Ifomula yokubala izithako ze- I-induction furnace ramming material:

1. Ubuningi bokuhlanganisa = ukulayisha inani lenani-inani eliphelele le-ferroalloy-iron okokufaka kwensimbi esele yensimbi ebuyela esithandweni;

2. Inani lokulayisha = inani lokuthepha / isilinganiso esiphelele sokutholwa kwensimbi;

3. Inani lensimbi yensimbi = inani elengeziwe lensimbi × okuqukethwe kwensimbi × izinga lemali engenayo. Isamba sokwengezwa kwensimbi ngokuvamile sibalwa ku-4% wevolumu yokuthepha, insimbi yensimbi ingu-55%, futhi izinga lokutholwa kwensimbi Ngokusho kokuthola kabusha kwe-80%, inani eliphelele lokukhokhiswa kwemali lishintshashintsha phakathi kuka-92 ~ 96%; futhi ngokuvamile ibalwa ku-94%.