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Sodium tetraborate decahydrate

Also known as: Borax, Disodium tetraborate decahydrate, Sodium borate decahydrate, Borax decahydrate, Disodium tetraborate, 2,4,6,8,9-Pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane-3,7-diolate, sodium salt, hydrate (1:2:10), EINECS 215-540-4, MFCD00149193

Sodium tetraborate decahydrate (CAS 1303-96-4) is a compound in the Inorganic Chemicals category listed in the Jingsj chemical database. It has the molecular formula B4H20Na2O17 and a molecular weight of 381.37 g/mol. Key properties include a melting point of 75 °C, a boiling point of 320°C and a density of 1.73 g/mL at 25 °C(lit.). GHS signal word: Danger. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
1303-96-4
Jingsj CID
J-33188-3
Molecular Formula
B4H20Na2O17
Molecular Weight
381.37 g/mol
Category
Inorganic Chemicals
Last updated
8/21/2026
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Physicochemical Properties

Melting Point75 °C
Boiling Point320°C
Density1.73 g/mL at 25 °C(lit.)
Exact Mass382.086823
PSA184.57000
Additional Property60 G/L (20 ºC)

GHS Safety & Compliance

Health HazardSignal word: Danger

Activity & Biological Data

Additional Information[1]. Elder DP, et al. Pharmaceutical excipients - quality, regulatory and biopharmaceutical considerations. Eur J Pharm Sci. 2016 May 25;87:88-99.

Customs & Trade Information

HS Code28401990

Frequently Asked Questions

What is the CAS number of Sodium tetraborate decahydrate?

The CAS number of Sodium tetraborate decahydrate is 1303-96-4.

What are the molecular formula and molecular weight of Sodium tetraborate decahydrate?

Sodium tetraborate decahydrate has molecular formula B4H20Na2O17 and molecular weight 381.37 g/mol.

Is Sodium tetraborate decahydrate hazardous?

Sodium tetraborate decahydrate has GHS signal word Danger.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Sodium tetraborate decahydrate (CAS 1303-96-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-33188-3 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.