Stearic Acid is one of the most common non-toxic and saturated fatty acids, containing 18 carbon atoms of the main chain found in vegetable and animal fats. Its main constituents are mainly stearic and palmitic. these parameters are shown by the numbers C18 and C16 in the analyzes. Due to the amount of stearic and palmitic acid in the material, the grade of stearic acid is determined and its market is known. In the plant grade, the raw material of stearic acid is palm oil, which is mainly found in some countries in Southeast Asia. In Stearic acid production, decomposition, separation, concentration and hydrogenation are performed. the regeneration process is performed under vacuum and at this stage, the light components and the unpleasant odor of the oil are eliminated. usually, animal-based stearic acid has an unpleasant odor. In the process of hydrogenation, which is one of the main stages of stearic acid production and is done to saturate fatty acids, the iodine number of stearic acid is determined and its purity is determined. a high iodine value indicates a large amount of unsaturated fatty acids. the lower the iodine number, the better the stearic acid quality and therefore the purer it is. Applications: In the plastic industry, it is used as a softener, lubricant, stabilizer in the production of products such as masterbatch, PVC films, pipes, door and window profiles, granules, etc. it is used as a raw material in anti-foam materials, mold separators, softeners and waterproofs. it is used in the production of health cosmetics, metal stearate, as well as in the rubber industry, candle production, etc. Stearic Acid is also used as an additive in important and widely used polymers such as PVC.PP.PE.