Kester 24-7068-6401 Solder Wire, Water Soluble, Lead Free, SAC305, 3.3%, 0.020′,
Alloy: Sn96.5Ag03Cu.5 (SAC305). Kester 331 Flux-Cored Wire ‘Lead Free’ Product Overview Kester 331 Organic Flux is a water-soluble formula for use in flux-cored solder wire. The flux is more heat stable than most organic fluxes, resulting in minimal smoke and odor.