Ifomula yesichumisi ikakhulu yenziwe ngesichumisi esingaphiliyo, isichumisi esiphilayo, iminerali njalo njalo.Isichumiso se-inorganic kwisichumiso esihlanganisiweyo, esifana ne-urea sinoburhalarhume kubumba lwendandatho, umngxuma wokufa weringi kunye nomngxuma wekhowuni ongaphakathi unxitywe kabukhali yiminerali, ngoko ke imathiriyeli yokungunda kwesangqa kufuneka ikhethwe yintsimbi engenasici X46Cr13.Isichumisi esidityanisiweyo sokufa kwekhonkco likhulu ngokubanzi, liphakathi kwe-3.0-6.0mm, ngenxa ye-coefficient enkulu yokukhuhlana, umngxuma kunzima ukuwukhupha.