Frequently Asked Question About Pultrusion

IncomePultrusion supplies pultruded FRP profiles including fiberglass flat bars, square rods, round rods, angles, H-beams, rectangular tubes, square tubes, round tubes, channels, T-profiles, and sheet piling. Custom cross-sections are available on request.

IncomePultrusion is a manufacturer. We operate our own FRP pultrusion production lines in Nanjing, China, producing pultruded profiles, FRP rebar, fasteners, and pultrusion machinery in-house. Buyers deal directly with the factory, with direct factory pricing and no trading-company intermediary.

IncomePultrusion is located at No. 212, LanTian Road, Lukou Economical Park, JiangNing District, Nanjing, Jiangsu, China. Nanjing is a major industrial city in eastern China with direct access to Shanghai’s export ports, which keeps international freight arrangements straightforward.

Yes. IncomePultrusion manufactures and supplies pultrusion machines, FRP caterpillar pultrusion machinery, pultrusion dies and molds, resin mixers, pull-winding equipment, roll mat slitters, and polyurethane pultrusion injection machines.

FRP pultruded profiles from IncomePultrusion are used in construction, chemical processing, power utilities, solar energy structures, marine and offshore projects, wastewater treatment, mining, and civil infrastructure.

Yes. We produce OEM and custom pultruded profiles to customer drawings, including non-standard cross-sections, specific resin systems, colors, and surface finishes. For new shapes we design and manufacture the pultrusion die in-house, which shortens tooling lead time and keeps tolerances under our direct control.

The fastest way to start is to request a quote through our contact form, or email us at frp@incomepultrusion.com with your drawing or specification. We reply with pricing, MOQ, and lead time, and production begins once the order details and payment terms are confirmed.

Send the profile cross-section drawing (DWG, PDF, or STEP format), the resin system or performance requirements, the dimensions and quantities you need, and the destination port. The more complete the drawing and specification, the faster we can confirm tooling feasibility and return an accurate price.

Minimum order quantities vary by product type, dimensions, material, and tooling requirements. Contact IncomePultrusion with your drawing or specification for a specific MOQ and lead time quote.

Yes, samples of standard profiles can usually be arranged before you place a bulk order. Sample availability and cost depend on the profile and whether existing tooling covers it, so tell us the specification you need and we will confirm what we can send.

Lead time depends on the product, order quantity, and whether new tooling is required. Standard profiles from existing dies ship faster than custom sections that need a new die. Send us your drawing and quantity and we will confirm a specific production and delivery schedule with your quote.

Yes, we export FRP profiles, rebar, and machinery to buyers worldwide by sea, air, or express courier. Profiles are packed in bundles or pallets suitable for container loading, with protection against moisture and handling damage. Packing methods and Incoterms are detailed in our shipping policy.

Pultrusion is a continuous manufacturing process for fiber-reinforced composite materials. Continuous strands of fiberglass or similar fibers are pulled through a resin bath and into a heated die, where the profile is shaped and cured. The result is a constant cross-section composite part with high strength and excellent durability, used in construction, transportation, and industrial applications.

Pultrusion can produce composite materials with exceptional strength-to-weight ratios. Industries ranging from construction to aerospace use these products. They offer superior mechanical properties compared to traditional materials and are corrosion-resistant.

A typical example is the manufacturing of fiberglass reinforced plastic (FRP) profiles. Continuous fibers are pulled through a resin bath, then through a heated die that shapes and cures the composite into its final cross-section.

Both processes produce parts with a constant cross-section. Extrusion pushes thermoplastic material through a die, while pultrusion pulls continuous fibers, such as fiberglass or carbon fiber, through resin and a heated curing die.

Pultrusion offers a high strength-to-weight ratio, corrosion resistance, consistent quality over long production runs, the ability to form custom cross-sections, low maintenance in service, and cost-effective production at volume.

Pultrusion makes straight, constant cross-section profiles. Filament winding wraps resin-impregnated fibers around a rotating mandrel to create hollow, complex shapes such as pipes and pressure vessels.

Pultrusion has many advantages but also limits. The cross-section must be constant along the length, complex curved shapes are not practical, it uses thermosetting resins, and part size is constrained by the die and pulling equipment.

No, pultrusion is a closed mold process. The fibers and resin are shaped and cured inside a heated steel die rather than in an open mold.

The main components are the fiber creel and reinforcement guides, the resin bath or injection system, the heated forming and curing die, the pulling system, and the cut-off saw. Die design and temperature control are critical to part quality.

The aerospace industry uses pultruded composites in stiff, lightweight structural elements such as wing and fuselage components, where the high stiffness-to-weight ratio of pultruded sections is a key advantage.

A pultrusion machine is specialized equipment used to manufacture fiber-reinforced polymer (FRP) composites. It pulls continuous fibers through resin impregnation and a heated die, then cuts the cured profile to length.

Yes, pultrusion is one of the most widely used techniques in composite manufacturing, especially for producing structural profiles in high volumes with consistent quality.

Manufacturers use pultruded carbon fiber in aerospace engineering, automotive manufacturing, and sporting goods, wherever high stiffness and low weight are required.

Pultrusion is a continuous, automated process, which gives it high output and very consistent part quality compared with batch processes such as hand lay-up or RTM. It is the standard method for producing constant cross-section composite profiles.

Pultruded thermoplastics are used in the construction industry, the transportation sector, and consumer goods, where their toughness and recyclability complement traditional thermoset pultrusions.

IncomePultrusion offers polyester, vinyl ester, epoxy, and polyurethane resin systems. Vinyl ester is commonly used for corrosive chemical environments, while polyurethane can be used for high-impact structural applications.

No, fiberglass rebar cannot be bent in the field once it has cured. Unlike steel, GFRP rebar is a thermoset composite that stays straight after manufacturing and will break rather than yield if you try to bend it on site. Any bends, hooks, or stirrups must be factory-made during production, so bent shapes should be specified with your order.

Yes, fiberglass rebar can be cut on site with common tools. A diamond-blade saw, abrasive cut-off wheel, or angle grinder all work well, and the bar is much lighter to handle than steel. Wear a dust mask and eye protection, and seal cut ends if the specification requires it — see our guide on how to cut fiberglass rebar correctly.

Yes, fiberglass rebar can be painted, although it is rarely necessary because the bar is corrosion-free and usually embedded in concrete. Where a surface color or marking is needed, light surface preparation and a compatible coating system give the best adhesion. Details are in our guide on how to paint fiberglass rebar.

No, fiberglass rebar does not rust. It is made of glass fibers in a polymer resin, so there is no iron to oxidize and no electrochemical corrosion mechanism like the one that destroys steel reinforcement in chloride or marine environments. This corrosion-free behavior is the main reason engineers specify FRP rebar for coastal structures, wastewater plants, and de-icing salt exposure.

Fiberglass rebar has higher tensile strength than steel rebar but lower stiffness. Typical GFRP bars reach tensile strengths of 750 MPa or more, roughly twice that of steel, while their elastic modulus is about 40–60 GPa, roughly a quarter of steel’s ~200 GPa. Designs must therefore account for deflection and crack control differently, as covered in our FRP vs steel comparison.

Yes, FRP panels can be painted if the surface is properly prepared. Cleaning, light sanding, and a suitable primer are needed because the glossy resin surface resists adhesion, and a compatible topcoat such as acrylic or polyurethane gives a durable finish. The full procedure is in our guide to painting FRP panels.

Yes, but only exterior-grade FRP panels should be used outdoors. Standard interior panels are not UV-stabilized and can chalk, fade, or fiber-bloom under sunlight, while exterior grades use UV-resistant resins, veils, or gel coats for long-term weather exposure. Available options are covered under FRP panel colors and finishes.

No, fiberglass and FRP composites are electrically non-conductive. The glass fibers and polymer resin are both insulators, so FRP profiles do not carry current and are safe to use around live electrical equipment. This is a key advantage over steel and aluminum in utility, rail, and electrical applications — see G10/FR4 electrical properties for typical insulation performance.

It depends on how you measure strength. Pound for pound, FRP composites offer a higher strength-to-weight ratio than steel and comparable or better tensile strength in the fiber direction, but steel is stiffer and stronger in absolute terms for the same cross-section. The trade-offs are explained in our fiberglass vs steel strength comparison.

FRP profiles are cut with diamond-blade saws, abrasive cut-off wheels, or carbide-tipped blades, using steady feed and dust extraction. Cut edges should be sealed in corrosive or outdoor service to prevent wicking into the laminate. Tool selection and safety steps are covered in our guide on how to cut FRP fiberglass profiles.

Standard polyester FRP profiles will burn, so they are not fire resistant by default. Fire-retardant resin formulations are available that achieve ASTM E84 Class A or Class C ratings, where Class A means a flame spread index of 0–25 and Class C a flame spread index up to 200 with a smoke developed index up to 450. Specify the required rating when you order pultruded profiles so the correct resin system is used.