high quality welding wire 5kg spool 2.5mm

Rosin core solder wire, Medium Activity, Halogen-free 0.45%, non-hydrophilic.Like gommy gun AK47, plenty of power, slightly rough execution, well soldering abilitym quickly clean the base metal surface osidation, but the splash, smoke and the smell is slightly more. Flux 1.5-2.8%, best balance soldering temperature 250-420℃， Insulation resistance reference for reamining flux S.I.R≥5×1012Ω Melting temperature 227℃，LF alloy Sn99Ag0.3Cu0.7, quick soldering for electronic components, diameter 2.5mm,  hand soldering and machine soldering both available. Solder joint is full, good light reflection, good forming. 5kg each spool, packed in 20KGS cartons, spool size: diameter 130mm, height 120mm, spool color: black, white as you required. Quotation based on tin materials cost, which is changeful, so we update prices once a week.