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Table 3 Chemical composition of E glass fiber

From: R&D on glass fiber reinforced epoxy resin composites for superconducting Tokamak

E type glass fiber SiO2 Al2O3 CaO Mg0 B2O3 K2O + Na2O
Content (%) 52–55 13–25 15–17 3–5 7–9 <0.8