5 Different Plastic Types Used in Injection Molding

There are various types of plastics that serve different purposes due to their unique properties. Some plastics are known for their flexibility, while others are valued for their durability. Depending on the intended purpose, one type of plastic may be more suitable than another. In this blog, we'll highlight five different types of plastics used in injection molding, their characteristics and some common applications.

What is Injection Molding?

Injection molding is a process in which molten material, such as plastic, rubber or metal, is injected into a mold, where it cools and then solidifies to form a wide range of products and components. This process is widely used for manufacturing items like automotive parts, medical devices, electronics, packaging materials, consumer goods and much more.

Types of Plastics Used in Injection Molding

Plastic injection molding, or polymer injection molding (PIM), uses different types of plastics, each selected for specific properties and suitability for various applications. Some commonly used plastics in the injection molding process include:

Polyethylene (PE)

Polyethylene (PE) is a versatile, commonly used plastic known for its durability, flexibility, resistance to moisture and chemicals, good electrical insulation, and recyclability.

• Durability: Highly durable and impact-resistant.
• Flexibility: Available in various densities, ranging from flexible (low-density) to rigid (high-density).
• Thermal Properties: Can withstand a wide range of temperatures; melting point depends on type and ranges from 220-275°F.
• Cost: Economical to produce.
• Applications: Used in products such as plastic bags, industrial materials, medical implants and prosthetics, consumer goods and more.

Polypropylene (PP)

Polypropylene (PP) is an adaptable, widely used plastic known for its durability, chemical resistance, low density, thermal stability, and recyclability.

• Durability: Highly durable and impact-resistant.
• Flexibility: Moderately flexible.
• Thermal Properties: Can withstand a wide range of temperatures; melts at around 320-338°F.
• Cost: Generally economical to produce.
• Applications: Used in products such as packaging materials, automotive parts, medical instruments, construction materials, textiles, and household goods.

Acrylonitrile Butadiene Styrene (ABS)

Acrylonitrile Butadiene Styrene (ABS) is a tough, impact-resistant plastic known for its durability, and ease of processing.

• Durability: Highly durable and impact-resistant.
• Flexibility: Moderately flexible with good toughness.
• Thermal Properties: Good thermal stability; can withstand temperatures up to around 210°F.
• Cost: Relatively economical to produce.
• Applications: Used in automotive parts, consumer electronics, toys, medical device housings, surgical instruments and household goods.

Polyethylene Terephthalate (PET)

Polyethylene Terephthalate (PET) is a strong, lightweight plastic known for its excellent moisture resistance, clarity, and recyclability.

• Durability: Durable and impact-resistant.
• Flexibility: Moderately flexible.
• Thermal Properties: Can withstand temperatures up to around 250°F.
• Cost: Economical to produce and widely used.
• Applications: Used in beverage bottles, food packaging, medical packaging, synthetic fibers in textiles, and more.

Polycarbonate (PC)

Polycarbonate (PC) is a strong, transparent plastic known for its impact resistance, optical clarity, and high thermal stability.

• Durability: Extremely durable and impact-resistant.
• Flexibility: Rigid with high toughness.
• Thermal Properties: Has excellent thermal stability and can withstand temperatures up to around 300°F.
• Cost: Higher cost compared to other plastics due to its superior properties.
• Applications: Used in eyewear lenses, medical devices, laboratory equipment, automotive components, construction materials, and electronic housings.

It is important to choose the right type of plastic based on the specific application to ensure optimal performance. Equally important is selecting the right molding partner; working with the right precision injection molding manufacturer gives you the benefit of having an expert on your side to provide recommendations and guidance on the most suitable plastic for your molding project.

Dynamic Group is a dependable partner for countless manufacturers worldwide when it comes to developing and creating critical components and products. We utilize our customized processes and comprehensive molding and tooling capabilities to ensure successful product launches while staying within budget.

Dynamic Group is a trusted provider of the most critical components to the world's leading medical device manufacturers. As leaders in innovative design solutions for complex Plastic and MIM molds, our extensive molding and tooling capabilities allow us to operate as a reliable, high-performing extension of your organization. Focusing on creating world-class value for our partners, we cultivate relationships to ensure successful product launches within budget.

Request a quote today and take the first step in your next design. Our expert team is here to provide tailored solutions that meet your specific needs.