NIOSH Pocket Guide to Chemical Hazards

Yttrium CAS 7440-65-5
Y RTECS ZG2980000
Synonyms & Trade Names
Yttrium metal
DOT ID & Guide
Exposure
Limits
NIOSH REL*: TWA 1 mg/m3 [*Note: The REL also applies to other yttrium compounds (as Y).]
OSHA PEL*: TWA 1 mg/m3 [*Note: The PEL also applies to other yttrium compounds (as Y).]
IDLH 500 mg/m3 (as Y) Conversion
Physical Description
Dark-gray to black, odorless solid.
MW: 88.9
BP: 5301°F
MLT: 2732°F
Sol: Soluble in hot H2O
VP: 0 mmHg (approx)
IP: NA

Sp.Gr: 4.47
Fl.P: NA
UEL: NA
LEL: NA

Noncombustible Solid in bulk form.
Incompatibilities & Reactivities
Oxidizers
Measurement Methods
NIOSH 7300; 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 promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA
Up to 5 mg/m3: (APF = 5) Any dust and mist respirator
Up to 10 mg/m3: (APF = 10) Any dust and mist respirator except single-use and quarter-mask respirators/(APF = 10) Any supplied-air respirator
Up to 25 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(APF = 25) Any powered, air-purifying respirator with a dust and mist filter
Up to 50 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 500 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, ingestion, skin and/or eye contact
Symptoms Irritation eyes; in animals: pulmonary irritation; eye injury; possible liver damage
Target Organs Eyes, respiratory system, liver
See also: INTRODUCTION