What is pultrusion?

Pultrusion is a manufacturing technology for producing continuous lengths of fiber-reinforced polymer composites of consistent quality at an excellent price point

A composite is created by the process of combining two or more materials to make them stronger than if they were used by themselves. Manufacturing composites using the pultrusion process creates a constant cross section of fibres providing increased strength. The flexible process allows for a range of chemical and technological variations.

GFRP (glass-fibre reinforced polymer) composites are a versatile material that can be shaped, drilled, pigmented and finished to varying degrees. More than 70% of our products are supplied into customer applications as critical components.

The pultrusion process

Pultrusion is an automated process for the continuous production of fiber-reinforced profiles with a constant cross section. The manufacturing process begins with the fibers (glass, aramid, carbon or basalt) being pulled into an impregnation bath.

Once the raw fiber has been impregnated with a liquid resin (polyester, vinylester, polyurethane, epoxy, hybrid resins) it is pulled further into a forming and curing die (mold) where it is heated and given its final shape. The material, now reinforced and cured, is continuously and automatically pulled through a flying cut-off saw which cuts the profiles to the desired length.

 

Pultrusions are a smart structural material

GFRP pultrusions have a tensile strength greater than structural steel on a kg-for-kg basis. Combined with load specific properties, it is a technically preferred material for use in construction and critical components. 

It is 1/4 the density of steel and it has 30% less density than aluminum. GFRP composites are versatile and offer many advantages.