Introduction to Clear Float Glass

Clear float glass is one of the common types of glass that is available today. However, many people are aware of this. This can be attributed to the fact that people rarely hear of the term. Rather, to the general public, all glass products, regardless of whether they are tempered, annealed or float, they are referred to only as glass. This article serves to shed some light on the ever so common type of glass product around us – the clear float glass.

Basically, the clear float glass is a sheet of glass that is produced when a film of molten glass is floated on a bed of molten metal. The type of commonly used molten metal is tin. The clear float glass that is produced using this technique has the benefit of having uniform thickness and also has a uniformly flat surface.

Clear float glass is manufactured using materials that are commonly used to manufacture this type of product. This includes soda ash, dolomite, limestone and also sodium sulfate. For colored glass products, other chemicals are added to give them color. Once all the raw materials are processed, they are mixed together in a batch mixing process to produce clear float glass. The mixture is then heated up to around 1500 degrees Celsius to form a mixture off molten material. After the mixture has turned into a molten form, the temperature of the mixture is the brought down by 300 degrees Celsius so that it stabilizes at 1200 degrees Celsius. This is to ensure that mixture of the molten glass has a uniform specific gravity.

The next process is to feed the molten material in to a bath of molten tin. This is done by pouring it into the tin bath using a ceramic lip. This ceramic lip is also known as a spout lip. A tweel is used to control the amount of substance poured into the tin bath. For a specific mold, the amount poured into the bath will dictate the thickness of the finished product.

Tin is selected as the molten base metal as it is very abundant in terms of availability. Hence this reduces the production cost for clear float glass. Also, tin is easily recyclable making it an even more ideal choice. Besides this, tin is much more dense than glass. Hence, when it solidifies it rises to the top forming the finished product.

Clear float glass has been around for a long time. The demand for it is continually rising. Common uses of it are window panes, display cases, furniture and electrical appliances.


Post time: 07-25-2017