Continuous fiber reinforcement in roving or mat/ roving forms are drawn through a resin bath to coat each fiber with a specially formulated resin mixture. The coated fibers are then drawn through a heated die.

Cure of thermosetting resin is initiated by heat in the die and catalyst in the resin mix. The rate of reaction is controlled by heating and cooling zones in the die.

The resulting high strength profile is cut to length, ready to use as it leaves the pultrusion machine.


Properties of pultruded structural shapes

	Lightweight - less density - 20% of steel; 70% of aluminum
	High Strength - stronger than structural steel pound for pound
	Superior dimensional stability - wide temperature range uses and thermal expansion values better than 50% of mild steel, 35% of stainless steel and 25% of aluminum
	Electrical insulation - better design advantages through excellent dielectric properties
	Thermal insulation - high strength and insulating values
	Corrosion resistance - harsh elements and environments
	Electromagnetic transparency - greater frequency freedom of movement for radiowaves and microwaves
	Consistent cross section
	Inherent color
	Part consolidation
	Ease of fabrication & installation

Resin systems available include standard polyester as well as vinylester, epoxy, and phenolic.