl.P: NA | UEL: NA | LEL: NA |
Metal: Noncombustible Solid in bulk form, but flammable as dust or powder.
Incompatibilities & Reactivities Chlorine trifluoride, oxygen difluoride
Measurement Methods NIOSH S188 (II-3)
Personal Protection & Sanitation Skin: No recommendation Eyes: No recommendation Wash skin: No recommendation Remove: No recommendation Change: No recommendation | First Aid (See procedures) Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 0.5 mg/m3: (APF = 5) Any dust and mist respirator^ Up to 1 mg/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators^/(APF = 10) Any supplied-air respirator Up to 2.5 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 25) Any powered, air-purifying respirator with a dust, mist, and fume filter Up to 5 mg/m3: (APF = 50) Any air-purifying, full-facepiece respirator with a high-efficiency particulate filter/(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode/(APF = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and a high-efficiency particulate filter/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 100 mg/m3: (APF = 1000) Any supplied-air respirator 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 with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation
Symptoms Possible respiratory sensitization
Target Organs respiratory system
See also: INTRODUCTION