Borax decahydrate
CAS 1303-96-4
EC 603-411-9
Formula B4Na2O7.10H2O
MW 381.37 g/mol
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Description
Borax decahydrate (CAS 1303-96-4) is the naturally occurring sodium borate salt, commercially known under trade names including Neobor and Bura. It carries no E-code designation and is registered under EC number 603-411-9. The molecular formula is B4Na2O7·10H2O.
In glass and ceramic glazes, borax acts as a flux, lowering the melting point of silica and improving surface hardness. In metalworking fluids and corrosion inhibitor formulations, it buffers pH and forms protective borate complexes on metal surfaces. Textile manufacturers use it to sequester calcium and magnesium ions, preventing mineral interference during dyeing.
Borax decahydrate is supplied in technical and refined grades as crystalline powder or granules, with packaging typically available in 25 kg bags and bulk quantities. It is subject to REACH registration and classified under HS code 28401990. Procurement teams should verify supplier SDS documentation for current reproductive toxicity classification requirements under CLP.
In glass and ceramic glazes, borax acts as a flux, lowering the melting point of silica and improving surface hardness. In metalworking fluids and corrosion inhibitor formulations, it buffers pH and forms protective borate complexes on metal surfaces. Textile manufacturers use it to sequester calcium and magnesium ions, preventing mineral interference during dyeing.
Borax decahydrate is supplied in technical and refined grades as crystalline powder or granules, with packaging typically available in 25 kg bags and bulk quantities. It is subject to REACH registration and classified under HS code 28401990. Procurement teams should verify supplier SDS documentation for current reproductive toxicity classification requirements under CLP.
Physical Properties
| Melting Point | 75 °C |
| Boiling Point | 320 °C |
| Density | 1.73 g/cm³ |
| Appearance | Borax is a noncombustible (an inherent fire retardant), bluish-gray or green, odorless crystalline powder or granules. |
| Color | White, gray, bluish or greenish white |
| Odor | Odorless |
| Form | Powder/Solid |
| Water Solubility | 60 g/L (20 ºC) |
| Vapor Pressure | 0.213 hPa (20 °C) |
| pH | 9.15-9.20 (25℃, 0.01M in solution) |
Safety & Handling (Learn More)
Danger GHS08 GHS07
H
H303H315H319H335H360H361H370H372H373H413
P
P203P260P261P264P270P271P273P280P318P319P321P405P501P264+P265P301+P317P302+P352P304+P340P308+P316P332+P317P337+P317P362+P364P403+P233P305+P351+P338
Trade & Regulatory
| HS Code | 28401990 |
| UN Number | 1458 |
| Storage Class | 6.1D - Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects |
| WGK (Germany) | 1 |
Other Names
Borax (B4Na2O7.10H2O)E285boraxNa2B4O710H2Osodium borateburajaikin
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