Reinforced reaction injection molding (RRIM) requires precise metering equipment to combine two or more reactive polymers, typically a polyol and isocyanate. Glass fiber is then incorporated into the polyol mixture to enhance mechanical properties improving strength, durability, and impact resistance. Once thoroughly combined using a high-pressure impingement mixing process, the reactive mixture is injected into a pre-heated mold, usually made of high-grade aluminum or steel to accommodate the pressure of injection and higher exotherm temperatures. After fully curing, the part is removed from the mold for subsequent processing and finishing.