Silver Solder Paste Hard (1/4 Troy Ounce) Soldering is so easy with our Silver Paste Solder. Each syringe contains 1/4 Troy Ounce of Silver Solder mixed with Flux Our Hard Silver Solder contains 75% Silver, and melts at about 1365*. Works great with our Torch! Hard Silver Solder, Contains: 1/4 ounce, Flow point: 1450, Melting point: 1365, Color: Silver