Classifying Fiberglass and Weighing Its Tradeoffs
Fiberglass for FRP breaks down mainly by shape and length, by glass composition, and by composition, properties, and intended purpose — each classification shaping how the fiberglass performs in a finished composite.
By Shape and Length: Continuous Fibers, Staple Fibers, and Glass Wool
Staple fibers: run several centimeters to several tens of centimeters, with good strength and toughness.
Glass wool: runs several millimeters to several centimeters, with good insulation and sound absorption properties.
By Glass Composition: Non-Alkali, Medium-Alkali, and High-Alkali Fiberglass
Medium-alkali fiberglass: sodium oxide content 8%-12%, with good strength and toughness.
High-alkali fiberglass: sodium oxide content above 13%, with good heat resistance and chemical resistance.
By Composition, Properties, and Purpose: E-Grade, S-Grade, C-Grade, D-Grade, AR-Grade, and ECR-Grade
S-grade fiberglass: extremely high strength and toughness — mainly used in military defense, aerospace, and high-strength composite materials.
C-grade fiberglass: good corrosion resistance and chemical resistance — mainly used in the chemical industry, battery separators, and chemical filters.
D-grade fiberglass: good high-temperature resistance and wear resistance — mainly used in high-temperature environments and friction areas.
AR-grade fiberglass: good corrosion resistance and acid-base resistance — mainly used in the chemical industry and electrolytic cells.
ECR-grade fiberglass: good corrosion resistance and alkali resistance — mainly used in the chemical industry and electrolytic cells.
Advantages and Disadvantages of Fiberglass Types
Toughness: E-grade fiberglass ranks highest in toughness, followed by S-grade, while C-grade and D-grade fiberglass fall short on toughness.
Corrosion resistance: non-alkali fiberglass offers the best corrosion resistance, followed by medium-alkali, with high-alkali fiberglass weakest.
Heat resistance: D-grade fiberglass offers the best heat resistance, followed by S-grade, while C-grade and E-grade fiberglass fall short.
Cost: glass wool costs the least, followed by staple fibers, with continuous fibers costing the most.
Choosing the right fiberglass type should match your specific application requirements. Need high strength and toughness? Choose S-grade fiberglass. Need corrosion resistance and alkali resistance? Choose non-alkali fiberglass. Need high temperature resistance? Choose D-grade fiberglass.