I-Optical brightener i-OB-1 yi-optical brightener ye-polyester fiber, kwaye isetyenziswa ngokubanzi kwi-ABS, i-PS, i-HIPS, i-PC, i-PP, i-PE, i-EVA, i-PVC eqinile kunye nezinye iiplastiki. Ineempawu zesiphumo esihle kakhulu sokwenza mhlophe, uzinzo oluhle kakhulu lwe-thermal njl.