Types of Resin | Resins used in Injection Molding | Ferriot Inc

Posted by Brad Martin on Nov 20, 2014 9:49:53 AM

Plastic PelletsWhen beginning the process of developing a plastic component through the injection molding process, one of the top priorities needs to be identifying the type or types of resin to be used on the product. While there is opportunity to customize the resins to fit the end use of the part, there are a wide variety of resins available, which opens up unlimited possibilities in design and function.   

The first step in the process is to identify the key physical attributes that the end product requires. Below is a list of properties the need to be evaluated:

  1. Chemical and environmental resistance
  2. Flexible Strength
  3. Temperature operating range
  4. Fatigue resistance
  5. Electrical properties
  6. Impact Strength
  7. Flammability 

Next, you will need to choose from a wide variety types of resins. With these resin classes you have a variety of products that gives you flexibility to customize your needs. It also allows you to match the resin to the part design and mold ability of the part. 

Engineering Grade Resins

  1. Nylon: Tough, good thermal and chemical resistance, with a wide variety of grades available with broad scope of physical properties. 
  2. Polycarbonate: Strong, high flex modulus, good temperature range, transparent. 
  3. ABS: Good impact, superior surface quality, good color-ability, good rigidity, with electroplatable grades available. 
  4. PC/ABS: Good processability, good toughness at low temperature, good dimensional stability. 
  5. TPE: “Soft” touch materials, rubber replacement materials, good tear strength, and good flexibility.
  6. Acrylic: High optical clarity, good lens materials
  7. Acetal: Excellent wear resistance, excellent material for gears and high wear applications.
  8. Structural Foam: Excellent material to be used in where metal replacement is applicable. Good weight-to-stiffness ratio.  

Commodities Grades

  1. Polypropylene: Versatile material, variety of grades in homopolymer and copolymer classes, good chemical resistance, good fatigue resistance, excellent chemical resistance, lower cost.
  2. Polyethylene: Very versatile, low-cost material, variety of grades in LLDPE, LDPE, and HDPE, tough, weatherable, and easily processed. 
  3. Polystyrene: Available in general purpose PS and HIP polystyrene, lower cost, range of impact from low to high, good clarity in GPPS grades, good rigidity.  

In summary, when choosing a plastics resin to use in any type of injection molding applications, the possibilities are limitless. The list above just touches the edges of options for resin selection. By working with a Ferriot, Inc. representative, we will help you identify the correct and optimum resin to use in your applications. We benefit from having long-term partnerships with leaders in resins manufacturing. This allows us to optimize the success of your projects.

Click here to download our worksheet: Which Injection Molding Technology is Right for You?

For another blog post by Brad, check out:
How Ferriot is Different from Other Plastics Manufacturers

Image credit: Just start with plastic pellets by PICNIC Network via Creative Commons License Attribution-ShareAlike 2.0

Topics: Injection Molding

Brad Martin is a Senior Account Manager with Ferriot and has been working in the plastics industry for nearly 30 years. He is based out of Chicago, IL.
Connect with me on:

What we do

Specialized engineering assistance, complex thermoplastic material development, injection molding, finishing, contract manufacturing, and commitment to total quality management.

ferriot associations