Ndi chidwi chochulukirachulukira pachitetezo chamoto komanso kuzindikira zachitetezo cha chilengedwe, ulusi wa rayon woletsa moto (ulusi wa viscose) watulukira, makamaka m'makampani opanga nsalu ndi zovala. Kugwiritsa ntchito ulusi woletsa moto wa rayon kukuchulukirachulukira. Sizingangowonjezera chitetezo cha zinthu, komanso kukwaniritsa zosowa za ogula. Ma retardants a malawi a FR rayon fibers amagawidwa makamaka kukhala silicon ndi phosphorous mndandanda. Silicon series flame retardants imapeza zotsatira zochepetsera moto powonjezera siloxane ku ulusi wa rayon kuti apange masinthidwe a silicate. Ubwino wawo ndi wokonda zachilengedwe, wopanda poizoni, komanso kukana kutentha kwabwino, zomwe nthawi zambiri zimagwiritsidwa ntchito pazinthu zoteteza kwambiri. Phosphorus based retardants of flame retardants amagwiritsidwa ntchito kupondereza kufalikira kwa malawi powonjezerapo phosphorous based organic compounds ku rayon fibers ndikugwiritsa ntchito makutidwe ndi okosijeni a phosphorous. Amakhala ndi maubwino otsika mtengo, kugwiritsa ntchito bwino moto woyaka moto, komanso kusamala zachilengedwe, ndipo nthawi zambiri amagwiritsidwa ntchito popanga nsalu zopanda nsalu.