Seongju Industries

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Northville, MI

At Seongju Industries, we specialize in delivering high-performance solutions through precision injection molded plastics and custom rubber molding. Drawing on decades of engineering experience, we partner with customers across a wide range of industries to develop durable, dimensionally accurate components that meet exacting specifications. Whether we're working with advanced thermoplastics or a complex rubber formulation, we approach every project with a focus on consistency, quality, and speed to market. Our in-house capabilities allow us to manage the entire process—from material selection and mold design to production and post-molding services—ensuring tight tolerances and repeatable results. We understand the critical role these components play in the performance of our customers' products, and we take pride in producing parts that hold up in the most demanding environments. By combining deep technical expertise with flexible manufacturing capacity, we deliver parts that meet both performance goals and production deadlines.

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Injection Molded Plastics Power Pages

Overmolding

Many of the products used daily are made possible by producers and suppliers of rubber and plastic. These substances are robust, adaptable, and capable of practically any shape required for various industrial purposes…

Plastic Gears

A plastic gear is a toothed wheel made up of engineering plastic materials that work with others to alter the relation between the speed of an engine and the speed of the driven parts. The engineering plastic materials used in manufacturing plastic gears can be…

Plastic Injection Molding

Plastic injection molding, or commonly referred to as injection molding, is a manufacturing process used in the mass fabrication of plastic parts. It involves an injection of molten plastic material into the mold where it cools and…

Reaction Injection Molding (RIM)

Reaction injection molding, often referred to as RIM molding, is a specialized molding technique that utilizes two highly reactive, low molecular weight chemicals. These chemicals are combined and blended before being injected into a closed mold…

Plastic Overmolding

Plastic overmolding is a manufacturing process that involves combining two or more plastic materials to create a single, unified part. The process enhances the functionality, durability, and aesthetics of plastic components by…

Thermoplastic Molding

Thermoplastic molding is a manufacturing process that works to create fully functional parts by injecting plastic resin into a pre-made mold. Thermoplastic polymers are more widely used than thermosetting…

Additive Manufacturing (AM)

Additive manufacturing (AM) or additive layer manufacturing (ALM) is a three-dimensional printing process that produces components and parts by adding layers of material to fabricate physical renderings of computer designs. The multiple layers of additive

Blow Molding

Blow molding is a type of plastic forming process for creating hollow plastic products made from thermoplastic materials. The process involves heating and inflating a plastic tube known as a parison or preform. The parison…

Rotational Molding

Rotational molding, commonly referred to as “rotomolding”, is a plastic casting technique used to produce hollow, seamless, and double-walled parts. It uses a hollow mold tool wherein the thermoplastic powdered resin is heated while being rotated and cooled to solidify…

Polyurethane Molding

Polyurethane molding is the process of fabricating or manufacturing plastic parts by introducing a urethane polymer system into a tool or mold and allowing it to cure. Like any other type of plastic, the excellent processability…

Polyurethane Rollers

Polyurethane rollers are cylindrical rollers covered by a layer of elastomer material called polyurethane. Depending on the application, the inner roller core is prone to scratches, dents, corrosion, and other types of damage…

Urethane Casting

Urethane casting is the process of injecting polyurethane and additive resins into a soft mold usually made of silicone elastomer. The casting process is similar to injection molding; injection molding differs by using hard, metal molds…

Seongju Industries