Glass Fibers - ASM International

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28 / Constituent Materials Table 1 Compositions of commercial glass fibers Composition, wt% Fiber Ref SiO2 B2O3 Al2O3 CaO MgO ZnO TiO2 Zr2O3 Na2OK2OLi2OFe2O3 F2 General-purpose fibers Boron-containing E-glass 1, 2 52–56 4–6 12–15 21–23 0.4–4 . . . 0.2–0.5 . . . 0–1 Trace . . . 0.2–0.4 0.2–0.7

  Trace, 1 trace