The windshields of cars are made of a special type of glass specifically designed for this purpose. This glass is composed of silica, fine sand, soda ash, dolomite, waste glass and limestone, with small amounts of potassium oxide and aluminum oxide added in certain formulations. Laminated glass is created by sandwiching a thin layer of vinyl between two layers of glass. This makes the window thicker and stronger, and it is considered one of the safest types of glass due to its difficulty to break or shatter.
Most vehicle windshields are made from laminated glass. Rear glass, also known as rear window glass, rear windshield or rear glass, is the piece of glass opposite the vehicle's windshield. It is made from tempered glass, also known as safety glass, which breaks into small round pieces when shattered. This is different from a front windshield which is made from laminated glass, which consists of two pieces of glass with vinyl in the middle.
Laminated glass is created by combining a layer of polyvinyl butyral (PVB) between two pieces of glass and then sealing them with a series of pressure rollers and heat. This process chemically and mechanically bonds the PVB to the glass. Safety glass is used in all automotive glass due to its ability to reduce the likelihood of injury if it breaks. Windshields are manufactured through a lamination process which involves two pieces of float glass with a thin layer of vinyl between them.
The three pieces are then laminated together by applying heat and pressure in an autoclave oven. When a small object hits a piece of safety glass, usually only the outer layer breaks. Tempered glass is created by rapidly heating and then cooling the glass to room temperature by introducing it through a blower system. This process produces a sheet of glass having a uniform thickness and flat surfaces by floating molten glass on a bed of molten metal.
The modern vehicle incorporates more glass than ever before, including larger windshields, sunroofs and even complete roof replacements with panels made from glass. Lamination gives the glass strength as it adheres to the inner layer of tear-resistant plastic when broken. Glass manufacturers continue to explore new ideas to make their products stronger, safer and more adaptable to new vehicles.