This study targeted the effect of the addition of filler (zeolite) to polyethylene polymer. This filler was used as a filler with local polyethylene and produced by Ras Lanuf Oil, Gas Manufacturing Company and LLDPE type LLF-181N. The zeolite was grinded and quantified and the granule size and composition of polyethylene mixtures with zeolite were determined by different percentages (5, 10, 15, 20, 30)%. The mixing process was done by the Two Roll Machine. - Mechanical properties showed that the best ratios of addition of zeolite with linear low density polyethylene are from 10% to 20%. - The results of thermal analysis of filler (zeolite) with polyethylene were the highest point of crystalline melting point of zeolite at 15%. - As a result of exposure of plastic material to changing environmental conditions, the environmental stress cracking test was conducted for low density linear polyethylene mixtures with zeolite. The results showed that all mixing ratios did not break