How do you make chemical tempered glass?
The glass is chemically strengthened by a surface finishing process. Glass is submersed in a bath containing a potassium salt (typically potassium nitrate) at 300 °C (572 °F). This causes sodium ions in the glass surface to be replaced by potassium ions from the bath solution.
What chemicals are in tempered glass?
The main ingredient when chemically tempering is potassium nitrate, which is heated to about 400 degrees to make it liquid. The glass is chemically hardened by being immersed in the molten potassium nitrate bath for a certain amount of time.
Where is chemically strengthened glass used?
Nowadays, the most common application of that kind of glass is on the screens of smartphones and other mobile devices. Chemically toughened glass has also been used for years in computer hard disks, photocopiers, and pharmaceutical devices.
Why is gorilla glass stronger than soda lime glass?
Gorilla glass and plain-old-soda lime glass have pretty much the same break resistance after the chemically strengthening process. However, AAS glass is more porous, so when it is chemically strengthened, the potassium ions go deeper into the surface of the glass.
What is the difference between physical and chemical tempering of glass?
Thermal tempering performs the same basic function as chemical strengthening — altering tension levels of different layers of glass — but does so physically as opposed to chemically. In the tempering process, glass is superheated and then immediately rapidly cooled.
When was chemically strengthened glass invented?
In the 1960’s, Corning developed Chemcor® glass, a chemically strengthened glass that was intended to be used in phone booths, prison windows, eyeglasses and automobile windshields.
What is Gorilla Glass NBT?
Gorilla Glass NBT is Corning’s unique glass solution for touch-enabled notebooks. Corning Gorilla Glass NBT delivers the cost-effective scratch and damage resistance that consumers have come to expect of the world’s leading cover glass solution to this new mobile device market.
Is borosilicate glass made in China safe?
Along with being reusable, borosilicate glass is a naturally derived product. Glass, unlike PVC and other food packaging materials, is the only material “Generally Recognized as Safe” by the FDA for storage of edible products.
How is borosilicate glass manufactured?
Manufacturing process Borosilicate glass is created by combining and melting boric oxide, silica sand, soda ash, and alumina. Since borosilicate glass melts at a higher temperature than ordinary silicate glass, some new techniques were required for industrial production.
What is glass chemical formula?
silica SiO2
All of the most important glasses are based on silica SiO2. Two glasses of special interest are soda-lime glass, used in windows and bottles, with composition 70SiO2. 10CaO. 15Na2O, and borosilicate glass, used in cooking and chemical glassware, with composition 80SiO2.