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Shanghai Yixin Chemical Co., Ltd.
Shanghai Yixin Chemical Co., Ltd.
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Flux / Fire Retardant Sodium Tetraborate , ISO9001 Approval Tetraborate Decahydrate

Product Details

Place of Origin: CHINA

Brand Name: YIXIN

Certification: SGS

Model Number: YXB-001

Payment & Shipping Terms

Minimum Order Quantity: 1ton

Price: USD500-800/TON

Packaging Details: 50kg/pp bag 20FCL:25MT

Delivery Time: 2-5days

Payment Terms: T/T, Western Union, L/C, D/P

Supply Ability: 3000 ton per month

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sodium tetraborate decahydrate


sodium borate decahydrate

Borax Decahydrate
Boiling Point:
1575 °C
Melting Point:
Borax Decahydrate
Boiling Point:
1575 °C
Melting Point:
Flux / Fire Retardant Sodium Tetraborate , ISO9001 Approval Tetraborate Decahydrate

95% Borax decahydrate powder use for flux and fire retardant with

ISO9001 CAS NO 1303964

 ►Origin of Borax Decahydrate   



 • Sodium tetraborate was first discovered in dry lake beds in Tibet and was


imported via the Silk Road to the Arabian Peninsula in the 8th Century




•Borax first came intocommon use in the late 19th century whenFrancis


Marion Smith's Pacific Coast Borax Company began to market and popularize a


large variety of applications.Borax is a component of many detergents,


cosmetics, and enamel glazes.


• It is used to make buffer solutions in biochemistry, as a fire retardant, as an


anti-fungal compound, in the manufacture of fiberglass, as a flux in


metallurgy,neutron-capture shields for radioactive sources, a texturing agent in


cooking, as a precursor for other boron compounds, and along with its inverse,


boric acid, is useful as an insecticide.In artisanal gold mining, the borax method


is sometimes used as a substitutefor toxic mercury in the gold extraction




•Borax was reportedly used by gold miners in parts of the Philippines in the




 ►Product description



      1. Borax Decahydrate 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.


2. Available in powder or granular form.Borax Decahydrate is an important


multifunctional source of B2O3, particularly for processes in which the


simultaneous presence of sodium is beneficial.Borax decahydrate , also known


as sodium borate, is an important boron compound, a mineral, and a salt of boric


acid.Powdered borax is white, consisting of soft colorless crystals that dissolve


easily in water.





Poruct name

borax decahydrate

Molecular formula   Na2B4O7.10H2O
Molecular wight  381.37
Properties  White power or crystal granular 
Purity   95% min 
UN number   1458








 Specification for borax decahydrate  powder 95%

            Na2B4O7.10H2O  95.00%
 B2O3    ≥36.47%
Na2O     ≥16.47%
Na2CO3 ≤0.2%
NaCL ≤0.5%
Fe     ≤0.005%
Water insoluble    ≤0.04%






  1. Borax Decahydrate is chemically stable under normal storage conditions.


  2. It will slowly lose water of crystallisation if exposed to a warm, dry atmosphere.


Conversely, exposure to a humid atmosphere can cause recrystallisation at particle


contact points, resulting in caking.


  3. 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




  4. Dissolved in water, Borax Decahydrate hydrolyzes to give a mildly alkaline




 5. It is thus capable of neutralizing acids. It also combines with strong alkalis to


form compounds of lower pH.


  6. The relatively constant pH of Borax Decahydrate solutions


makes it an excellent buffering agent





A mixture of borax and ammonium chloride is used as a flux when welding iron and


steel. It lowers the melting point of the unwanted iron oxide (scale), allowing it to


run off. Borax is also used mixed with water as a flux when soldering jewelry metals


such as gold or silver. It allows the molten solder to flow evenly over the joint in


question. Borax is also a good flux for "pre-tinning" tungsten with zinc – making the


tungsten soft-solderable.Borax is often used as a flux for forge welding.



· Fire retardant



Flux / Fire Retardant Sodium Tetraborate , ISO9001 Approval Tetraborate Decahydrate 0


· Anti-fungal compound for cellulose insulation


· Moth proofing 10% solution for wool


· Pulverized for the prevention of stubborn pests (e.g. German cockroaches) in


closets, pipe and cable inlets, wall panelling gaps, and inaccessible locations


where ordinary pesticides are undesirable




Packing details 


Packing :25/50KG plastic pp bag

              1 ton /jumbo bag ,or customized.

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