Reinforced reaction injection molding mold design

The formulations given below (in parts by weight) are three examples of typical formulations from the many available, which have been designed to meet specific requirements. Noteworthy points reading the formulations are explained. An example of formulation for reaction injection molding (RIM) and reinforced reaction injection molding (RRIM) is also given,... 

Competitive penetration of polypropylene into other applications has primarily taken place in polyethylene, polystyrene, polyvinyl chloride (PVC), thermoplastic polyester, nylon-6 or -6/6, and sometimes directly from metals or thermoset polymers like phenolic or reinforced reaction injection molded (RIM) urethane. The reasons for market penetration by PP replacement vary widely with an assortment of material design options chemical resistance, heat resistance, recycleability, processability, economics, and aesthetics. 

Recent advances in poly (urethane) reinforced reaction injection molded (RRIM) parts has led to use in components such as fenders for small trucks, low-density interior door panels, and higher heat-resistant body panels. Rear fenders on the Chevrolet Silverado and the GMC Sierra trucks (Fig. 2), made of RRIM polyurea, are the first application of a RRIM polymer designed to withstand electrocoat, primer, and topcoat paint line process temperatures. 

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