Ta
Atomic mass: 180.9
(powder)
ICSC # 1596
CAS # 7440-25-7
RTECS # WW5505000
UN # 3089
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Combustible.
Dry tantalum powder may spontaneously ignite on contact with air.
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NO open flames, NO sparks, and NO smoking.
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Dry powder.
Dry sand.
Special powder.
NO carbon dioxide,foam,water.
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Explosion
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Finely dispersed particles form explosive mixtures in air.
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Prevent deposition of dust; closed system, dust explosion-proof electrical equipment and lighting.
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In case of fire: cool drums, etc., by spraying with water but avoid contact of the substance with water.
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Exposure
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PREVENT DISPERSION OF DUST!
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•Inhalation
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Cough.
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Avoid inhalation of dust.
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Fresh air, rest.
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•Skin
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Protective gloves.
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Remove contaminated clothes.
Rinse and then wash skin with water and soap.
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•Eyes
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Redness.
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Safety spectacles
.
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First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
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•Ingestion
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Do not eat, drink, or smoke during work.
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Rinse mouth.
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Spillage Disposal
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Storage
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Packaging & Labelling
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Remove all ignition sources.
Personal protection: P1 filter respirator for inert particles.
Cover the spilled material with inert absorbent.
Vacuum spilled material,
then remove to safe place.
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Fireproof.
Separated from
strong oxidants
and
halogens
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Airtight.
UN Hazard Class: 4.1
UN Packing Group: II
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Important Data
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Physical State; Appearance:
BLACK
SOLID IN VARIOUS FORMS
Physical Dangers:
Dust explosion possible if in powder or granular form, mixed with air.
Chemical Dangers:
Reacts
with
halogens
and
oxidants
causing fire and explosion hazard.
Occupational Exposure Limits:
TLV: 5 mg/m3 as TWA; (ACGIH 2005).
MAK: (Inhalable fraction) 4 mg/m3 (Respirable fraction) 1.5 mg/m3 (DFG 2005).
OSHA PEL: TWA 5 mg/m3
NIOSH REL: TWA 5 mg/m3 ST 10 mg/m3
NIOSH IDLH: 2500 mg/m3 (as Ta) See: IDLH INDEX
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Routes of Exposure:
Inhalation Risk:
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed.
Effects of Short-Term Exposure:
May cause mechanical irritation.
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Boiling point: 5425°C
Melting point: 2996°C
Density: 14.5
g/cm3
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Solubility in water:
none
Flash point: >250°C
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Environmental
Data
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N O T E S
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Combustion in a confined space may turn into detonation.
Transport Emergency Card: TEC (R)-41GF3-II+III
NFPA Code: H1; F3; R1;
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ADDITIONAL INFORMATION
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ICSC: 1596
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TANTALUM
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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