97% Potassium Fluoborate / KBF4 Fluorine Chemicals

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97% Potassium Fluoborate / KBF4 Fluorine Chemicals




 KBF4: 97%min

 FH3BO3: 0.4%max

 K2SiF6: 1.5%max

 Na: 0.1%max

 Ca: 0.05%max

 Mg: 0.05%max

 CI-: 0.1%max




Physical Chemical Properties

Molecular Weight


Molar Volume



2.50-2.55 grams/cm3

Melting Point



Decomposes starting slowly at approximately 615oC; at 700o 

to KF & BF3(gaseous)

Decomposition Pressure (510-930oC)

Log Pmm = 6317/T+8.15

Heat of Decomposition

28900 cal/mole


White, fine granular, free flowing crystals

Crystal structure

a) at 20oC,4.5 gms per liter of water

b) at 100oC, 62.7 gms per liter of water

c) at 20oC, 14 mg per 1000 ml of ethyl alcohol




Does not react with air and moisture at normal temperature. 

Contact with acids or acid fumes may liberate hydrogen fluoride




KBF4 is a key ingredient in grain refining salts for aluminum,and can be use separately or combined with Potassium Titanium fluoride(k2TiF6) to form a grain refining flux. Titanium and other elements to form TiB2 and other borides, that act as grain nucleating agents,providing a cast structure of fine grain. Grain refiners improve mechanical properties and prevent cracking in aluminum castings.

KBF4 is also used as a cleansing flux for nonferrous metals like aluminum and magnesium. In the molten state on the surface of molten metal it will absorb oxides and other surface debris. Once absorbed the oxide can be removed out of the furnace by surface skimming. It can also be combined with other salts to form fluxes. The fluorine content from the KBF4 increases fluidity of any molten flux. In addition, it is used as an atmospheric barrier over molten magnesium providing an inert cover ,preventing rapid oxidation of the molten magnesium. KBF4 can also be used as an ingredient in welding ,brazing, and soldering fluxes.

KBF4 is used as binder/filler in abrasive products. It has a melt point that is ideal for use in grinding wheels and other abrasives where baking of the product is involved. In the semi-solid state it , in effect , glues the various grits together providing a matrix for the particle

KBF4 is a key ingredient in "Boronizing" steel. This hard-faced steel is used in applications in which wear resistance is important , such as in oil and gas fields , drilling equipment, and more.

KBF4 is a common ingredient in refractories that are pressed or formed into complex shapes for the nonferrous casting industry. These shapes include spouts, baffles, and other parts used in foundries.


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Ms. Natalie.Huang
Tel: 86-20-83020725
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Guangzhou Kunhai Trading Co.,Ltd
JINYING BLDG, HUANSHI ZHONG RD.,YUEXIU DISTRICT, Guangzhou, Guangdong, China (Mainland) / 510050
Fax: 86-20-83020712
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