CAS #:

Linear Formula:

Na2B4O7 • 510H2O

MDL Number:


EC No.:



Sodium Tetraborate Pentahydrate
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Sodium Tetraborate Pentahydrate Properties (Theoretical)

Compound Formula H10Na2B4O12
Molecular Weight 291.288
Appearance White powder or granules
Melting Point 200 °C
Boiling Point N/A
Density 1.82 g/cm3
Bulk Density 750 kg/m3
Solubility in H2O 3.8% (20 °C), 51.2% (100 °C)
pH 9.3 (3% solution)
Exact Mass 292.034 g/mol
Monoisotopic Mass 292.034 g/mol

Sodium Tetraborate Pentahydrate Health & Safety Information

Signal Word N/A
Hazard Statements N/A
Hazard Codes N/A
Precautionary Statements N/A
RTECS Number VZ2540000
Transport Information NONH for all modes of transport

About Sodium Tetraborate Pentahydrate

Sodium Tetraborate Pentahydrate is generally immediately available in most volumes including bulk quantities. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available. Additional technical, research and safety (SDS) information is available. Please request a quote above to receive pricing information based on your specifications.

Sodium Tetraborate Pentahydrate Synonyms

Borax pentahydrate, Sodium borate pentahydrate, Disodium tetraborate pentahydrate, Boron sodium oxide pentahydrate, Sodium bicyclo[3.3.1]tetraboroxane-3,7-diolate hydrate (2:1:5), Di-sodium tetraborate pentahydrate, Boric acid sodium salt pentahydrate, Tincalconite, Etibor-48, CAS 11130-12-4, CAS 12045-88-4, B4Na2O7.5H2O

Chemical Identifiers

Linear Formula Na2B4O7 • 510H2O
MDL Number MFCD00287285
EC No. 601-071-6
Beilstein/Reaxys No. N/A
Pubchem CID 86341921
IUPAC Name disodium; [oxido(oxoboranyloxy)boranyl]oxy-oxoboranyloxyborinate; pentahydrate
SMILES B(=O)OB([O-])OB([O-])OB=O.O.O.O.O.O.[Na+].[Na+]
InchI Identifier InChI=1S/B4O7.2Na.5H2O/c5-1-9-3(7)11-4(8)10-2-6;;;;;;;/h;;;5*1H2/q-2;2*+1;;;;;

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Boron products. Boron Bohr ModelBoron (atomic symbol: B, atomic number: 5) is a Block P, Group 13, Period 2 element with an atomic weight of 10.81. The number of electrons in each of boron's shells is 2, 3 and its electron configuration is [He] 2s2 2p1. The boron atom has a radius of 90 pm and a Van der Waals radius of 192 pm. Boron was discovered by Joseph Louis Gay-Lussac and Louis Jacques Thénard in 1808 and was first isolated by Humphry Davy later that year. Boron is classified as a metalloid is not found naturally on earth. Elemental BoronAlong with carbon and nitrogen, boron is one of the few elements in the periodic table known to form stable compounds featuring triple bonds. Boron has an energy band gap of 1.50 to 1.56 eV, which is higher than that of either silicon or germanium. The name Boron originates from a combination of carbon and the Arabic word buraqu meaning borax.


Sodium Bohr ModelSee more Sodium products. Sodium (atomic symbol: Na, atomic number: 11) is a Block D, Group 5, Period 4 element with an atomic weight of 22.989769. The number of electrons in each of Sodium's shells is [2, 8, 1] and its electron configuration is [Ne] 3s1. The sodium atom has a radius of 185.8 pm and a Van der Waals radius of 227 pm. Sodium was discovered and first isolated by Sir Humphrey Davy in 1807. In its elemental form, sodium has a silvery-white metallic appearance. It is the sixth most abundant element, making up 2.6 % of the earth's crust. Sodium does not occur in nature as a free element and must be extracted from its compounds (e.g., feldspars, sodalite, and rock salt). The name Sodium is thought to come from the Arabic word suda, meaning "headache" (due to sodium carbonate's headache-alleviating properties), and its elemental symbol Na comes from natrium, its Latin name.


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