# 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