The melting point of glass varies greatly according to what type of glass is being melted, but typically ranges from 2,597 to 2,912 degrees Fahrenheit. The variance in melting temperatures is caused by the mix of materials used initially to create the glass.
Silica glass, made from sand, has the highest melting point, but it is also the strongest glass. To reduce the melting point, commercial glass makers add sodium carbonate or soda and lime. Other ingredients that may be used include magnesia and alumina, as well as other ingredients that alter the quality, texture and color of the glass.