Nine Key Properties of Pultruded Fiber Reinforced Polymer

Fiber Reinforced Polymer (FRP) is a composite material composed of a polymer matrix reinforced with fibers, usually glass or carbon. When manufactured using the pultrusion process, FRP offers some key properties that make it advantageous for various applications. Here are nine key properties of pultruded fiber reinforced polymers:

Mechanical Tests Collage

High Strength

Pultruded FRP has an excellent strength-to-weight ratio. It is extremely strong, yet lighter than traditional materials like steel or aluminum. The continuous fiber reinforcement provides high tensile and flexural strength, making FRP ideal as a structural material in numerous applications.


The lightweight nature of FRP is a significant advantage in many industries. It helps reduce the overall weight of structures, vehicles, or components, leading to improved fuel efficiency, higher payload capacities, and easier handling during installation or transportation.

Corrosion Resistance

One of the major benefits of FRP is their inherent resistance to corrosion. Unlike metals, which can corrode when exposed to moisture, chemicals, or harsh environments, FRP cannot rust, and withstands significant chemical exposure without sacrificing performance (see Strongwell’s Corrosion Resistance Guide for more details). FRP’s corrosion resistance make it suitable for applications in marine environments, chemical plants, or structures exposed to a wide range of corrosive elements.

Fatigue Resistance

FRP exhibits excellent fatigue resistance, meaning it can withstand repeated cyclic loading without experiencing significant degradation in performance. This property is crucial in applications subjected to dynamic or cyclic loading, such as bridges, wind turbine blades, or aerospace components.

Design Flexibility

FRP offers design flexibility due to its excellent molding and shaping capabilities during the manufacturing process. The fibers can be oriented in different directions to tailor the mechanical properties of the material according to specific requirements. This versatility enables the production of complex shapes and highly customizable components.

Electrical Insulation

FRP is extremely low in electrical conductivity, making it an ideal choice for applications where electrical insulation is necessary. FRP is often used in electrical enclosures, circuit board components, or as structural members in environments where electrical conductivity could pose a risk.

Electrical Testing Room Pano

Thermal Insulation

FRP has low thermal conductivity, which makes it suitable for applications requiring thermal insulation. Reducing heat transfer and improving energy efficiency in various industries, including construction, transportation, and aerospace, is a major benefit – one where pultruded FRP structural parts are significantly better than traditional methods to minimize thermal transfer.


Unlike metals, FRP is non-magnetic, which is advantageous in applications where magnetic interference must be minimized, such as in medical equipment or electronics.

Environmental Resistance

FRP exhibits excellent resistance to environmental factors such as UV radiation, moisture, and temperature variations. When properly manufactured for the environment, FRP doesn’t degrade easily when exposed to sunlight, humidity, or extreme temperatures, making it a durable and long-lasting option.

With these key properties in mind, Strongwell develops pultruded fiberglass products for a wide range of applications, including automotive, construction, marine, architectural, and many other industries.
Please don’t hesitate to contact Strongwell to learn more about how each of these key properties can be tailored to meet the needs of your project.