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TANTALUM
(powder)
ICSC: 1596
Peer-Review Status: 20.10.2005 Validated
 
CAS #: 7440-25-7 RTECS #: WW5505000
UN #: 3089
EINECS #: 231-135-5
    Formula: Ta
Atomic mass: 180.9

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible. May ignite spontaneously on contact with air.  NO open flames, NO sparks and NO smoking.  Use dry powder, dry sand, special powder. NO carbon dioxide, foam, water. 
EXPLOSION Finely dispersed particles form explosive mixtures in air.  Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent deposition of dust.  In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water. 
 
EXPOSURE   PREVENT DISPERSION OF DUST!   
Inhalation Cough.  Avoid inhalation of dust.  Fresh air, rest. 
Skin   Protective gloves.  Remove contaminated clothes. Rinse and then wash skin with water and soap. 
Eyes Redness.  Wear safety spectacles.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion   Do not eat, drink, or smoke during work.  Rinse mouth. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Remove all ignition sources. Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Cover the spilled material with dry inert absorbent. Vacuum spilled material with specialist equipment. Then store and dispose of according to local regulations.  Airtight. 
EC Classification
 
UN Classification
UN Hazard Class: 4.1; UN Pack Group: II 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-41GF3-II+III.
NFPA Code: H1; F3; R1. 
Fireproof. Separated from strong oxidants and halogens. 

IMPORTANT DATA
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. This generates fire and explosion hazard. 

Occupational exposure limits
TLV: 5mg/m³ as TWA; (ACGIH 2005).
MAK (inhalable fraction): 4 mg/m³; (DFG 2005).
MAK (respirable fraction): 1.5 mg/m³; (DFG 2005). 

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
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 5425°C
Melting point: 2996°C
Density: 14.5 g/cm³
Solubility in water: none
Flash point: >250°C 
 

NOTES
Combustion in a confined space may turn into detonation. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations