Solder-It TM paste is fast and easy to apply with a match, lighter, soldering iron or torch. 5 times stronger than ordinary solder. Tensile strength: 10,000 to 25,000 PSI. Flux is blended in. Flows freely and smoothly at 430 degrees F. Solders most metals. No distortion. Excellent Conductivity. Stress and vibration resistant. In a convenient, no-waste 7.1 gram syringe.