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Pultrusion is a manufacturing process that crafts continuous lengths of reinforced polymer structural shapes with a constant cross-section. The raw materials used in this process are pivotal in determining the properties and applications of the final product. Here’s an overview of the raw materials involved in pultrusion. The synergy between these materials creates composites that are tailored for strength, durability, and performance in demanding environments. Innovations in raw materials and their combinations continue to expand the capabilities and applications of pultruded products.

Reinforcing Fibers

The backbone of pultruded composites, these fibers provide the structural strength and rigidity. Glass fibers are predominantly used due to their strength, durability, and cost-effectiveness. Carbon fibers are chosen for applications requiring superior stiffness and strength-to-weight ratio. Aramid fibers, like Kevlar, offer exceptional toughness and resistance to impact, while basalt fibers bring in excellent thermal stability. Natural fibers are also gaining traction for their environmental benefits and adequate mechanical properties.

Glass fibers

The most commonly used reinforcement due to their cost-effectiveness and good strength-to-weight ratio. They are available in various forms, such as rovings, mats, and woven fabrics.

Carbon fibers

Known for their exceptional stiffness and strength, carbon fibers are ideal for high-performance applications where weight savings are crucial, such as in aerospace and automotive industries.

Kevlar fibers
Kevlar fibers

Kevlar fiber is a tough, heat-resistant synthetic fiber known for its high strength-to-weight ratio, cut resistance, and versatility. It is widely used in impact-resistant composites, protective clothing, ropes, cables, and other fields.

Basalt fibers
Basalt fibers

Basalt fiber is made by melting basalt rock. Compared to fiberglass, basalt fiber has superior properties such as high tensile strength, flame resistance, good sound insulation, and electrical insulation, as well as excellent mechanical properties. Basalt fiber has various applications, such as reinforcement materials, composite products, thermal insulation materials, and fireproof materials.

4 Products Found.

Resin Matrix

This component binds the fibers together, transferring stress between the reinforcing fibers and protecting them from environmental and chemical damage. Polyester resins are widely used for their balance of properties and cost. Vinyl ester resins provide enhanced resistance to moisture and chemicals. Epoxy resins are selected for their superior mechanical properties and strong adhesion. Polyurethane resins offer excellent flexibility and impact resistance, and phenolic resins are known for their fire retardancy.

  • Polyester Resin

    A versatile resin that provides a good balance of mechanical properties and cost, suitable for a wide range of applications.

  • Offers better resistance to water and chemicals than polyester, making it suitable for corrosive environments.

  • Epoxy Resin

    Provides superior mechanical properties and adhesion, used in applications requiring high strength and durability.

  • Polyurethane Resin

    Known for its toughness and impact resistance, it’s often used in consumer goods and automotive parts.

  • Has inherent fire retardancy and low smoke production, ideal for public transportation and construction.

  • Thermoplastic Resins

    Used in thermoplastic pultrusion to create composites that can be remelted and reshaped, offering recyclability and repairability.

Surfacing Veils

These materials are used to create a better finish on the surface of the composite and can also provide additional environmental resistance. Polyester and glass veils are common choices that enhance the appearance and prevent the fibers from being exposed on the surface.

  • Chopped Strand Mat
    Chopped Strand Mat

    Chopped Strand Mat (CSM) is a form of reinforcement used in the composites industry, typically made from randomly distributed glass fibers that are held together by a binder. It’s favored for its ease of use and versatility, conforming well to complex shapes. CSM is commonly used in hand lay-up, resin infusion, and in the pultrusion process to create parts that require multi-directional strength and a uniform surface finish.

  • Continuous Filament Mat
    Continuous Filament Mat

    Continuous Filament Mat (CFM) is a reinforcement material composed of continuous strands of glass fibers laid in a random pattern and bonded together with a resin binder. This mat is particularly valued for its uniform strength and consistency, making it suitable for use in pultrusion, filament winding, and other automated processes where consistent properties are critical. CFM provides excellent structural integrity and is often used in the production of high-strength, lightweight composite structures.

  • Fiberglass Surface Tissue

    Fiberglass Surface Tissue is a thin layer of finely dispersed glass fibers, bound by a resin-compatible binder, designed to provide a smooth, resin-rich surface to composite products. It enhances the surface appearance and prevents the print-through of underlying fibers, offering improved corrosion resistance and an excellent substrate for coatings and paints. This tissue is widely used in the pultrusion process, as well as in hand lay-up and spray-up molding, to create a high-quality finish on composite parts.

Fillers and Additives


Provide color to the composite, enhancing aesthetic appeal.

Flame Retardants
Flame Retardants

Improve fire resistance, crucial for safety in many applications.

Calcium Carbonate
Calcium Carbonate

A common filler that improves dimensional stability and surface finish.

Core Materials
Core Materials

Used in sandwich constructions to create lightweight structures with high stiffness.

UV Inhibitors
UV Inhibitors

Protect the composite from degradation due to ultraviolet radiation.

Release Agents
Release Agents

Aid in the release of the finished product from the mold, ensuring a smooth surface.

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