Nokorode soldering flux has been the brand preferred by professionals for over 100 years. They use it to clean and flux copper pipe in one operation, saving time and money. The creamy formula flows smoothly into even the smallest cavity. Joints using Nokorode are strong, leak free, stay active in excess of 800 degree and do not liquefy in hot temperatures or become brittle in severe cold. Nokorode flux is 100 percent lead free and odorless.