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Thackery Silver Flux Core Solder Wire - SAC305 - available in 1mm .8mm and .5mm thickness Sold in lengths of 5m/15ft, 10m/30ft, 25m/75ft and 50m/150ft Silver solder SAC305 is a lead-free alloy that contains 96.5 % tin, 3% silver, and 0.5% copper. This alloy falls under the JEIDA recommendation for lead-free soldering. This solder is not intended for jewelry, rather for audiophile electronics and other applications where a high level of conductivity is desired. - Superior conductivity - Less dross - Superior joint strength - Excellent flow across temperature ranges - Flux core