Layers of pre-preg convolute wound into tubes.

What are convolute wound tube materials?

Convolute winding is a process by which pre-preg material are wound onto a mandrel and then cured. Unlike filament winding processes, convolute wound tubes have the metering of the resin content controlled during the pre-preg manufacturing process. Furthermore, they can use various fiber architectures such a woven or stitched fabrics to engineer repeatable fiber orientation in the tube. Tubes can be produced with different materials in the ID, core, or OD to enhance specific performance characteristics.

Tube materials are fully cured and ready for fabrication by standard stock removal processes such as turning, milling, drilling, and other specialized processes depending on the part geometry, complexity, and tolerance requirements.

Some tubes are produced to comply with various electrical industry standards.

Tubes are limited to a maximum of 48 inches (1.2 meters) in length. Internal diameters range from 0.093 inches (2.3 mm) to over 48 inches (1.2 meters) on specially built mandrels. The possible ID wall, OD wall, or ID/OD combinations varies by material type.

tubes for electrical applications
industry standard tubes
tubes for structural applications

Why Norplex-Micarta tube materials?

Norplex-Micarta has been producing thermoset tubes for various demanding applications for more than 50 years. Resin systems based on epoxy, melamine, and silicone are commonly ran in our Postville, Iowa facility. These and other resin chemistries are often modified with additives to provide even more functionality for designers and engineers looking for a material solution to demanding applications. Reinforcements are even more varied. Glass, carbon, natural and synthetic reinforcements are all possible.

Production of tubes is co-located with production of pre-preg. All of these processes are conducted under a quality management system that is ISO 9001 certified, on equipment that is routinely updated with the latest in control technology.

With more than 50 standard grades of tubes, and nearly infinite amount of customization the options, composite tube materials can seem overwhelming. Norplex-Micarta has dedicated application and material development engineers to support material selection, application development, prototyping, and customization to support designers and engineers. 

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pre-preg products
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stock shape products

Norplex-Micarta also offers pre-preg, sheets, and other stock shapes.

Would one of these material options be more suitable for your project? Perhaps one of these forms would allow for a prototype to be produced economically and with a quicker turnaround compared to other options?