Mndandanda wa 4000 nthawi zambiri umakhala ndi silicon pakati pa 4.5% ndi 6%, ndipo kuchuluka kwa silicon kumapangitsanso mphamvu. Malo ake osungunuka ndi otsika, ndipo amakhala ndi kutentha kwabwino komanso kukana kuvala. Amagwiritsidwa ntchito kwambiri pazomangira, zida zamakina, etc.

5000 mndandanda, wokhala ndi magnesium ngati chinthu chachikulu, amathanso kutchedwa magnesium aluminium alloy. Nthawi zambiri amawonedwa m'makampani, ali ndi kachulukidwe kakang'ono, mphamvu zolimba kwambiri, komanso kutalika kwabwino.

Mndandanda wa 6000, wokhala ndi magnesium ndi silicon monga zinthu zazikuluzikulu, zimayang'ana kwambiri mndandanda wazinthu zinayi ndi zisanu, zoyenera pazochitika zomwe zimakhala ndi dzimbiri komanso makutidwe ndi okosijeni.

7000 mndandanda, makamaka munali nthaka element, ndi wa zinthu zotayidwa ndege, akhoza kutentha mankhwala, ndi superhard zotayidwa aloyi, ndipo ali bwino kuvala kukana.

8000 mndandanda, womwe ndi aloyi dongosolo zina kuposa pamwamba, ndi wa mndandanda zina ndipo makamaka ntchito zotayidwa zojambulazo kupanga.