Glass Fibre Types and Compositions

Major types: E-glass (electrical, 54% SiO₂, 14% Al₂O₃, 17% CaO, 10% B₂O₃—90% of production, general purpose), S-glass/R-glass (high strength, 65% SiO₂, 25% Al₂O₃, 10% MgO—25% higher strength for aerospace), C-glass (chemical resistant, high boron content for corrosive environments), AR-glass (alkali resistant with 16-20% ZrO₂ for concrete reinforcement), D-glass (dielectric, low dielectric constant for electronics), and ECR-glass (acid resistant, boron-free for environmental compliance).