Salts & Minerals
REACH
Sodium tetraborate pentahydrate
CAS Number
12179-04-3
EC Number
601-808-1
What is Sodium tetraborate pentahydrate?
Sodium tetraborate pentahydrate (CAS 12179-04-3), commercially known as borax pentahydrate, is an inorganic boron salt; a partially hydrated form of borax.
Where is Sodium tetraborate pentahydrate used?
- Detergents and industrial cleaning: boosts alkalinity and enhances surfactant performance for soil and grease removal
- Coatings and adhesives: crosslinking agent for PVA-based systems and corrosion inhibitor in metalworking fluids
- Flame-retardant treatments for cellulosic textiles, paper and wood: boron content meets fire-resistance specifications
- Water treatment: buffering agent that stabilizes process pH
- Agriculture: soluble boron source for micronutrient fertilizer blends
- It also functions as a pH buffer, corrosion inhibitor, biocide and flame retardant.
Commercial specifications
- 25 kg bags or bulk sacks
- Concentration typically expressed as percentage B₂O₃ content
Other Names (Synonyms)
borax pentahydrate|sodium borate pentahydrate|SG2N20S03U|Boron sodium oxide(B4Na2O7), pentahydrate|Boric acid(H2B4O7), disodium salt, pentahydrate|RefChem:887925|Boron sodium oxide (B4Na2O7), hydrate (1:5)|Disodium tetraborate pentahydrate
What are the physical properties of Sodium tetraborate pentahydrate?
Density 1.815
Appearance Borax is a noncombustible (an inherent fire retardant), bluish-gray or green, odorless crystalline powder or granules.
How is Sodium tetraborate pentahydrate classified and handled safely? Learn More
Danger
GHS08· Health Hazard GHS07· Irritant
Hazard Statements
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H360 May damage fertility or the unborn child
H370 Causes damage to organs
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.