Fluoboric Acid(Hydrogen Fluoboric Acid, Tetrafluoro Boric Acid)

[Molecular Formula] HBF₄

[Molecular Weight] 87.83

[Properties]
Colorless transparent liquid, can't exist in pure state, only exist in aqueous solution. The industrial products usually are aqueous solution whose concentration are about 42-48%; specific gravity(42% aqueous solution): 1.32; specific gravity(48% aqueous solution): 1.37; It is stable in concentrated solution, will decompose when heated to 130 and can mutually soluble with water or alcohol. It can slowly decompose to produce hydroxyl fluoboric acid(HBF₃OH) in aqueous solution. Its stability gradually reduces when contacting with glass surface, the hydrolysis degree of 0.047M solution of fluoboric acid reaches to 72.6% from original 20.6% after stored in glass window for 32 days. It has strong corrosion, but doesn't corrode glass under normal temperature. It can react with metal, metal fluoride, oxide, hydroxide or carbonate to produce corresponding fluoboric salt, toxic.

[Uses]
It is used as cleaning agent and corrosive for oxide and silicate film on the surface of metal, cleaning agent for aluminum and alloy before electroplating. Its 2.5% solution is used to electropolish pure aluminum, remove welding agent from metal base and rewashing solution of electroplated parts. It is also used as catalyst in alkylation and polymerization, corrosive inhibitor, chemical reagent and as material to produce fluoboric salt.

[Quality Index] Enterprise Standard(ES)

Item	Index	Index	Item	Index	Index
HBF4, %	50.0	40.0	Chloride(Cl),%	0.005	0.003
Free Fluoboric Acid(H3BO3), %	0.60	0.6	Sulfate(SO4),%	0.03	0.02
Iron(Fe), %	0.01	0.008	SiF6, %	0.10	0.20

[Package] Polyethylene plastic barrel, net weight: 25kg/barrel.