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Since 1956, Strongwell has been manufacturing high quality fiber reinforced polymer (FRP) products using "the continuous automatic process" (today known as "pultrusion").

Strongwell is recognized as the world's leading and largest pultruder of FRP.

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The Pultrusion Process

Strongwell’s core competency is pultrusion! Pultrusion is a manufacturing process for producing continuous lengths of reinforced polymer structural shapes with constant cross-sections. Raw materials are a liquid resin mixture (containing resin, fillers and specialized additives) and flexible textile reinforcing fibers. The process involves pulling these raw materials (rather than pushing, as is the case in extrusion) through a heated steel forming die using a continuous pulling device.

The reinforcement materials are in continuous forms such as rolls of fiberglass mat and doffs of fiberglass roving. As the reinforcements are saturated with the resin mixture (“wet-out”) in the resin bath and pulled through the die, the gelation, or hardening, of the resin is initiated by the heat from the die and a rigid, cured profile is formed that corresponds to the shape of the die.

While pultrusion machine design varies with part geometry, the basic pultrusion process concept is described in the schematic shown below.

The Harrington Difference
Providing over 60 years of exceptional service

Harrington is a leading Strongwell distributor. Call our toll-free number at 1-800-213-4528 and you will be connected to a live person – not a recording. You can also use the contact form below for any questions regarding our full line of Strongwell products.

Harrington Industrial Plastics - Strongwell

Why Choose Fiberglass

What is Fiberglass Reinforced Polymer?

Fiberglass Reinforced Polymer (FRP) is most often referred to simply as “fiberglass”. Used in this context, “fiberglass” is a composite consisting of a polymer resin matrix reinforced by embedded glass fibers. The strength of a fiberglass part is determined primarily by the type, orientation, quantity, and location of the glass fibers within the composite.

Product Range

Strongwell has by far the world’s largest array of proprietary fiber reinforced polymer (FRP) pultruded structural products including standard structural shapes, plate, grating, planking, handrail systems, building panels, ballistic resistant plate and systems, power poles, nuts and bolts, cooling tower components, ladder rail, and tool handles. The company also has hundreds of active customer-owned sets of dies and tooling for custom parts, some of which are available for use with a small royalty to the die owner. The extensive product range means more products to sell, and more products to choose to optimize solutions.

The Features of Strongwell’s Fiberglass Composites

High Strength

Stronger than structural steel on a pound-for-pound basis. Used for building structures, walkways, platforms, etc.

Light Weight

Strongwell’s fiberglass composite products weigh approximately 75-80% less than steel and 30% less than aluminum. This translates to lower transportation costs, easier installation and less weight in structural designs.

Corrosion Resistance

Strongwell’s proprietary “wet-out” process ensures complete reinforcement saturation. Fiberglass will not rot and is impervious to insects and a broad range of corrosive environments. Strongwell FRP composites have been successfully used for indoor and outdoor applications at hotels, restaurants, chemical plants, water and wastewater treatment plants, and in many other corrosive environments.

Low Conductivity

An excellent insulator, fiberglass has low thermal and electrical conductivity, making it a popular choice in electrical applications.

Electromagnetic Transparency

Fiberglass is transparent to radio waves, microwaves, and other electromagnetic frequencies. Strongwell composite products are
regularly used in cellular applications due to this feature.

Buy your next Strongwell products from Harrington and experience the difference.

Can’t find what you’re looking for?

Call our toll-free number at 1-800-213-4528 and you will be connected to a live person – not a recording. You can also use the contact form above for any questions regarding Strongwell products.