In the extrusion of thermoplastic polymers, processing problems like melt-fracture, sharkskin, die build-up, reduced output, and poor optical properties are often noticed. With the addition of Processing Aid masterbatches these processing problems can be reduced or eliminated. Processing aids are materials that are added to improve the processability of polymeric compounds. Improved processability lowers the cost and improves the quality of the polymer. … Most used processing aids are styrenes, acrylics, calcium carbonates, lubricants, silicone oils etc.