Yttrium

Synonyms & Trade Names
Yttrium metal
CAS No.
7440-65-5
RTECS No.
DOT ID & Guide
Formula
Y
Conversion
IDLH
500 mg/m3 (as Y)
See: 7440655
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).]
Measurement Methods
NIOSH 7300 , 7301 , 7303 , 9102;
OSHA ID121
See: NMAM or OSHA Methods
Physical Description
Dark-gray to black, odorless solid.
Molecular Weight
88.9
Boiling Point
5301°F
Melting Point
2732°F
Solubility
Soluble in hot H2O
Vapor Pressure
0 mmHg (approx)
Ionization Potential
NA
Specific Gravity
4.47
Flash Point
NA
Upper Exposive Limit
NA
Lower Explosive Limit
NA
Noncombustible Solid in bulk form.
Incompatibilities & Reactivities
Oxidizers
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
Personal Protection/Sanitation
(See protection codes)
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 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

Important additional information about respirator selection

See also
Page last reviewed: October 17, 2018