Insimbi ethambile ilungele izinto ze-valve, ngoba inezinzuzo eziningi. Njengengxenye yensimbi, insimbi ethambile yasungulwa ngo-1949. Okuqukethwe kwekhabhoni kwensimbi ethambile kungaphansi kuka-0.3%, kuyilapho okwensimbi ethambile kanye nensimbi ethambile okungenani kungu-3%. Okuqukethwe kwekhabhoni okuphansi kwensimbi ethambile kwenza ikhabhoni ekhona njenge-graphite yamahhala hhayi ukwakha ama-flakes. Uhlobo lwemvelo lwekhabhoni ensimbini ethambile yi-graphite flakes yamahhala. Ensimbini ethambile, i-graphite isesimweni sama-nodules kunokuba ama-flakes njengasensimbini ethambile. Uma kuqhathaniswa nensimbi ethambile kanye nensimbi ethambile, i-ductile insimbi inezakhiwo ezingcono zomzimba. Yizinhlayiya eziyindilinga ezivimbela ukudalwa kwemifantu, ngaleyo ndlela zinikeze i-ductility ethuthukisiwe enikeza i-alloy igama layo. Kodwa-ke, i-flake ensimbini ethambile iholela ekushodeni kwe-ductility yensimbi. I-ductility engcono kakhulu ingatholakala nge-ferrite matrix.

Uma kuqhathaniswa nensimbi ephothiwe, insimbi ephothiwe inezinzuzo eziphelele ngamandla. Amandla okubamba ensimbi ephothiwe angama-60k, kanti awensimbi ephothiwe angama-31k kuphela. Amandla okukhiqiza ensimbi ephothiwe angama-40k, kodwa insimbi ephothiwe ayibonisi amandla okukhiqiza futhi izoqhekeka ekugcineni.

Amandla ensimbi ethambile afana nawensimbi ephothiwe. Insimbi ethambile inamandla aphezulu okukhiqiza. Amandla aphansi kakhulu okukhiqiza ensimbi ethambile angama-40k, kanti amandla okukhiqiza ensimbi ethambile angama-36k kuphela. Eziningi zezicelo zikamasipala, njengamanzi, amanzi anosawoti, umusi, ukumelana nokugqwala kanye nokumelana nokushiswa kwensimbi ethambile kuphakeme kunensimbi ephothiwe. Insimbi ethambile yaziwa nangokuthi insimbi ye-spheroidal graphite. Ngenxa yesakhiwo se-spheroidal graphite, insimbi ethambile ingcono kunensimbi ephothiwe ekunciphiseni ukudlidliza, ngakho-ke ilungele kakhulu ukunciphisa ukucindezeleka. Isizathu esibalulekile sokukhetha insimbi ethambile njengezinto ze-valve ukuthi inezindleko eziphansi kunensimbi ephothiwe. Izindleko eziphansi zensimbi ethambile zenza le nto ithandwe kakhulu. Ngaphandle kwalokho, ukukhetha insimbi ethambile kunganciphisa izindleko zomshini.