Highest concentration high molecular weight hindered amine based UV light stabilizer masterbatch of superset quality containing 20% of the effective substance in polyolefin carrier resin. It increases the working life of film and mainly molding product like PP, HDPE tapes. It provides excellent performance in outdoor applications. This masterbatch shows comaptibility with LLDPE, HDPE, PP, ABS/SAN. PS/HIPS polymer systems.