Canadian Plastics

High-Strength Fasteners Molded by Unique Process

Fasteners that are subjected to high mechanical load are traditionally machined from blanks because conventional thermoplastics processing techniques do not permit the necessary high fibre content. In...

July 1, 2003   Canadian Plastics



Fasteners that are subjected to high mechanical load are traditionally machined from blanks because conventional thermoplastics processing techniques do not permit the necessary high fibre content. In contrast, Icotec AG is producing fasteners by composite flow molding, using Victrex PEEK engineering resin. This innovative process allows components to be produced in high volumes in a single step without the need for post-treatment.

Victrex’s PEEK resin is a polyaryletherketone. With Icotec’s use of endless carbon fibres in the PEEK polymer matrix, ultra-high specific strength of up to 600 Mpa/g/cm3 (2.4 million psi/lb/in3) is possible, exceeding that of aluminum and titanium.

Chris Karas, general manager for Victrex North America, explains: “The composite flow molding process begins by aligning and feeding pultruded PEEK polymer composite rods into a closed pre-heating cavity. From there, they are axially transferred to the mold and formed under pressure. The technique produces helically reinforced threads which are well protected against abrasion when the fastener taps the bore.”

The semi-crystalline PEEK polymer matrix has a melting point of 343 C (649 F), and can be reinforced with carbon, glass, ceramic or even metal-based fibres.

Victrex North America 800-VICTREX


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