Injection Molding vs. Casting Urethane
When comparing injection mold vs cast processes, there are many things to consider. While injection molding can be cost effective when producing larger quantities, injection-molded polymers do not offer the superior physical properties of open-cast thermoset polyurethane. That’s because the hot cast process provides a long slow cure and post cure that enhances the cross-linking of the polyurethane molecule, something that cannot be accomplished in the relatively short processing time associated with injection molding.
So, although producing open-cast thermoset polyurethane components may be more labor intensive, the result is a greater range of physical properties which translates into better overall performance in the long run, as well as significant cost savings.