Sodium metaborate
CAS 7775-19-1
EC 231-891-6
Formula BHO2.Na
MW 65.8 g/mol
Salts & Minerals Water TreatmentTextile, Leather & PaperAgriculture & Feed Cleaning & DegreasingpH Regulation & BufferingCorrosion InhibitionPreservation & Biocide
Description
Sodium metaborate (CAS 7775-19-1, EC 231-891-6) is an inorganic boron salt commonly identified by the formula NaBO2 and known under trade names including Kodalk and Borosoap. It carries no assigned E-code. It is registered under REACH and handled in accordance with applicable EU borate regulations.
In water treatment, sodium metaborate raises and stabilises pH through its alkaline buffering action, reducing corrosion in distribution systems. In textile and leather processing, it functions as a scouring and degreasing agent by saponifying fats and oils at elevated temperatures. Agricultural formulations use its biocidal properties to control fungi and algae in irrigation systems.
Sodium metaborate is available in anhydrous and hydrated grades, supplied as white lumps or granules. It is compliant with REACH registration requirements and subject to EU borate classification obligations. Standard packaging includes 25 kg bags and bulk quantities; technical-grade material is the primary commercial form.
In water treatment, sodium metaborate raises and stabilises pH through its alkaline buffering action, reducing corrosion in distribution systems. In textile and leather processing, it functions as a scouring and degreasing agent by saponifying fats and oils at elevated temperatures. Agricultural formulations use its biocidal properties to control fungi and algae in irrigation systems.
Sodium metaborate is available in anhydrous and hydrated grades, supplied as white lumps or granules. It is compliant with REACH registration requirements and subject to EU borate classification obligations. Standard packaging includes 25 kg bags and bulk quantities; technical-grade material is the primary commercial form.
Physical Properties
| Melting Point | 966 °C |
| Boiling Point | 1434 °C |
| Density | 2.464 g/cm³ |
| Appearance | White lumps.Soluble in water. Noncombustible. |
| Color | white hexagonal, hexane crystals, crystalline |
| Form | white hexagonal crystals |
| 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] |
Trade & Regulatory
| UN Number | 3077 |
Other Names
Sodium borateBoric acid, monosodium saltNaBO2KodalkRasoriteBorosoapSODIUMBORATESSODIUM MONOBORATE
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