Ikirahure gikonje cyangwa ikirahure gikarishye, bikozwe no gushyushya ikirahuri gifatanye ku bushyuhe bwa dogere 650 ° C (1200 ° F) hanyuma bigakonjeshwa vuba n'umwuka.Ubu buryo bufunga hejuru yikirahure muri compression yo kwikuramo byongera imbaraga zikirahure.Iyo ushizemo neza iki kirahure gikubye inshuro enye kurenza igice cyikirahure gifatanye.
Icy'ingenzi cyane, iyo umujinya ucitse ucamo ibice bito bifatwa nkicyitegererezo.