CircuitWorks®Flux Dispensing Pens provide controlled and exact applications that are generally compatible with most materials in the electronics industry. Apply flux to printed circuit boards, heat sinks, chip carriers, switches, sockets and much more. CircuitWorks® fluxes are fast drying, and the applicators are completely portable and produce minimal excess flux waste. All CircuitWorks® brand fluxes and flux application tools are RoHS Compliant.