Thermoplastics vs. Fiberglass: A Comparison for OEMs

Both fiberglass and thermoplastics are popular material choices for OEMs across a range of industries. Each offers distinct advantages, but they perform differently depending on your specific application. In this blog, we’ll compare thermoplastics vs. fiberglass, breaking down the pros and cons of each to help you determine which material is best suited for your part production needs. Understanding the differences will help guide a more confident material selection.

What Are Thermoplastics?

Thermoplastics are a group of plastics that can be heated and melted to produce parts. Thermoplastics can be pure polymers or composite materials of any of the following plastic types:

• ABS & FR ABS
• Acrylic
• Co-Extruded Materials
• HDPE
• PETG
• Polycarbonate
• Polypropylene
• Polystyrene
• TPO

Each type of thermoplastic has unique properties, so the best option depends on the final part and product. For example - a thermoplastic like TPO has excellent chemical resistance and a low temp impact but is difficul to bond and paint - making it a fantastic choice for skirting and bumper applicants. ABS on the other hand is less chemical resistant, but impact-resistant and easy to bond, print and paint - making it an ideal choice for shells, covers and roofs. The right thermoplastic is highly dependent on the specifi application. 

Related Content: Comparing Thermoplastics – ABS vs HDPE vs TPO

Benefits of Thermoplastics

Thermoplastics and thermoforming offer a host of benefits, including:

• High recyclability
• Easy processing and efficiency
• High impact resistance and durability
• Vast customization options and versatility
• Lightweight body
• Uniform wall thickness
• Cost effective 

For parts that need to be be durable yet lighter weight and need a faster turnaround time, thermoplastics are a fantastic choice. They can be fabricated using just one mold in 15 minutes or under.

Related Blog: Thermoforming Design Basics

What is Fiberglass?

Fiberglass is a composite made of glass fibers and a resin polymer. This material is incredibly strong and offers natural UV resistance, but it’s significantly more flexible than other metal and non-metal fibers.

As a composite material, fiberglass comes in several different varieties with unique properties. The most common for OEMs are E-glass (designed for insulating electrical components), E-CR-glass (for elecrical/chemical/acid resistant applications), and R-glass (typically used for reinforcement). 

Benefits of Fiberglass

Fiberglass also offers some unique advantages, including:

• Lightweight material compared to steel and aluminum
• Flexible design and customization options
• High UV and corrosion resistance
• Long-lasting, weather-resistant material
• Low maintenance upkeep
• Strength and rigidity 

However, fiberglass is significantly heavier than thermoplastics and has much higher material and tooling costs.

Comparing Thermoplastics vs. Fiberglass

When comparing thermoplastics and fiberglass, here are the crucial differences:

Are Thermoplastics or Fiberglass Better for Your Project?

Ultimately, deciding whether thermoplastics or fiberglass is better for your project isn’t a one-size-fits-all answer. Some projects may require the high strength-to-weight ratio of fiberglass. Other projects may work just as well with an impact-resistant thermoplastic that’s more cost-effective. Using the comparison chart above can help you determine the best material selection for your project. If you need help narrowing down your options, contact our part fabrication experts at ICP for more information.

Industrial Custom Products: Advanced Thermoplastic Solutions

Choosing between thermoplastic and fiberglass for your parts is dependent on your project goals and specific needs.  If you need help selecting the best material for your project, reach out to our team at Industrial Custom Products (ICP). With years of experience in the thermoforming and die-cut part industry, we can help you narrow down your options and find the best solution for your project. Ready to get started?

Industrial Custom Products is a one-stop-shop for custom manufacturing and plastic fabrication, including: prototyping and product development, die cutting and dieless knife cutting, thermoforming and vacuum forming, large part thermoforming, CNC plastic routing, fabrication and assembly and drape forming.