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) See: 7440655 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, 7301, 7303, 9102; OSHA ID121
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)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations NIOSH/OSHA
Up to 5 mg/m3:
(APF = 5) Any quarter-mask respirator. Click here for information on selection of N, R, or P filters.
Up to 10 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 25 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 50 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 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 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
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