What are the two important properties of SiO2?

What are the two important properties of SiO2?
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1 Answer

Answer :

1.SiO2 is an extremely hard protective coatng & is unaffected by almost all reagents except by hydrochloric acid. Thus it stands against any contamination. 

2.By selective etching of SiO2 , diffusion of impurities through carefully defined windows in the SiO2 can be accomplished to fabricate various components.
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