Reaction injection molding is a simple concept. As its name suggests, the process is based on a chemical reaction. A reactive liquid mixture (usually polyol and isocyanate) is injected or poured into a mold where a chemical reaction takes place. After an exothermic (heat generating) reaction occurs, the finished part is removed from the mold. Depending on the chemical formulation, the end product can take on a wide range of physical characteristics: foam or solid, highly rigid or very flexible. Nitrogen is used in the process to keep the chemicals dry and oxygen free.
This compact system of nitrogen generation is ideally suited for high flow applications that presently employ liquid nitrogen bulk delivery systems.