What You Need To Know About Reaction Injection Molding

It can be hard trying to find the right molding process for your part. Here’s what you need to know about reaction injection molding. Choose the right molding process for your parts.

The Basics

Reaction injection molding uses thermosetting polymers which cure within the mold. The two polymers mix at a high pressure. At a lower pressure, the mixture of polymers injects into the mold. They sit in the mold until they expand and cure into the shape of your finished product.

The Polymers

The polymers used in reaction injection molding are usually made of polyurethane, though sometimes manufacturers use other polymers, such as polyisocyanurates, polyphenols, polyesters, nylon 6, and polyepoxides. For polyurethane, reaction injection molding uses polyisocyanate and polyol, surfactant, catalyst, and a blowing agent. The raw material for creating reaction injection molding can be expensive, but the high-quality product is worth the extra cost.

The Cost

Reaction injection molding is often the best option for a given part because of its flexibility. Reaction injection molding can mold materials with thin walls, varying wall thickness, and complex internal structures. When you account for all the variables, reaction injection molding reduces costs. Sometimes, raw materials are more expensive, but reaction injection molding is overall a very cost-effective molding process. Reaction injection molding can sometimes take more time to create a product, but, when you finish the process with a strong and lightweight product, it’s worth the extra time.

The Bottom Line

Reaction injection molding is a flexible molding process that can help create your parts. It creates molding with varying wall thicknesses, thin walls, and complex geometries. It’s often the best choice for a complex product. Reaction injection molding is one of the most flexible and cost-effective molding processes on the market.

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