Nsalu yagalasi ya fiber ndi mtundu wansalu wamba wopanda zopindika. Zimapangidwa ndi zinthu zamagalasi zabwino kwambiri kudzera mumitundu yambiri yosungunuka kutentha, kujambula, kuluka ulusi ndi njira zina. Mphamvu yayikulu imadalira njira ya warp ndi weft ya nsalu. Ngati mphamvu ya warp kapena weft ndi yokwera, imatha kuluka munsalu yosagwirizana. Zofunikira za nsalu zagalasi za fiber ndi alkali free glass fiber, ndipo kapangidwe kake kamakhala kopangidwa ndi mafuta owonjezera. Chifukwa cha ubwino wa ntchito yabwino yotchinjiriza komanso kukana kutentha kwambiri, nsalu yagalasi ya fiber ingagwiritsidwe ntchito ngati zomangira zomangira zamagalimoto ndi mphamvu zamagetsi. Itha kupangitsa injiniyo kupeza ntchito yabwino yotchinjiriza, kutalikitsa moyo wautumiki wagalimoto, kuchepetsa kuchuluka ndi kulemera.

Nsalu yagalasi ya fiber ndi mtundu wazinthu zopanda zitsulo zomwe zimagwiritsidwa ntchito bwino. Zili ndi ubwino wa kutchinjiriza kwabwino, kukana kutentha kwakukulu, kukana kwa dzimbiri komanso mphamvu zamakina. Nsalu yagalasi ya fiber imakhala ndi mawonekedwe osalala komanso okongola, makulidwe a yunifolomu, kufewa komanso kusinthasintha kwabwino ngakhale pamtunda wosafanana. Nsalu yowonjezeredwa yagalasi ya fiber imawombedwa ndi ulusi wowonjezera wagalasi, womwe umakhala ndi ntchito yabwino yotchinjiriza kutentha komanso kusuntha. Mitundu yosiyanasiyana yotchinjiriza imatha kupezeka mwa kusintha mawonekedwe a nsalu ndi njira yopangira. Nthawi zambiri amagwiritsidwa ntchito ngati chivundikiro chochotsa chotsekereza, bulangeti lamoto, chinsalu chamoto, cholumikizira cholumikizira ndi chitoliro cha utsi. Itha kukonza nsalu yowonjezeredwa yagalasi yophimbidwa ndi zojambulazo za aluminiyamu.