Used primarily in organic synthesis as a source of fluoride ions, rubidium tetrafluoroborate serves as a mild fluorinating agent in specialized reactions. It finds application in the preparation of other rubidium compounds and in research settings where a soluble, stable fluoroborate salt is required. Due to the rubidium cation's unique ionic characteristics, this compound may be selected to influence reaction solubility or crystallization behavior in advanced materials research. It is also occasionally employed in electrochemical studies and in the development of ionic liquids. Its use remains largely confined to laboratory and experimental contexts rather than industrial-scale processes.