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CAS Registry Number (CASRN):

1303-96-4 ,


Borax|Penta ,


Na2B4O7·10H2O or Na2[B4O5(OH)4]·8H2O ,

CAS Registry Number (CASRN):

1303-96-4 ,

SAX Number:

91MBZ8H3QO ,

Molar mass (g/mol):

381.37 ,

Density (g/cm3):

1.73 ,

Melting point (°C):

743 ,

Boiling point (°C):

‎1575 ,



Sodium Tetra borate Decca hydrate

CAS/TSCA Number 1303-96-4

Borax Decca hydrate is the refined form of natural sodium borate. Composed of boric oxide (B2O3), sodium oxide, and water, it is a mild, alkaline salt, white and crystalline, with excellent buffering and fluxing properties. Available in powder or granular form, Borax Decca hydrate is an important multifunctional source of B2O3, particularly for processes in which the simultaneous presence of sodium is beneficial

Applications and benefits

1- Soap and detergents

Borax Decca hydrate is incorporated in many cleaning products as a pH buffering agent, to aid in the emulsification of oils, and as a gentle abrasive. Borax Decca hydrate is added to powdered hand soaps to remove medium to heavy soils encountered in industrial operations. It is gentle to the skin, yet highly effective in removing dirt. Borax Decca hydrate is added to formulations to clean hard surfaces such as metals, glass and ceramics. It is also used as an additive in hand cleaners, polishes and waxes, and industrial/institutional cleaning compounds. In laundry detergents it facilitates the removal of oily soils from fabrics, and imparts alkalinity, pH buffering and softening of the wash water. It is also used to stabilize enzymes.

2- Personal care products

Borax Decca hydrate is used in cosmetics, toiletries and pharmaceuticals. In contact lens solutions, it used in conjunction with boric acid as a gentle cleaner and buffering agent. Borax is also used as

A crosslinking agent to emulsify waxes and other paraffin used as a base for lotions, creams and ointments.

3- Metallurgical fluxes

The ability of Borax Decca hydrate to dissolve metal oxides is exploited in the recovery of metals such as brass, copper, lead and zinc from scrap or smelting slag.

In ferrous metallurgy, Borax Decca hydrate is used as a cover flux to prevent oxidation at the surface of the molten ingot. In welding, brazing, and soldering, Borax Decca hydrate covers the metal surfaces,

Excluding air and preventing oxidation. It also acts as a solvent and cleaning agent.

4- Corrosion inhibition

Borax Decca hydrate is incorporated in many aqueous systems requiring corrosion inhibition. It protects ferrous metals against oxidation and finds use in the manufacture of automotive and engine coolant formulations, and various water treatment chemicals.

The high solubility of Borax Decca hydrate in ethylene glycol makes it especially useful in car antifreeze formulations. Borax Decca hydrate neutralizes the acidic residue resulting from the decomposition of ethylene glycol and minimizes the rate of oxidation at the surface of the metal. Aqueous solutions of Borax Decca hydrate have replaced chromates in railroad and other diesel engine coolants.

5- Adhesives

Borax Decca hydrate is part of the starch adhesive formulation for corrugated paper and paperboard, and is a peptizing agent in the manufacture of casein-based and dextrin-based adhesives. It greatly improves the tack and green strength of the adhesive by crosslinking conjugated hydroxyl groups.

6- Wire drawing

Borax Decca hydrate neutralizes the residual acid from the pickling stage, and the deposit of the salt remaining on the wire is valuable as a carrier of dry powdered lubricant.

7- Refractories

Borate Decca hydrate compounds are used as stabilizers and bonding agents in specialty abrasives. Borax Decca hydrate gives an intermediate-temperature glassy bond prior to the establishment of the ceramic bond, at which point the borate compound is frequently volatilized from the system.

8- Some other applications

Borax Decca hydrate is used as a flame retardant for cellulosic materials, a buffer and catalyst for organic dyes, a carrier for herbicides, a coolant for diesel engines, and a degreasing buffer in enameling processes.

Chemical and physical properties

1- Stability

Borax Decca hydrate is chemically stable under normal storage conditions. It will slowly lose water of crystallization if exposed to a warm, dry atmosphere. Conversely, exposure to a humid atmosphere can cause recrystallization at particle contact points, resulting in caking. When storing the product, care should therefore be taken to avoid wide fluctuations in temperature and humidity, and to ensure that the packaging is not damaged.

2- Buffering action

Dissolved in water, Borax Decca hydrate hydrolyzes to give a mildly alkaline solution. It is thus capable of neutralizing acids. It also combines with strong alkalis to form compounds of lower ph. The relatively constant pH of Borax Decca hydrate solutions makes it an excellent buffering agent.

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