Silver Solder Hard Flow Solder (1 Foot) Our Hard Silver Solder is perfect for Sterling Silver Jewelry making and repairs. It's high temperature melting point of 1,365F (741C) results in strong, solid Solder joints, and is recommended for more experienced Jewelers. Melting Point: 1,365F (741C) - Flow Point: 1,450F (788C) Cadmium-free Thickness: 20 Gauge