Tantalum

Formula
Ta
Structure
Description
Gray metal. Odorless.
Uses
In rectifiers, esp for railway signals, in electrolysis capacitors, in manufacture of radio & power tubes.

Registry Numbers and Inventories.
CAS
7440-25-7
EC (EINECS/ELINCS)
231-135-5
RTECS
WW5505000
RTECS class
Tumorigen
UN (DOT)
3089
Merck
12,9223
Beilstein/Gmelin
16312 (G)
Swiss Giftliste 1
G-4652
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
Ta
Formula mass
180.94
Melting point, °C
2996
Boiling point, °C
5427
Density
16.69 g/cm3 (20 C)
Solubility in water
Insoluble
Thermal expansion
6.55E-06/K
Heat of fusion
33.7 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
ELIMINATE all ignition sources. Do not touch or walk through spilled material. Stop leak if you can do it without risk.
Stability
Powder ignites SPONTANEOUSLY in air.
Incompatibilities
Keep away from strong oxidizers, bromine tri fluoride and fluorine.

Fire.
Fire fighting
DO NOT USE WATER, FOAM OR carbon dioxide. Dousing metallic fires with water may generate hydrogen gas, an extremely dangerous explosion hazard, particularly if fire is in a confined environment. Use DRY sand, graphite powder, dry sodium chloride based extinguishers, G-1 or Met-L-X powder. Confining and smothering metal fires is preferable rather than applying water.
Hazards
Oxides from metallic fires are a severe health hazard. Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
NIOSH REL: TWA 5 mg/m3 ST 10 mg/m3 OSHA PEL: TWA 5 mg/m3 IDLH 2500 mg/m3 (as Ta)
Poison_Class
-
Exposure effects
   Ingestion
See Inhalation.
   Inhalation
Substance or decomposition products may cause severe injury or death.
   Skin
See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation. Activated charcoal activated charcoal binds most toxic agents and can decrease their systemic absorption if administered soon after ingestion. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
3089
Response guide
Hazard class
4.1
Packing Group
II; III