Properties: colorless transparent liquid with strong acidity. It can hydrolyze and doesn't corrode glass at the normal temperature. But its concentrated solution can't be stored in glass bottle for a long time. It is toxic and corrosive.
Uses: used as stabilizer for diazo salts, catalyst in organic synthesis, and used in the dissolving of sponge titanium and its alloy, as well as printed circuit board industry.
Quality Index Storage: stored in dry, ventilated, shady and cool place.

Item	Index(%)
	AR	CP
Fluoroboric Acid(HBF4)≥	40	40
Chloride(Cl)≤	0.002	0.005
Sulfate(SO4)≤	0.001	0.002
Iron(Fe)≤	0.001	0.003
Heavy Metals(as Pb)≤	0.002	0.005