Mu siketi ya sukulu yopangidwa ndi polyester yomatira ku United States, nsalu yodziwika bwino ndi nsalu yopota yomatira yosakanikirana ndi polyester. Nsalu iyi imapangidwa ndi polyester fiber (polyester) ndi viscose fiber (yomatira) ndipo ili ndi zinthu zambiri zabwino kwambiri. Tikufuna kukuwonetsani nsalu za rayon za 65 polyester 35 zomwe zakhala zikupemphedwa nthawi zonse ndi makasitomala athu odziwika bwino aku America. Nsalu izi zimapangidwa kuti zigwiritsidwe ntchito popanga yunifolomu ya sukulu, zomwe zimathandiza ophunzira a m'masukulu am'deralo kukhala ndi yunifolomu yosalala.