Rosin Soldering Paste
Rosin, formerly called colophony or Greek pitch / Colophonia Resina
Natural rosin soldering paste is without acid, do not corrode, low residue / Non-acid Soldering Paste, used to soldering electronic element, IC, computer and wireless products.
In industry, rosin is the precursor to the flux used in soldering. The lead-tin solder commonly used in electronics has about 1% rosin as a flux core helping the molten metal flow & making a better connection by reducing the refractory solid oxide layer formed at the surface back to metal. (wikipedia)
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