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Glass Options – UPVC Glass Windows and Doors Manufacturer

The glasses are a vital part in insulating the windows and making these windows Energy SAVING. The following are the consideration while choosing the right glass Security, Energy Saving, Sound Reduction, Light.

Glass can be distinguished in two ways on the method of production


Float Glass

Float glass gets its name from the modern process used to create large, thin, flat panels from molten glass.

Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and various low melting point alloys were used in the past. This method gives the sheet uniform thickness and very flat surfaces. Modern windows are made from float glass. Most float glass is soda-lime glass, but relatively minor quantities of specialty borosilicate and flat panel display glass are also produced using the float glass process. The float glass process is also known as the Pilkington process, named after the British glass manufacturer Pilkington, which pioneered the technique (invented by Sir Alastair Pilkington) in the 1950s.

This is the first form of glass that is made. After which this glass can be processed to give you the features required like security, sun control, winter control, sound proofing.

Annealed Glass

Annealed glass is a piece of float glass that has been cooled in a slow and controlled manner. This slow cooling process reduces the internal stresses within the sheet of glass so that it becomes stronger. Float glass is generally annealed and is the starting point for further treatment into more advanced products through further processing such as laminating, toughening, coating, etc.. Annealed glass will break into large and sharp shards or pieces.


There are various options of glasses that are available. The same can be further categorized in 2 types of glasses

Plain Basic Glass – These are glasses which are made by various companies like Saint Gobain, AIS, Modi, and HNG to name some. These glasses can be used directly or can be used by processors. The types available are

  1. Reflective Glass
  2. Tinted glass
  3. Low-emission Glass
  4. Sand Blasted Glass
  5. Acid-etched Glass

Processed Glass –  These are glasses made by Glass processors who buy the glasses from the Basic glasses made by Factories and then process them to make them either toughened, Double glass, Safety glass.  

  1. Tempered (toughened) Glass
  2. Insulated (Double / Triple) Glass Unit (IGU)
  3. Laminated Glass
  4. Bullet-proof glass


Below is a chart rating the types of glasses under 4 factors as mentioned below. The same can be used to choose the type of glass required