Barium
Also known as bario, baryum, Barium, elemental
Key facts
What buyers check first
- Appearance
- Silvery-white, slightly lustrous, body-centered cubic structure
- Melting point
- 727 °C
- Boiling point
- 1,897 °C
- Density
- 3.62 g/cm³
- Solubility
- Reacts with water, slightly soluble in ethanol
- HS code
- 280519
- Category
- Metals, alloys and elements
- UN number
- UN 1400
What is Barium?
Plain description, key identifiers and synonyms
Barium(0) is an elemental barium.
Barium is a chemical element with symbol Ba and atomic number 56.
Identifiers
Registry numbers, names and line notations, tap to copy
- IUPAC name
- barium
- CAS number
- 7440-39-3 CAS number cross-checked
- EC number
- 231-149-1
- Molecular formula
- Ba
- UNII
- 24GP945V5T
- MDL number
- MFCD00134031
- InChIKey
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N
- InChI
- InChI=1S/Ba
- SMILES (canonical and isomeric)
- [Ba]
Synonyms
- bario
- baryum
- Barium, elemental
- BA
- barium(II) cation
- barium(2+) ion
- Barium metal
- barium atom
- barium(0)
- Bario, Baryum
- Barium Standard: Ba @ 10 microg/mL in 2% HNO3
- Barium Standard: Ba+2 @ 1000 microg/mL in H2O
- Barium Standard: Ba @ 1000 microg/mL in 5% HNO3
- Barium Standard: Ba @ 10000 microg/mL in 5% HNO3
- Barium AA Standard: Ba @ 1000 microg/mL in 5% HNO3
- Barium Standard: Ba @ 1000 microg/g in Hydrocarbon Oil
- Barium Standard: Ba @ 5000 microg/g in Hydrocarbon Oil
- Barium element
- Barium pieces
- Element Barium
- Element:Barium
- Atomic Barium
- Barium rod
- Element-Ba
- Element:Ba
Show all 34 synonymsShow fewer synonyms
- Barium (atomic)
- Barium (element)
- Ba (element)
- Ba Standard Solution
- 56Ba
- Barium 137
- Ba(0)
- Barium, 99%
- Barium pieces (dendritic), 3N
Physical and chemical properties
Measured values and descriptors computed from the structure
Physical and chemical properties
Measured values, check the supplier specification for your grade
| Appearance | Silvery-white, slightly lustrous, body-centered cubic structureexp.Measured value |
|---|---|
| Melting point | 727 °Cexp.Measured value |
| Boiling point | 1,897 °Cexp.Measured value |
| Density | 3.62 g/cm³exp.Measured value |
| Solubility | Reacts with water, slightly soluble in ethanolexp.Measured value |
| Vapour pressure | 1 Pa, 638 °C, 10 Pa, 765 °C, 100 Pa, 912 °C, 1 kPa, 1115 °C, 10 kPa, 1413 °C, 100 kPa, 1897 °Cexp.Measured value |
Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.
Computed descriptors
Calculated from the structure, useful for screening and formulation
| Molecular weight | 137.33 g/molcalc.Computed value |
|---|---|
| Exact mass | 137.9052 Dacalc.Computed value |
| LogP (octanol/water) | -0.38calc.Computed value |
| Topological polar surface area | 0 Ųcalc.Computed value |
| Hydrogen bond donors | 0calc.Computed value |
| Hydrogen bond acceptors | 0calc.Computed value |
| Rotatable bonds | 0calc.Computed value |
| Heavy atoms | 1calc.Computed value |
| Rings | 0calc.Computed value |
| Aromatic rings | 0calc.Computed value |
| Fraction sp3 carbons | 0calc.Computed value |
| Formal charge | 0calc.Computed value |
| Stereocentres | 0calc.Computed value |
Calculated for screening. Confirm critical figures with the supplier.
Safety and hazards
GHS classification summary, not a safety data sheet
Hazard statements
- H228Flammable solid.
- H260In contact with water releases flammable gases which may ignite spontaneously.
- H261In contact with water releases flammable gas.
- H301Toxic if swallowed.
- H314Causes severe skin burns and eye damage.
- H315Causes skin irritation.
- H318Causes serious eye damage.
- H319Causes serious eye irritation.
- H335May cause respiratory irritation.
Precautionary statements (34)
- P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
- P223Do not allow contact with water.
- P231 + P232Handle and store contents under inert gas. Protect from moisture.
- P240Ground and bond container and receiving equipment.
- P241Use explosion-proof electrical, ventilating and lighting equipment.
- P260Do not breathe dust, fume, gas, mist, vapours or spray.
- P261Avoid breathing dust, fume, gas, mist, vapours or spray.
- P264Wash skin thoroughly after handling.
- P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
- P270Do not eat, drink or smoke when using this product.
- P271Use only outdoors or in a well-ventilated area.
- P280Wear protective gloves, protective clothing, eye protection and face protection.
- P301 + P316If swallowed: Get emergency medical help immediately.
- P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
- P302 + P335 + P334If on skin: Brush off loose particles from skin. Immerse in cool water or wrap in wet bandages.
- P302 + P352If on skin: Wash with plenty of water.
- P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
- P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
- P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
- P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
- P316Get emergency medical help immediately.
- P317Get medical help.
- P319Get medical help if you feel unwell.
- P321Specific treatment (see supplemental first aid instructions on the label).
- P330Rinse mouth.
- P332 + P317If skin irritation occurs: Get medical help.
- P337 + P317If eye irritation persists: Get medical help.
- P362 + P364Take off contaminated clothing. And wash it before reuse.
- P363Wash contaminated clothing before reuse.
- P370 + P378In case of fire: Use appropriate media to extinguish.
- P402 + P404Store in a dry place. Store in a closed container.
- P403 + P233Store in a well-ventilated place. Keep container tightly closed.
- P405Store locked up.
- P501Dispose of contents and container in accordance with local regulations.
- UN number
- UN 1400
- Transport hazard class
- 4.3
- Packing group
- II
GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.
Full safety data and first aidBarium suppliers
Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings
- India, GurugramUnclaimed profileBariumGrade, purity and minimum order on requestPrice on request
- United KingdomUnclaimed profileBarium MetalGrade, purity and minimum order on requestPrice on request
- China, Changsha ManufacturerUnclaimed profileBarium MetalGrade, purity and minimum order on requestPrice on request
- Italy, Genova ManufacturerUnclaimed profileBarioGrade, purity and minimum order on requestPrice on request
- Price on request
- United States, Urbana ManufacturerUnclaimed profileBariumGrade, purity and minimum order on requestPrice on request
- Malaysia, SkudaiUnclaimed profileBarium MetalGrade, purity and minimum order on requestPrice on request
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Where suppliers are based
38 suppliers in 12 countries
- United States17
- China4
- Germany4
- Spain2
- United Kingdom2
- Turkey2
- and 6 more countries
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Barium price
Indicative price range per kg from live supplier offers
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Uses and applications
What the substance is used for, by industry and function
Carrier for radium, deoxidizer for steel and other metals, alloys of barium with aluminum or magnesium are used as getters in vacuum systems and electronic tubes, emissions from (140)Ba contribute to fission products of uranium rods, emissions from (133)Ba and (137m)Ba are used as std in gamma-spectrometry.
Deoxidizer for copper, Fray's metal, lubricant for anode rotors in X-ray tubes, spark-plug alloys.
Used as a component in various proprietary nodularizing and deoxidizing alloys.
Used extensively in manufacture of alloys for such products as nickel barium parts used in ignition equipment for automobiles and in manufacture of lithopone, glass, ceramics, and television picture tubes.
Substance listed with specific concentration in tattoo ink and/or permanent make up according to EU Commission Regulation 2020/2081. The concentration limit (by weight) is 0.05%.
Industrial uses: Intermediate, Alloys.
Consumer uses: Alloys, Intermediate.
Use classes: Inorganic substances.
Functional uses
- Insulators
- Surface modifier
- Wetting agent (non-aqueous)
Pharmacology
Barium is a naturally occurring alkaline metalloid element with atomic symbol Ba, atomic number 56, and atomic weight 137 that is only found in combination with other elements, typically barite (barium sulfate) and witherite (barium carbonate), or chemicals. Barium is used in many industrial processes, as well as in diagnostic testing, fireworks, and pesticides. It is characterized as a silvery white or yellow to white metallic solid that is odorless. Exposure occurs by inhalation, ingestion, or contact.
How it is made
Can be extracted by heating barium oxides with aluminum in vacuo at about 1200 °C & condensing barium vapor in the cool end of tube, or with ferrosilicon at temp about 50 °C higher. Lead-barium-calcium alloys can be prepd by electrolysis of fused chlorides in cell with molten lead as the cathode.
Barium is prepared commercially by the thermal reduction of barium oxide with aluminum.
To obtain the pure metal, barium oxide as starting material is reduced with ... silicon under vacuum at 1050 °C. The barium obtained (96-98.5%) is purified by vacuum distillation (99.5%).
Regulatory status
Inventories, regulations and trade controls that list this substance
United States
- TSCA inventory (USA)Status: Active in US commerce
HS code and trade data
Customs classification and reported world trade statistics
Global trade
World import and export statistics for the HS code Barium is traded under.
Alkali or alkaline-earth metals, other
- Germany59.4%
- United States7.9%
- France * partner reported4.7%
* Partner reported figures, a lower bound.
The HS code shown for Barium is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.
Frequently asked questions
Quick answers about Barium, based on the data on this page
What is Barium?
What is the CAS number of Barium?
What is the molecular formula and weight of Barium?
What is Barium used for?
Is Barium hazardous?
What is the HS code of Barium?
Where can I buy Barium?
Where can I buy Barium in India?
What is the price of Barium?
Guides for buyers
Practical guides that help when you source, ship or handle Barium
- Guide, SafetyHow to read a safety data sheet in 10 minutesA section by section method to pull the essentials out of any 16 section SDS: identity, hazards, composition, storage, PPE, properties, transport and emergency measures.Read
- Guide, Trade and logisticsShipping dangerous goods: UN numbers, classes and packing groupsHow the UN dangerous goods system works for chemicals, from the nine classes and UN numbers to packing groups, UN packaging marks, labels, documents and segregation.Read
- Guide, SafetyGHS pictograms, signal words and hazard statements explainedA practical guide to the nine GHS pictograms, the signal words Danger and Warning, H and P statements, and how to read a chemical label in seconds.Read
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