Soft German-silver Solder.—
| I.— | Copper | 4.5 parts |
|---|---|---|
| Zinc | 7 parts | |
| Nickel | 1 part | |
| II.— | Copper | 35 parts |
| Zinc | 56.5 parts | |
| Nickel | 8.5 parts | |
| III.— | German silver | 5 parts |
| Zinc | 5 parts |
Compositions I and II have analogous properties. In composition III “German silver” is to be considered as a mixture of copper, zinc, and nickel, for which reason it is necessary to know the exact composition of the German silver to be used. Otherwise it is advisable to experiment first with small quantities in order to ascertain how much zinc is to be added. The proper proportion of German silver to zinc is reached when the mixture reveals a brilliancy and condition which renders it possible to barely pulverize it while hot. A small quantity when brought in contact with the soldering iron should just fuse.
Hard German-silver Or Steel Solder.—
| I.— | Copper | 35 parts |
|---|---|---|
| Zinc | 56.5 parts | |
| Nickel | 9.5 parts | |
| II.— | Copper | 38 parts |
| Zinc | 50 parts | |
| Nickel | 12 parts |
Composition I requires a fairly high temperature in order to be melted. Composition II requires a blow pipe.
Gold Solders:
Hard Solder For Gold.
I.—For 24-carat gold: Twenty-two parts gold (24 carat), 2 parts silver, and 1 part copper; refractory.
II.—For 18-carat gold: Nine parts gold (18 carat), 2 parts silver, and 1 part copper; refractory.