Top 10 Injection Molding Materials: A Guide for Your Projects

As an experienced injection molding manufacturer, we understand that choosing the right resin is crucial for the success of your project. There isn’t a one-size-fits-all answer, but understanding the properties of different materials can help you make an informed decision. Let us share insights into ten popular injection molding materials, their properties, and common applications.

1. Nylon (PA)

Nylon (PA) injection molding

Nylon is known for its strength and durability, making it ideal for mechanical parts like bushings, gears, and bearings. Widely used in the automotive industry, it reduces weight and cost compared to metal alternatives. However, it absorbs water, which limits its use in marine applications.

2. Acrylic

Acrylic injection molding

Acrylic is used for transparent parts such as windows, screens, and lighting equipment. It’s a great alternative to glass due to its high tensile strength, weather resistance, and scratch resistance. Acrylic also takes dyes well, making it suitable for aesthetic applications.

3. Polycarbonate (PC)

Polycarbonate (PC)

Polycarbonate is another clear resin with excellent optical properties and durability. It provides precise dimensional control and is stronger than acrylic. However, producing optically clear parts requires highly polished mold tools, which can increase costs.

4. Polyoxymethylene (POM)

Polyoxymethylene (POM)

POM, or acetal, is a strong, tough, and rigid material used for mechanical and automotive parts like gears and fasteners. It has high resistance to solvents but should not be exposed to hydrochloric and nitric acids.

5. Polystyrene (PS)

Polystyrene (PS)

There are two types of polystyrene: High Impact Polystyrene (HIPS) and General Purpose Polystyrene (GPPS). HIPS is tough and durable, making it suitable for toolboxes and power tool bodies. However, it is not environmentally friendly.

6. Acrylonitrile Butadiene Styrene (ABS)


ABS is a common engineering-grade plastic known for its toughness, impact resistance, and ease of molding. It’s used in electronic parts, such as phone adapters and keyboard keys, due to its insulating properties and low melting temperature.

7. Polypropylene (PP)


Polypropylene is widely used in food storage and packaging due to its chemical resistance and ability to withstand hot water washing. It’s flexible, easy to recycle, and ideal for making live hinges that bend without tearing.

8. Polyethylene (PE)

Polyethylene (PE)

Polyethylene is a lightweight, inexpensive material with high chemical resistance and elasticity. It’s found in consumer plastic parts like milk bottles, trash cans, and toys. Though not the strongest material, it’s non-toxic and durable.

9. Thermoplastic Polyurethane (TPU)

Thermoplastic Polyurethane (TPU)

TPU is soft, elastic, and has great tensile and tear strength, making it ideal for parts requiring rubber-like properties. It’s used in protective wire and cable sheaths and improves grip for handheld products. Although more expensive, it’s irreplaceable for certain applications.

10. Thermoplastic Rubber (TPR)

Thermoplastic Rubber (TPR)

TPR is a blend of plastic and rubber, offering excellent chemical and weather resistance. It’s used in fluid dispensers, flexible hoses, and medical catheters. TPR, also known as thermoplastic elastomer (TPE), is recyclable and versatile.


Understanding the properties and applications of these common injection molding materials can help you choose the right resin for your project. Whether you need strength, flexibility, or chemical resistance, there’s a material that fits your needs.

Ready to start your next manufacturing project? Contact us for a quote today and let’s collaborate to bring your vision to life!