Soldering flux is (or at least, should be) one of the ubiquitous features of any electronics bench. It serves the purpose of excluding oxygen from a solder joint as it solidifies, and in most ...

Emil Otto has developed flux gels for manual rework on solar modules, that are based on solar module production fluxes.

Kester 24-6040-0027 - (1) Spool, 1 Pound per Spool Diameter: 0.031" Inch (0.80mm) Alloy: 60% Tin / 40% Lead (Product contains Halogen) Core / Flux Type: Rosin Core / 44 Flux (3.3%) Authentic ...