Potassium tetrafluoroborate

Potassium tetrafluoroborate (CAS 14075-53-7), also known as potassium fluoborate and abbreviated KBF4, is an inorganic fluoroborate salt.

Where is Potassium tetrafluoroborate used?

• Metallurgy: flux agent, grain refiner and controlled fluoride source in high-temperature processing
• Aluminum and magnesium casting: grain-refining additive that improves mechanical properties of finished components
• Electronics: flux component in soldering pastes and brazing alloys, where controlled fluoride release aids oxide removal
• Abrasives: active filler in grinding wheels and coated abrasives, reducing heat buildup and extending tool life
• Surface treatment and electroplating: fluoride donor in bath formulations for metal finishing.

Good to know: Consistent fluoride content and low impurity profiles are critical to process control in electronics and specialty metallurgical applications.

Commercial specifications

• Technical grade: purity typically 98% to 99%+
• High-purity grades for electronics and specialty metallurgical applications