Fluoroboric Acid

Fluoroboric acid (also spelt fluoboric acid) is the chemical compound with the formula HBF4. It is the conjugate acid of tetrafluoroborate. It is available commercially as a solution in water and other solvents such as diethyl ether. With a strength comparable to nitric acid, fluoroboric acid is a strong acid with a weakly coordinating, non-oxidizing conjugate base.

Read more about Fluoroboric Acid:  Production, Other Fluoroboric Acids