Rectorseal 4 oz. Nokorode Regular Paste Flux is a lead-free, all-purpose, soft soldering paste flux. It is ideal for use with 95/5 and other common solders. The oil base protects the solder joint against corrosive attack. It cleans and fluxes all at one time. When heated, it reduces surface tension and allows the solder to flow easily and uniformly into the joint. It works to deliver a strong, leak-free joint. It is ideal when used on copper and brass fittings. It is Annex G Certified, ANSI Standard 61 Approved, and NSF Certified. NOKORODE regular paste flux will not freeze or decompose. No odor. Lead-free. Recommended for use on all solder alloys including 95/5 and all lead-free solders. Meets Specification O-F-506, Type 1A and A-A-51145, MIL-F-4995-2. Certified to NSF/ANSI Standard 61, Annex G.