20mm crominim-toptinum aluminium septaum septa nthawi zambiri amatanthauza mtundu wa kutsekeka komwe amagwiritsidwa ntchito mu ma labotale. Ili ndi kapu ya aluminium yophatikizidwa ndi septa.
Kapamwamba ka aluminiyamu kumapangidwa kuti asindikize chitseko, monga vial kapena botolo, ndipo nthawi zambiri amapangidwa ndi aluminium kapena aluminium.
Imapereka kutseka kotetezeka kuti muchepetse kutaya, kuipitsidwa, kapena kusintha kwa zomwe zili.
Chipewa cha alumini thalumu chimapangitsa kukhala otetezeka, pomwe septa ya mphira imapereka chotchinga choletsa kutayikira, kuipitsidwa, ndi kusinthasintha.