Lead Fluoroborate, 51.5%, CAS 13814-96-5, (also known as lead tetrafluoroborate or lead fluoborate) has the formula Pb(BF4)2. Copper Fluoroborate is most widely used as an electrolyte used with Tin Fluoroborate for Lead-Tin plating in PCB/Thin wall bearing and plating operations for fire extinguishers and battery connectors.