Cov tshuaj pleev thaiv hnub thiab cov mis tshuaj uas nquag siv yuav raug oxidation, ua rau xim hloov, sib cais, lossis poob qhov SPF zoo. Kev ntim khoom yog qhov tseem ceeb rau kev tiv thaiv cov tshuaj pleev ib ce thiab tshuaj tiv thaiv kev ntxhov siab ntawm ib puag ncig xws li oxygen, noo noo, thiab UV. Tsib txheej raj qauv yooj ywm muab kev tiv thaiv zoo heev, ua rau lawv zoo tagnrho rau cov khoom rhiab heev xws li tshuaj pleev thaiv hnub, tshuaj pleev qhov ncauj, thiab kev saib xyuas tawv nqaij zoo. EVOH (Ethylene Vinyl Alcohol) ntxiv ib txheej thaiv nruab nrab uas tiv thaiv koj cov mis tshuaj thoob plaws nws lub txee lub neej.