Custom Pultrusions and Pultruded Fiberglass

Pultrusion Composites

Röchling Glastic Composites pultrudes a wide variety of fiberglass reinforced plastic tubes, profiles and solid rods. Custom parts range from rugged outdoor construction materials to high-strength thin-wall parts for the transportation industry.

Pultrusion Benefits

Through the proper selection of resin and reinforcement, pultrusion offers the designer a unique blend of performance properties.

  • High Strength-to-Weight Ratio
  • Corrosion Resistance
  • Dielectric Properties
  • Weatherability
  • Ease of Fabrication
  • Dimensional Stability
  • Heat Resistance
  • Custom and Unlimited Lengths


Pultrusion is a term applied to both a manufacturing process and to the molded parts produced by it. Pultrusion is a very cost-competitive method of producing continuous length profiles of fiber-reinforced polymer composites.

The pultrusion process allows the incorporation of many different materials to achieve specific results. Fibers include aramid and carbon with the most common being fiberglass. The most frequently used polymers are in the polyester and vinylester families. Epoxies, phenolics, and even thermoplastics are also pultrudable. Proper part design and material selection result in very high-performance, cost-effective parts.

Röchling Glastic was one of the first companies to adopt this unique process and now has over 40 years of expertise. We have an extensive line of pultruded structural composite shapes including rods, bars, tubes, angles and channels. These products are readily available through a worldwide network of distributors and fabricators. We are also custom pultruders. We can take your ideas and turn them into reality

The Pultrusion Design Process

The process begins in our Development Group. Through the use of Micro Mechanics and Laminate Theory our engineers first develop the material construction and properties of the composite.

Then, using CAD packages coupled with Finite Element Analysis, the composite and its properties are analyzed for its performance in your application. Throughout, we work with you to optimize the shape of your part and materials included in it.

Process Engineering then designs the fixtures and resin impregnation systems which insure that the part is consistently manufactured with the specified performance characteristics.

Working together, the two groups design the molds for optimum resin curing and process economies.


Almost any constant cross-section can be pultruded. Solid parts, hollow parts, and complex geometries are all possible. Length is only restricted by the practicalities of material handling and transportation. Röchling Glastic pultrudes rods as small as 0.020 inches in diameter with a length of over 50 kilometers. Our equipment will accommodate parts up to 48 inches in width.

Mechanical Properties. The strength of a pultruded fiberglass comes mainly from the type, form and quantity of fibers used. Parts made with straight rovings alone produce excellent longitudinal strength but have little cross-wise strength. The addition of random fiber mats create more uniform strength properties throughout the part. Many other forms of reinforcement are available today which allow the designer to achieve very specific results. These include woven fabrics, braids, scrim mats, and stitched materials. Different types of fibers — glass, carbon, aramid, and others — can be incorporated in the same part. Careful design and placement of fibers result in high performance parts at very competitive costs.

Environmental Performance. One of the outstanding advantages of Röchling Glastic pultruded fiberglass reinforced plastic parts is their ability to perform over long periods of time in a variety of environmental conditions. The civil engineering community is now looking at pultruded composites as a replacement for steel in many bridge and highway applications. Higher in initial costs, pultrusions have a lower overall lifetime cost. Dry type electrical transformers have long used pultruded dielectric spacers which perform continuously at temperatures as high as 200°C. Röchling Glastic pultrusions will not rot or melt. They can be designed for flame resistance and weather resistance. As in mechanical properties, the achievement of these results is a matter of proper material selection and design.

Ease of Fabrication. Pultruded composite structural shapes are often components of a larger design. This is easy to do since the composite materials are readily machined, bonded, or mechanically fastened. Common carbide tools are quite adequate. High volume fabricators usually find diamond-coated tools to be most cost effective.

We welcome the opportunity to tell you more about our unique composite pultrusion capability and how it can help improve your products and reduce your costs. Please contact us to schedule a technical meeting to discuss your requirements. By sending us a drawing or part ahead of time, we can incorporate our evaluation into the meeting.


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