Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 296
Alloy For Pattern Letters And Figures.
Оглавление—A good alloy for casting pattern letters and figures and similar small parts of brass, iron, or plaster molds, is made of lead 80 parts, and antimony 20 parts. A better alloy will be lead 70 parts, antimony and bismuth each 15 parts. To insure perfect work the molds should be quite hot by placing them over a Bunsen burner.
