The resin core inside the solder wire is a flux, which is a chemical substance used to clean and prepare the surfaces to be soldered. Nominal composition are 50% and tin 50% lead. Melting point 212 C. This composition gives it a eutectic melting point, which means it has a relatively low melting temperature and provides good wetting and flow characteristics. 3 Diameters are available.
$59.95

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