Float glass is made with a mixture of silica sand, soda ash, dolomite and various other carefully mixed and weighed ingredients.  The mixed batch is sent to a furnace for melting into a glass liquid at high (over 1500 C) temperature.  After leaving the furnace in a continuous process the glass liquid is floated on top of molten tin in a tin bath from where it passes into the annealing lehr for cooling and solidifying into a continuous glass ribbon.
 
Float glass can be processed by various means into coated, tempered, insulating, and bent glass.