Some such as Polystyrene (PS) are easily compressed and forced into a mold under pressure due to the relatively large space between molecules. Various plastics react in a different way to pressure. Some of the other variables that influence viscosity are pressure, temperature, relative molecular weight, and shear rate. ![]() Higher viscosity indicates a resistance to flow, such as the colder syrup. Syrup, especially at colder temperatures, doesn’t flow well. Think of two fluids on opposite ends of viscosity: thick syrup and water. Viscosity, as defined as the measurement of a substance’s resistance to motion under an applied force, is one of the most important variables in injection molding. What Variables Influence Viscosity in Injection Molding? It’s a variable that takes skill and knowledge to control for consistent high quality with reduced operating costs. Controlling viscosity ensures a consistent and uniform product, but controlled viscosity isn’t the result of turning a knob or pushing a button. In truth, viscosity may be more critical to have success with injection molding. Temperature and pressure are probably the two most common variables thought of to control the quality of injection. Many things can affect the end result of injection molding.
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