The 837-P Water Soluble Flux Pen is a neutral, water-removable soldering flux. The organic activating system in 837-P has a neutral ρH at room temperature and becomes activated at soldering temperature. The 837-P flux is formulated to be effective over a broad preheat range and may be used for both leaded and lead-free applications. It cleans easily with hot or cold water. A chiseled tip provides exact delivery of the flux to the surface.