Inorganic Acids & Bases
REACH
Barium hydroxide
CAS Number
17194-00-2
EC Number
241-234-5
What is Barium hydroxide?
Barium hydroxide (CAS 17194-00-2), also known as caustic baryta, is a strong inorganic base used in industrial processes requiring precise alkalinity control and barium ion delivery.
Where is Barium hydroxide used?
- Water treatment: precipitates sulfate and carbonate impurities from process streams
- Plastics and polymers: catalyst and stabilizer precursor in PVC formulations
- Mining and metals: conditions leach solutions and adjusts pH in barium-sensitive precipitation circuits
- Pulp and paper: causticizing steps and pH regulator in specialty chemical recovery
- It combines high basicity with reactivity toward sulfates and carbonates.
Good to know: Unlike general-purpose alkalis, it is chosen where sodium or calcium hydroxides are unsuitable.
Commercial specifications
- Packaging from 25 kg bags to bulk
- Purity commonly 95–99%
Other Names (Synonyms)
caustic baryta|barium hydroxide lime|Ba(OH)2|Barium dihydroxide|Aetzbaryt|Barium Hydroxide (Ba(OH)2)|barium(II) hydroxide|barium(2+) hydroxide
What are the physical properties of Barium hydroxide?
Melting Point 408 °C
Boiling Point decomposes at 1032 (calculated) [KNA91]
Density 2.18 g/cm³ (solid)
Appearance white crystalline powder
Color Clear
Odor no odor
Form Solid
Water Solubility Soluble in water.
pH 11.27(1 mM solution);12.22(10 mM solution);13.08(100 mM solution)
How is Barium hydroxide classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS06· Toxic GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H290 May be corrosive to metals
H301 Toxic if swallowed
H302 Harmful if swallowed
H314 Causes severe skin burns and eye damage
Precautionary Statements
P234 Keep only in original packaging.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to Barium hydroxide?
HS Code 2805191000
UN Number 3262
ADR Class 8
Packing Group II
Storage Class 8A - Combustible corrosive hazardous materials
WGK (Germany) 1