Amabaati aga waggulu-alumina gagabanyizibwa okusinziira ku alumina agali mu: Ekika kya III (Al2O3: 48–65%), Ekika kya II (Al2O3: 65–75%), Ekika kya I (Al2O3: 75–80%), n’Ekika eky’enjawulo (Al2O3: Ekisinga oba ekyenkana 80%).
Zigabanyizibwa okusinziira ku kika ky’ekikoomi ekikozesebwa mu: amatoffaali ga alumina aga waggulu-agaziyiza spalling-ag’ekikoomi kya seminti, amatoffaali aga low-creep high-alumina aga sitoovu ezibuguma, n’amabaati aga phosphate-bonded high-alumina agakolebwa mu kyokero ekikyukakyuka (agakozesebwa okukola ceramsite, lithium oxide, oba zinc oxide).
Okusinziira ku nkula n’ebipimo, zirimu amatoffaali agafaanana n’ekiso-alinga embazzi-, n’amabaati ag’ekika kya wedge-, awamu n’amabaati aga waggulu-alumina aga skew n’amabaati ag’ennanga.
Ebika era mulimu amatoffaali aga bulijjo, amatoffaali agakoleddwa mu ngeri ey’enjawulo, n’amabaati agakoleddwa mu ngeri ey’enjawulo.