Silver Sheet Solders-Extra Soft, Soft, Med, Med Hard & Hard-1/4 Oz. Sheets

     Part No.  Flow Points

• 804-404  Extra Soft* (1190^oF / 644^oC)
• 804-405  Soft (Easy) (1260^oF / 682^oC)
• 804-406  Medium (1295^oF / 702^oC)
• 804-407  Medium-Hard (1375^oF / 746^oC)
• 804-408  Hard IT (1490^oF / 810^oC)

This is one piece of Silver Sheet Solder weighing approximately 5 Pennyweights (5 DWT-or 1/4 troy ounce or 7.7 grams). This silver solder is used for hard (torch) soldering (brazing) only.  Sheet thickness is between 0.3 mm to 0.33 mm and size of sheets vary and are approx. 40 mm x 60 mm.

*Extra Soft contains cadmium.  All other silver solders are cadmium free.

The terms Extra-Soft, Soft, Medium, Medium-Hard, & Hard are used to describe the relative temperature flow points between one type or more specifically, one brand of hard solder. Extra Soft will have a lower flow point than Soft, which will have a lower flow point than Medium, which will have a lower flow point than Medium-Hard. Extra Hard will have the highest flow point temperature. This labeling system generally holds true for all brands of silver solders, but there are differences between manufactures, so you could find one makers Medium flows at the same time another makers Hard, theoretically, the stronger the bond.

Extra soft silver solder has a pale yellow look and when used will leave a visible seam on silver. Recommended for eyeglass repair and other work that requires a lower flow point relative to other silver solders. *Extra Soft is the only silver solder we carry that is Cadmium Bearing. All other silver sheet and wire solders we carry are Cadmium free.

Extra Soft solder is also called Extra-Easy.  Soft solder is also called Easy solder.

Because Hard solder has such a high flow point, it can be referred to as an IT solder for use on findings being enamel fired. You can use this solder to solder findings onto pieces to be enameled before the pieces are to be enameled. Since the enameling firing temperature is below the high 1490oF flow point of this Extra Hard Silver Solder, the soldered findings will remained soldered. Make sure this Hard solder or IT solder does not come in contact with enamel. If enamel comes into contact with this or any other zinc bearing solder, the enameling may bubble.

What temperature solder should you use? If you are manufacturing, use the highest temperature (Hardest) solder you can so repairs may be made later with lower temperature solders. If you are doing repairs, use the lowest temperature (Extra-soft or Soft) solder you can, since you don't know what was used before.

Here are the flow points and silver content of Otto Frei's Silver Solder:

• *804-404 1190^oF (644^oC) 30% Silver Extra Soft (This is the only silver sheet solder we sell that contains Cadmium.)
• 804-405 1260^oF (682^oC) 45% Silver Soft (Easy)
• 804-406 1295^oF (702^oC) 65% Silver Medium
• 804-407 1375^oF (746^oC) 75% Silver Medium-Hard
• 804-408 1490^oF (810^oC) 80% Silver 20% copper Hard (IT Solder)

California Prop 65 Warning:
Cancer and Reproductive Harm. www.P65warnings.ca.gov.