Manufacturer and supplier of industrial chemistry and rare earth metals. China, Ningbo.

Borax/Sodium tetraborate, pentahydrate

Back to the list
Product

Molecular Formula:Na2B4O7·5H2O、Na2B4O7·10H2O

Molecular Weight:291.29、381.36

CAS No:12179-04-3、1303-96-4

Property:1. Colorless semitransparent crystal or white single slant crystal powder. No smell, taste salty, easily soluble with glycerin, water, slightly soluble in ethanol, not soluble in acid, water solution appears as alkaline. 2. White crystal powder. Effloresce in dry air. It’s easily soluble in water and glycerin, water solution is alkali. not soluble with alcohol and acidity. when heated to 100℃, loss 5H2O, up to 350℃-400℃, loss hydrate absolutely. Melting point:75℃.

Specification:

1. Borax Pentahydrate
B2O3
48.5%Min
Na2O
21.5%Min
SO4
0.061%Max
Cl
0.00015%Max
Fe
0.00015%Max
Water Insoluble Matter
0.013%Max
2. Borax Decahydrate
Na2B4O7·10H2O
99.5% Min-- 95% Min
CO2
CO2 0.1% Max-- 0.2% Max
Insoluble in water
0.04% Max-- 0.04% Max
SO42-
0.1% Max-- 0.2% Max
Cl-
0.03% Max-- 0.05% Max
Fe
0.002% Max --0.005% Max
B2O3
36.3% Max-- 36.3% Max

Packing:

  • Net each in 25kg plastic woven bag, lined with PE bag.

Usage:

  • Mainly used for glass and porcelain enamel industry. In glass industry, it can enhance transparency and heat-resistant property. In porcelain enamel products, it can make enamel not easy to fall off and with luster. It also widely used in optics glass, glass fiber, colored metal as jointing agent, cohering agent for jewelry, printing and dyeing, detergent, refined gold, cosmetics, pesticide, fertilizer, borax soap, antiseptic, antifreeze and in pharmaceuticals as disinfectors etc. It’s also one of basic raw material for making other boric compound.
Image Product
`

Our representative offices