Fiberglass Raw Materials

Select based on form (chopped strand, mat, woven roving, cloth, or resin-infused preforms), required mechanical properties (tensile strength, stiffness), compatibility with your resin system (polyester, epoxy, vinyl ester), and the part’s thickness and layup method; consult material datasheets for fiber weight (gsm or oz/yd²) and orientation to match strength needs

Cost depends on fiber form and weight, glass type (E-glass vs. specialty glass), roll or package size, required surface finish or sizing for resin compatibility, and brand; typical market options span from lower-cost chopped strands and mats to higher-cost woven reinforcements and preforms

Match the fiberglass sizing to the resin family—sizing is applied to fibers to improve wet-out and adhesion; check supplier datasheets or product labels for specified resin compatibility (polyester, epoxy, vinyl ester), and run a small test layup if uncertain

Wear long sleeves, chemical-resistant gloves, safety goggles, and a respirator rated for particulates and solvents; use ventilation or local exhaust, avoid skin contact with dry fibers and uncured resins, and clean work surfaces and clothes promptly to reduce irritation and contamination

Store rolls and mats flat or upright off the floor in a dry, temperature-controlled area away from direct sunlight and moisture; keep original packaging sealed to protect against dust and humidity, and rotate inventory to use older stock first

Chopped strand mat provides isotropic strength, good for molding complex shapes and rapid wet-out, but lower tensile strength per layer; woven roving and cloth offer higher directional strength and better load transfer along fiber directions, making them preferable for structural laminates

Required laminate thickness varies widely by application and load; engineers design laminates using fiber type, orientation, and resin to achieve target laminate properties—common small structural parts often use multiple layers totaling 1–6 mm, but calculate with mechanical requirements or consult an engineer for safety margins