Sodium metaborate Property

Melting point:

966 °C

Boiling point:

1434 °C

Density 

2.464

solubility 

soluble in H2O

pka

8.94[at 20 ℃]

form 

white hexagonal crystals

color 

white hexagonal, hexane crystals, crystalline

Water Solubility 

g/100g solution H2O: 14.10 (0°C), 22.00 (25°C), 55.60 (100°C); solid phase, NaBO2 ·4H2O (0°C, 25°C), NaBO2 · 2H2O (100°C) [KRU93]

NIST Chemistry Reference

Sodium metaborate(7775-19-1)

EPA Substance Registry System

Sodium metaborate (7775-19-1)

Safety

RIDADR 

UN3077(solid)

Hazardous Substances Data

7775-19-1(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H319Causes serious eye irritation

H361Suspected of damaging fertility or the unborn child

Precautionary statements

P201Obtain special instructions before use.

P202Do not handle until all safety precautions have been read and understood.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P281Use personal protective equipment as required.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P308+P313IF exposed or concerned: Get medical advice/attention.

P405Store locked up.

P501Dispose of contents/container to..…

Sodium metaborate Chemical Properties,Usage,Production

Description

Sodium Metaborate is the sodium salt of Metaborate. Sodium metaborate is used in the manufacturing of borosilicate glasses. It is also a component of herbicides and antifreeze¹. It can also be used as an oil additive with anti-wear properties². Sodium metaborate electroreduction in the alkaline system can act as a novel desulphurization process of coal water slurry³. It also has role in hydrolysis of sodium borohydride to minimize the water utilization⁴. It can also act as a novel alkali in alkali/surfactant/polymer flooding⁵. It is also useful in the thermo-chemical production of sodium borohydride⁶, which is a safe and practical hydrogen storage material for on-board hydrogen production.

Reference

1. https://en.wikipedia.org/wiki/Sodium_metaborate
2. Liu, Weimin. "The Antiwear Properties of Sodium Metaborate as an Oil Additive” Tribology 48.4(1990):290-293.
3. Shen, Yafei, T. Sun, and J. Jia. "A novel desulphurization process of coal water slurry via sodium metaborate electroreduction in the alkaline system." Fuel 96.7(2012):250-256.
4. Marrero-Alfonso, Eyma Y., et al. "Minimizing water utilization in hydrolysis of sodium borohydride: The role of sodium metaborate hydrates." International Journal of Hydrogen Energy 32.18(2007):4723-4730.
5. Chen, Fuzhen, et al. "Evaluation the performance of sodium metaborate as a novel alkali in alkali/surfactant/polymer flooding." Journal of Industrial & Engineering Chemistry 19.2(2013):450-457.
6. Eom, Kwang Sup, et al. "Thermochemical production of sodium borohydride from sodium metaborate in a scaled-up reactor." International Journal of Hydrogen Energy 38.6(2013):2804-2809.

Chemical Properties

White lumps.Soluble in water. Noncombustible.

Uses

Herbicide. Also available commercially as octahydrate and tetrahydrate.

Definition

ChEBI: An inorganic sodium salt having metaborate as the counterion.

Agricultural Uses

Herbicide, Insecticide, Fungicide, Nematocid: Not listed for use in EU countries. Registered for use in the U.S

Agricultural Uses

Rasorite is one of the sources of borax which is produced by re-crystallizing the ores. Borax (Na₂B₄0₇?10H₂O

) is a source of the boron micronutrient and has many uses.

Trade name

ALLPRO BARACIDE®; ATRATOL®[C]; BAREGROUND®; MONOBOR-CHLORATE®; PRAMITOL®; TRI-KILL®; UREABOR®