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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