Ulusi wa e-glass twist ndi zipangizo zamagetsi zotetezera kutentha, nsalu zamagetsi zamafakitale ndi nsalu zina zogwiritsidwa ntchito m'mafakitale zopangira zinthu zopangira, zomwe zimagwiritsidwa ntchito pa waya woluka ndi zokutira chingwe, casing, migodi, mitundu yonse ya zipangizo zamagetsi zotetezera kutentha. Ntchito yayikulu ndi kukhazikika kwa ulusi woyambirira, kukana kuwonongeka, ndi waya wochepa wa tsitsi, mphamvu yayikulu yolimba, kutchinjiriza magetsi, kukana dzimbiri, kukana kutentha kwambiri, dzimbiri la mankhwala abwino. Mzere wokulitsa pogwiritsa ntchito zinthu zolumikizira zokhazikika ndi wowuma komanso kugwiritsa ntchito kukula kokwanira.
Ulusi wa Fiberglass umakhala ndi ulusi wa E-Glass wofanana ndi mainchesi enaake, womwe umasonkhanitsidwa pamodzi kuti upange ulusi. Kapangidwe ka ulusiwo kamakhazikika komanso kotetezedwa ndi kukula kwake komanso kupotoka pang'ono, makamaka molunjika ku Z.
