Reaction Injection Molding (RIM) can produce strong, flexible, lightweight parts which can easily be painted. It also has the advantage of quick cycle times compared to typical vacuum cast materials. The bi-component mixture injected into the mold has a much lower viscosity than molten thermoplastic polymers, therefore large, light-weight, and thin-walled items can be successfully RIM processed. This thinner mixture also requires less clamping forces, which leads to smaller equipment and ultimately lower capital expenditures. Another advantage of RIM processed foam is that a high-density skin is formed with a low-density core. The disadvantages are slow cycle times, compared to injection molding, and expensive raw materials.
Reaction Injection Molding is suitable for low volumn production, simple structure but large cover, medical device cover and household implements. RIM technology gives designers a broader space for molding. The advantages of beautiful lines, high level surface, the integrity of product structure, good auccuracy and stability that bonding technology can not match.