In this study, the effect of mold release agent on the Environmental Stress Cracking (ESC), of plastics under injection molding application has been investigated for crack and craze initiation. Recently, polycarbonate which is used as a polymer in this study has attracted great attention due to its advantages such as high durability, impact resistance, and is more economical. During the plastic injection production process, plastics parts experience failure due to severe causes. ESC, which occurs when metallurgical, environmental, and mechanical conditions are combined. Furthermore, a plastic resin is degraded by a chemical agent in the presence of stress. So, the effects of the chemical agent and mechanical stresses cause cracking after some time. It has been determined how chemical agents' consequences critical plastic component failure. Moreover, contamination of chemical agents is an accelerating agent to plastic parts considering ESC mechanism. Molding release agents are selected for questioning as a chemical agent because they are used widely in the industries. Plastic parts that have different mechanical properties are manufactured while using different molding release agents, and craze initiation and propagation stages have been observed experimentally. Therefore, considering ESC, some chemical agents is a factor of increasing crazes to grow more rapidly.