NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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) See: rhodium
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)
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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 quarter-mask respirator. Click here for information on selection of N, R, or P filters.
Up to 1 mg/m3:
(APF = 10) Any particulate respirator equipped with an N95, R95, or P95 filter (including N95, R95, and P95 filtering facepieces) except quarter-mask respirators. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.
(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 high-efficiency particulate filter.
Up to 5 mg/m3:
(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.
(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 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
Important additional information about respirator selection
Exposure Routes
inhalation
Symptoms
Possible respiratory sensitization
Target Organs
respiratory system
See also: INTRODUCTION   See ICSC CARD: 1247