This kit contains a sampling of three different flowing silver wire solders, Easy, Medium & Hard. Each length of wire weighs approximately 1.66 Pennyweights making for a total of approximately 5 dwt or 1/4 troy ounce.
The terms Extra Easy-Easy-Medium-Hard are used to describe the relative temperature flow points between one type or more specifically, one brand of hard solder. Extra Easy will have a lower flow point than Easy, which will have a lower flow point than Medium, which will have a lower flow point than Hard. 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 will flow. Generally, the higher the flow point temperature, the higher the silver content of the solder. The higher the silver content of a silver solder, the better the solder will match the color of the silver, and theoretically, the stronger the bond.
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 Easy) 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 Wire Solder Kit:
- 804-401 1325 F (719oC) Easy Flow
- 804-402 1390 F (755oC) Medium Flow
- 804-403 1475 F (802oC) Hard Flow
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