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Hydroxides and bases

Barium hydroxide

Also known as Barium dihydroxide, Caustic baryta, Bariumhydroxid

CAS 17194-00-2Formula H2BaO2Molar mass 171.34 g/molEC 241-234-5
GHS signal word: Danger. Pictograms: Corrosive, Acute toxicity (severe), Harmful or irritant 74 suppliers listed
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Barium hydroxide chemical structure, H2BaO2, CAS 17194-00-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White powder
Melting point
408 °C
Density
4.495
Solubility
4.91 g/100 g water at 25 °C
HS code
281640
Category
Hydroxides and bases
Illustrative photo, fine white powder in a white HDPE jar on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Barium hydroxide?

Plain description, key identifiers and synonyms

Barium dihydroxide is a barium hydroxide.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
barium(2+) dihydroxide
CAS number
17194-00-2 CAS number cross-checked
EC number
241-234-5
Molecular formula
H2BaO2
UNII
1OHB71MYBK
InChIKey
RQPZNWPYLFFXCP-UHFFFAOYSA-L
InChI
InChI=1S/Ba.2H2O/h;2*1H2/q+2;;/p-2
SMILES (canonical and isomeric)
[OH-].[OH-].[Ba+2]

Synonyms

  • Barium dihydroxide
  • Caustic baryta
  • Bariumhydroxid
  • Aetzbaryt
  • Barium Hydroxide (Ba(OH)2)
  • barium(II) hydroxide
  • barium(2+) hydroxide
  • Ba(OH)2
  • Barium hydroxide lime (USP)
  • barium(2+) ion dihydroxide
  • BaO2
  • barium (II) hydroxide
  • Barium hydroxide, anhydrous
  • Ba(OH)2.8H2O
  • Barium hydroxide lime
  • Barium hydroxide solution in water 0.15M +/- 0.02M (0.3N)

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
White powderexp.
Odour
Odorlessexp.
Melting point
408 °Cexp.
Density
4.495exp.
Solubility
4.91 g/100 g water at 25 °Cexp.
Vapour pressure
0.48 kPa at 17.6 °C, 1.32 kPa at 32.1 °C, 2.36 kPa at 40.7 °C, 5.08 kPa at 50.7 °C, 8.01 kPa at 57.8 °C, 12.56 kPa at 64.8 °C /Barium hydroxide, octahydrate/exp.

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
171.34 g/molcalc.
Exact mass
171.9107 Dacalc.
LogP (octanol/water)
-0.73calc.
Topological polar surface area
60 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H290May be corrosive to metals.
  • H301Toxic if swallowed.
  • H302 + H332Harmful if swallowed. Harmful if inhaled.
  • H302Harmful if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H318Causes serious eye damage.
  • H332Harmful if inhaled.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (24)
  • P234Keep only in original packaging.
  • 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.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P317If swallowed: Get medical help.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • 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 + 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.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P363Wash contaminated clothing before reuse.
  • P390Absorb spillage to prevent material damage.
  • P405Store locked up.
  • P406Store in a corrosion resistant container with a resistant inner liner.
  • P501Dispose of contents and container in accordance with local regulations.

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 aid

Barium hydroxide suppliers

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All 74 suppliers
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Where suppliers are based

74 suppliers in 18 countries

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Barium hydroxide 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

In manufacture of alkali, glass, in synthetic rubber vulcanization, in sugar industry, corrosion inhibitors, pesticides, boiler scale remedy, refining animal and vegetable oils, in softening water, as a catalyst in organic synthesis (Octahydrate).

Manufacturing of oil and grease additives, barium soaps, and chemicals. Refining of beet sugar, alkalizing agent in water softening, sulfate removal agent in treatment of water and brine, boiler scale removal, dehairing agent, catalyst in manufacture of phenol-formaldehyde resins, insecticide and fungicide, sulfate controlling agent in ceramics, purifying agent for caustic soda, steel carbonizing agent, glass, refining edible oils, elastomer vulcanization. (Barium hydroxide, monohydrate).

Organic preparations, barium salts, analytical chemistry. (Barium hydroxide, octahydrate and pentahydrate).

Agent to precipitate sugar from molasses, very small amounts as a chemical intermediate for other inorganic chemicals.

Industrial uses: Lubricating agent, Intermediate, Heat stabilizer.

Functional uses

  • Surface modifier

How it is made

/Barium hydroxide may be prepared/ (a) By dissolving barium oxide in water with subsequent crystallization, (b) By precipitation from an aqueous solution of the sulfide by caustic soda, (c) By heating barium sulfide in earthenware retorts into which a current of moist carbonic acid is passed, after which superheated steam is passed over the resulting heated carbonate. (Barium hydroxide octahydrate)

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 hydroxide is traded under.

HS 2816.40Indicative HS code

Oxides, hydroxides and peroxides, of strontium or barium

World exports in 2024
$33.7M
+8.5% vs 2023, imports $36.5M
2019 to 2024
Top exporters
  1. China77.5%
  2. Germany9.4%
  3. United States4.0%
Top importers
  1. South Korea25.4%
  2. Japan20.3%
  3. United States14.3%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Barium hydroxide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Barium hydroxide, based on the data on this page

What is Barium hydroxide?

Barium dihydroxide is a barium hydroxide.

What is the CAS number of Barium hydroxide?

The CAS registry number of Barium hydroxide is 17194-00-2.

What is the molecular formula and weight of Barium hydroxide?

The molecular formula of Barium hydroxide is H2BaO2 and its molar mass is 171.34 g/mol.

What is Barium hydroxide used for?

In manufacture of alkali, glass, in synthetic rubber vulcanization, in sugar industry, corrosion inhibitors, pesticides, boiler scale remedy, refining animal and vegetable oils, in softening water, as a catalyst in organic synthesis (Octahydrate). Manufacturing of oil and grease additives, barium soaps, and chemicals.

Is Barium hydroxide hazardous?

Barium hydroxide carries the GHS signal word "Danger". Main hazards: may be corrosive to metals, toxic if swallowed, harmful if swallowed. harmful if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Barium hydroxide?

Barium hydroxide is usually classified under HS code 281640 (Oxides, hydroxides and peroxides, of strontium or barium). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Barium hydroxide?

CompoundList lists 74 suppliers of Barium hydroxide in United States, India, China, Japan and 14 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Barium hydroxide in India?

16 suppliers in India list Barium hydroxide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Barium hydroxide?

Suppliers quote Barium hydroxide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Barium hydroxide

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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