8351 is a halogen-free organic liquid solder flux with low activity. It is a no-clean flux with a low solids content that leaves virtually no residue. Solder joints appear shiny after soldering, even without cleaning.This halogen free flux is the best soldering flux for wave soldering and surface mount assembly. It may be applied by spray or foam, or by wave fluxing. It is also re-flowable in air or nitrogen.We also offer rosin-based flux, lead-free no-clean flux, and lead-free water-soluble flux in liquid format.For a paste flux, try MG’s 8341 or 8342.