Nsalu yopangidwa ndi chikopa yopanda ulusi yoyenera nsalu yopangidwa ndi chikopa nthawi zambiri imapangidwa ndi ulusi wa polyester (PET). Kulemera kwake nthawi zambiri kumakhala pakati pa 40 ndi 150g/㎡. Pa zinthu zachikopa wamba, 80 mpaka 120g/㎡ imasankhidwa. Pa nsalu zachikopa zomwe zimakhala ndi mphamvu zambiri monga katundu ndi mkati mwa galimoto, kulemera kwake kumatha kufika 120 mpaka 150g/㎡. Mtundu ndi mawonekedwe ake zimatha kusinthidwa.
