Vertrel SFR specialty fluid can solve your most difficult defluxing needs, designed specifically for cleaning in lead-free and no-clean solders. It has excellent solvency power for a wide range of soils including ionics. As a replacement for n-propyl bromide (nPB) in most circuit cleaning applications, Vertrel SFR Flux Remover is an excellent choice. It carries a moderate global warming potential and medium VOC content. Vertrel SFR balances performance with favorable environmental and worker safety properties.