Glass

Glass

8.2

Glass

Main component: silica or silicon dioxide
Main characteristics;
- Brittle
- Chemically inert
- Hard
- Transparent
- Heat insulator
- Does not conduct electricity
- Not permeable to gas and liquid

Types of glass and properties

Types of glass	Composition
Fused silica glass	Silica
Soda-lime glass	Silica Sodium carbonate Calcium carbonate
Borosilicate glass	Silica Sodium carbonate Calcium carbonate Boron oxide Aluminium oxide
Lead glass	Silica Sodium carbonate Lead(II) oxide

Types of glass	Properties
Fused silica glass	High melting point Does not expand or contract easily
Soda-lime glass	Low melting point Easily shaped Cannot withstand high temperature
Borosilicate glass	High melting point Expands and contracts very little when there is temperature change Can withstand high temperature and chemical reactions
Lead glass	High refractive index High density Shiny

Types of glass	Example
Fused silica glass	Lens of telescope
Soda-lime glass	Glass container
Borosilicate glass	Laboratory glassware
Lead glass	Prism