section_path: Types/Silicate glasses/Soda–lime glass
section_name: Soda–lime glass
paragraph_text: Soda–lime glass
  
  Sodium carbonate (Na CO, "soda") is a common additive and acts to lower the glass-transition temperature. However, sodium silicate is water-soluble, so lime (CaO, calcium oxide, generally obtained from limestone), along with magnesium oxide (MgO), and aluminium oxide (Al O), are commonly added to improve chemical durability. Soda–lime glasses (Na O) + lime (CaO) + magnesia (MgO) + alumina (Al O) account for over 75% of manufactured glass, containing about 70 to 74% silica by weight. Soda–lime–silicate glass is transparent, easily formed, and most suitable for window glass and tableware. However, it has a high thermal expansion and poor resistance to heat. Soda–lime glass is typically used for windows, bottles, light bulbs, and jars.