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Tantalum (metal and oxide dust, as Ta)

Synonyms & Trade Names
Tantalum-181, Tantalum metal
CAS No.
7440-25-7 (metal)
RTECS No.
WW5505000 (metal)
DOT ID & Guide
Formula
Ta (metal)
Conversion
IDLH
2500 mg/m3 (as Ta)
See: 7440257
Exposure Limits
NIOSH REL
TWA 5 mg/m3 ST 10 mg/m3
OSHA PEL
TWA 5 mg/m3
Measurement Methods
NIOSH 0500
See: NMAM or OSHA Methods
Physical Description
Metal: Steel-blue to gray solid or black, odorless powder.
Molecular Weight
180.9
Boiling Point
9797°F
Melting Point
5425°F
Solubility
Insoluble
Vapor Pressure
0 mmHg (approx)
Ionization Potential
NA
Specific Gravity
16.65 (metal) 14.40 (powder)
Flash Point
NA
Upper Exposive Limit
NA
Lower Explosive Limit
NA
Minimum Explosive Concentration
<200 g/m3
Metal: Combustible Solid; powder ignites SPONTANEOUSLY in air.
Incompatibilities & Reactivities
Strong oxidizers, bromine trifluoride, fluorine
Exposure Routes
inhalation, skin and/or eye contact
Symptoms
irritation eyes, skin; In Animals: pulmonary irritation
Target Organs
Eyes, skin, respiratory system
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

Breathing:Respiratory support
Respirator Recommendations

NIOSH/OSHA

Up to 25 mg/m3:
(APF = 5) Any quarter-mask respirator.
Click here for information on selection of N, R, or P filters.

Up to 50 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 125 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 250 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 2500 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
INTRODUCTION   ICSC CARD: 1596

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