INJECTION MOLDING works with thermoplastics like polyethylene, polypropylene which is a dominant plastic product manufacturing technique today. Injection Molding can also use termosetting resins like epoxies and polyesters with a special reactive configuration. Reinforcements are added to improve stiffness, tensile strength and tensile elongation and to reduce shrinkage, thermal expansion, droop and sag. Milled fibers, minerals, fillers or flakes are widely used and can be added directly to the resin.
Presently, transportation is the principal market for Injection Molding products. Automotive and truck applications for RIIM parts include Class A body panels, fascia, bumper beams, spare tire covers, floor pans and other similar products. The advent of controllable reactivity resins such as polyuria/amide has introduced a trend toward larger machines, larger clamps and larger parts. Very large Injection Molding molded parts weighing over 100 pounds have already been produced. Breakthrough applications such as this clearly indicate that the future trend in Injection Molding products will be toward increased market acceptable featuring larger and more sophisticated parts.