The technology of Polyurethane Reaction Injection Molding was developed during the 1960s and was mainly used for manufacturing high-density polyurethane foam parts such as bumpers for the automotive industry. Since then RIM has technology has evolved dramatically into an efficient manufacturing process as product designers and manufacturers have learned to apply the unique capabilities and benefits of RIM to a variety of industries.
We work with multiple suppliers of the major polyurethane components for reaction injection molding – Polyols and Isocyanates. Polyol determines the physical characteristics of the part, including density, strength, flex modulus and color. Isocyanate (ISO) reacts with the Polyol to form a thermoset polyurethane plastic. Their strength is in formulating these separate components into polyurethane systems containing the right Isocyanate and Polyol to produce the processing and physical properties you need.
Foam – Foamed polyurethanes use blowing agents to form a sandwich of high-density rugged skin and a lower density cellular core.
Solid – Solid polyurethanes are processed without blowing agents to form a homogeneous flexible or rigid plastic.
Composite – Composite systems can be foamed or solid, rigid or elastomeric, but are molded with fiber reinforcements, such as glass, mica, quartz, calcium carbonate, or aluminum oxide to enhance the structural properties of the molded part. Stiffness and impact strength are enhanced by adding reinforcement in the material stream, (Reinforced RIM – RRIM), or by using a molded perform in the mold that is encapsulated, (Structural RIM – SRIM).