Question

How much SiO2 is present in the glass which is drawn into fibers?

(a) 55%

(b) 15%

(c) 10%

(d) 4%

The question was posed to me by my college professor while I was bunking the class.

My question is based upon Fibre Reinforced Composites & Other Composites in portion Composite & Ceramic Materials of Engineering Material & Metallurgy

Answer 1

Correct answer is (a) 55%

To elaborate: Glass which is rolled into thin fibers is known as E-glass. This glass contains 55% of SiO2 and Al2O3(15%), B2O32 (10%), and MgO (4%). It is quite the preferred type of fiber-reinforcement material.