MG Chemicals 63 37 Rosin Core Leaded Solder, 0.04" Diameter (19 Gauge), 1 lb Spool (4886 454G) 1969 MERCEDES BENZ 280 SL Fabricante MERCEDES BENZ PlanetCarsZ. Weight: 454 g (1. 0 lb) Diameter: 1. 01 mm (0. 040 in) Gauge: 19 Eutectic alloy (liquidus = solidus temperature) Alloy exceeds J STD 006C and meets ASTM B 32 purity requirements Flux meets J STD 004B Rosin activated flux Fast wetting Fast flowing Non corrosive residue Non conductive residue 4886 Sn63 Pb37 RA Solder Wire is electronics grade solder wire. This 63 37 solder uses the eutectic tin to lead alloy ratio, which is complemented with an RA like flux core. This tin lead solder wire meets J STD 004B, ASTM B 32, and exceeds J STD 006C specifications. It is one of the easiest solders to work with because it offers a low melting temperature with a sharp melting solidification point, which results in robust and reliable joints that are highly resistant to whisker formation. This 63 37 rosin core solder achieves a consistent solder and flux percentage thanks to our state of the art extrusion wire drawing machine, which continuously monitors the wire to prevent voids and ensure consistency, providing a top grade solder wire.