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The 10 Most Popular Plastic Pellet Combinations For Injection Molding

Explore diverse plastic pellet combinations for injection molding to enhance product quality. Discover material options and benefits for various applications.

The types of plastic pellet combinations that you use in injection molding can make a huge difference in the overall quality. It also affects the performance and cost of your finished products.

As manufacturers, we understand that you are always looking for innovative ways to produce better goods at lower costs. This is why we have taken some time to identify the top 10 most common and useful plastic pellet combinations currently in use.

In this article, we will take a closer look at each of these different plastic pellet combinations. We will explain their properties, advantages, and when they should be used. Continue reading for helpful insights that you can apply to your injection molding techniques and projects.

Colorful plastic pellets in zigzag shaped metal trays

Best Pellet Blends

  1. Polypropylene (PP) and Glass Fibers

Overview: Polypropylene (PP) is the most widely available and versatile plastic providing excellent chemical resistance and mechanical properties. Incorporating glass fibers into polypropylene enhances the rigidity and strength of the plastic.

Advantages: Glass fiber reinforcement enhances heat resistance and dimensional stability.

Uses: Typically used in industrial components, household items, and automotive components where strength and heat resistance are needed.

  1. Polycarbonate (PC) and Acrylonitrile Butadiene Styrene (ABS)

Description: PC is a transparent material with high impact resistance, and ABS is a tough material that is easy to process. The combination of these two materials produces a strong blend with superior mechanical properties.

Benefits: Improved toughness, impact strength, and premium aesthetic finish. This combination is ideal for demanding products requiring durability and appearance.

Applications: Typically used in electronic enclosures, helmets, and car interiors where strength and appearance are required.

  1. Nylon (PA) and Carbon Fibers

Description: Nylon (PA) is a tough and flexible plastic material with excellent resistance to wear. Reinforcing Nylon with carbon fibers improves its mechanical properties.

Benefits: Carbon fibers enhance the tensile strength, stiffness, and thermal stability of Nylon. This combination is suitable for high-performance applications.

Applications: Widely used in aerospace parts, sports goods, and mechanical components.

Black pipe made of nylon and carbon fibers
  1. Acrylonitrile Butadiene Styrene (ABS) and Polybutadiene

Description: ABS plastic is a rigid, impact-resistant plastic material, and Polybutadiene is added to enhance the impact resistance and flexibility.

Benefits: Enhanced impact resistance and flexibility, making this material best suited for tough and durable applications.

Applications: Toys, automotive trims, and consumer electronics.

  1. Polyethylene (PE) and Calcium Carbonate

Description: Polyethylene (PE) is the most widely used plastic and is a versatile, 100% recyclable thermoplastic material. Calcium Carbonate is added to enhance the stiffness and reduce the material cost.

Benefits: Increased stiffness, lower cost, and improved processability, making this material economical and efficient.

Applications: PE with Calcium Carbonate is widely used in packaging, containers, and agricultural films.

  1. Polyvinyl Chloride (PVC) and Plasticizers

Description: Polyvinyl Chloride (PVC) is a rigid plastic material, and Plasticizers are additives that enhance the flexibility and softness of the material.

Benefits: Enhanced flexibility, softness, and overall durability of the material, making this combination best suited for applications where flexibility is key.

Applications: Medical tubing, cables and flooring

Stack of white PVC pipes with varying diameters
  1. Polystyrene (PS) and Butadiene

Description: Polystyrene (PS) resin is a clear and stiff engineering plastic. Butadiene is added to improve impact and toughness properties.

Benefits: It offers good toughness, impact, and clarity, which makes this thermoplastic blend suitable for both functional and aesthetic purposes.

Applications: Commonly used in disposable tableware and containers as well as appliance covers.

  1. Polyethylene Terephthalate (PET) and Glass Fibers

Description: PET is a rigid plastic material with excellent mechanical properties, and glass fiber is added to reinforce the mechanical properties of the final product.

Benefits: It features excellent mechanical strength, dimensional stability, and thermal resistance.

Applications: This thermoplastic blend is extensively used in the beverage bottle industry as well as automotive and electronic applications.

  1. Polybutylene Terephthalate (PBT) and Mineral Fillers

Description: PBT is a semi-crystalline engineering plastic with excellent mechanical properties. Mineral fillers are added to reduce the shrinkage of PBT.

Benefits: It offers stiffness, dimensional stability, and shrinkage improvement.

Applications: Commonly used in electrical parts, automotive connectors, and industrial machinery.

White polybutylene terephthalate PBT pellets on a blue background
  1. Polyamide (PA) and Flame Retardants

Description: Polyamide (PA) plastic, commonly referred to as Nylon, is an engineering plastic with excellent mechanical properties. Flame retardants are added to improve the flame resistance of Nylon.

Benefits: It offers good fire resistance, safety, and durability, which makes this thermoplastic blend suitable for critical applications.

Uses: This material is used in a wide range of electrical housings and enclosures, automotive applications, and consumer electronics.

Advances in Injection Molding Technology and Techniques

Injection molding is nothing new to the manufacturing industry. It’s been around for decades and continues to be one of the most popular methods for producing high-quality parts at high volumes.

However, recent technology updates and advancements have transformed the industry. It has made injection molding faster, more accurate, and more diverse than ever before. Here are some of the latest updates and techniques that are changing the future of injection molding.

  1. 3D Printing Integration

By far, one of the greatest updates to the injection molding process is the combination of injection molding with 3D printing. This emerging hybrid technology combines the best of both worlds: the speed of 3D prototyping with the mass production capabilities of injection molding.


  • Speed Prototyping: 3D print prototypes fast so designers can iterate quickly and put out products to market faster.
  • Affordable: 3D printed tools allow manufacturers to run short runs without the expense of mold making.
  • Personalization: Produce personalized parts without the expense of retooling.
A 3D printer creating a blue object


  • Medical Devices: Custom prosthetics and medical tools.
  • Automotive: Quickly develop customized parts and components.
  • Consumer Products: Product customization that matches the needs and wants of each consumer.

2. Advanced Materials

The creation of superior materials has pushed the boundaries of injection molding. Advanced materials range from high-performance thermoplastics to bio-degradable polymers and composites.


  • Performance: Materials can deliver higher strength, heat resistance, and durability.
  • Sustainability: Bio-degradable polymers and recyclable materials provide solutions for environmental challenges and enable manufacturers to adopt sustainable practices.
  • Functionality: Materials with special characteristics – such as conductive polymers or self-healing materials – offer new opportunities for highly functional end parts.


  • Aerospace: High-performance parts that are able to resist the most extreme operating conditions.
  • Electronics: Lighter, tougher casings and components

3. Automation and Smart Manufacturing

Automation is already changing the injection molding industry, making the manufacturing process more efficient and reducing the human factor. Smart manufacturing encompasses using sophisticated robotics, sensors, and data analytics to streamline injection molding production.


  • Efficiency: As a human workforce is mostly substituted with automated systems, the latter can run 24/7 with minimal supervision.
  • Precision: Making use of sophisticated robotics and sensors ensures high accuracy and repeatability rates.
  • Data-Driven Decision Making: Implementing real-time data analytics allows manufacturers to track current production status and make decisions based on the collected information. This translates into better process control, improved product quality, and reduced scrap.


  • Automotive: Producing high-volume precision parts like dashboard components, gearshift knobs, etc., for automotive manufacturers and suppliers.
  • Consumer Electronics: Manufacturing complex and accurate parts like housing components for smartphones, laptops, etc., for top-tier electronics companies.


When it comes to injection molding, getting the correct plastic pellet combinations is key. It is essential to create the best product possible in the most cost-efficient manner possible.

Each of the ten injection molding pellet combinations covered in this article provides different advantages. Whether it’s increased strength and durability or flexibility and flame resistance. 

By educating yourself on some of the most popular pellet combinations and their applications. You can better streamline your manufacturing process and create quality, reliable products that meet your unique requirements. You should contact HITOP Industrial for quality injection molding services.

FAQs Related to Plastic Pellet Combinations For Injection Molding

What plastic granules are used for injection molding?

Common plastic granules used for injection molding include polyethylene (PE), polypropylene (PP), acrylonitrile butadiene styrene (ABS), polystyrene (PS), polyvinyl chloride (PVC), and polycarbonate (PC).

What is the composition of plastic pellets?

Plastic pellets are composed of polymer resins mixed with additives such as colorants, stabilizers, fillers, and plasticizers to enhance properties like durability, flexibility, and color.

What plastic should I use for injection molding?

The choice of plastic for injection molding depends on the application requirements, such as strength, flexibility, chemical resistance, and cost. Common options include PP, ABS, and PE.

What is the best plastic for injection molding?

The best plastic for injection molding varies by application, but ABS is popular for its toughness and ease of processing, while PP is favored for its balance of flexibility and strength.

What is the difference between plastic granules and plastic pellets?

Plastic granules are small particles of raw plastic material, while plastic pellets are larger, cylindrical pieces often created from granules for easier handling and processing in injection molding.

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