Microcellular injection molding, known commercially as the MuCell® process, is capable of mass-producing parts with complex geometries and excellent dimensional stability, and is widely used in automotive, electronic/electrical products, construction, outdoor products and many other applications. In this process, supercritical fluid (SCF), usually nitrogen (N2) or carbon dioxide (CO2), is mixed with polymer melt to create a single-phase polymer/gas solution, which is then injected into the mold cavity, and finally bubbles are formed in the product.