Silver sheet solder is cut to size at the bench for hard (torch) soldering and brazing of silver jewelry and metalwork. Each Harmony sheet weighs approximately 5 pennyweights (1/4 troy ounce, 7.7 grams) and measures approximately 40 mm × 60 mm with a thickness of 0.30–0.33 mm. Five flow points, Extra-Soft through Hard, cover new fabrication, repair work, and specialty applications such as enameling.
The grade names Extra-Soft, Soft, Medium, Medium-Hard, and Hard describe relative flow temperatures within this solder line. Each successive grade flows at a higher temperature, which generally produces a stronger bond. Flow point designations can vary between manufacturers, so one maker's Medium may flow near another maker's Hard.
Extra-Soft solder, also called Extra-Easy, produces a pale yellow appearance and leaves a visible seam on silver. It is recommended for eyeglass repair and applications requiring the lowest flow point. Extra-Soft is the only grade in this line that contains cadmium. All other grades are cadmium-free.
Soft solder is also referred to as Easy solder.
Hard (IT) solder flows at 1490°F (810°C), above typical enameling firing temperatures, which makes it suitable for soldering findings onto pieces prior to enameling. Keep this solder from contacting enamel directly, since zinc-bearing solders can cause enamel to bubble on contact.
Choosing a grade: When manufacturing, use the hardest (highest flow point) solder you can so that future repairs can be made with lower temperature solders. When repairing, use the softest grade possible, since the solder previously used is unknown.
| Part # | Grade | Flow Point | Silver Content |
|---|---|---|---|
| 804-404 | Extra-Soft (Extra-Easy), contains cadmium | 1190°F / 644°C | 30% |
| 804-405 | Soft (Easy) | 1260°F / 682°C | 45% |
| 804-406 | Medium | 1295°F / 702°C | 65% |
| 804-407 | Medium-Hard | 1375°F / 746°C | 75% |
| 804-408 | Hard (IT Solder) | 1490°F / 810°C | 80% Silver / 20% Copper |
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