Glass used in a lot of human equipments comes from raw materials which pass the making process of glass. There are three steps in making of glass. They are melting, cooling, and forming.
The first step is melting. The raw materials containing silica which is from white sand or pulverized sandstone, soda (sodium bicarbonate), and lime which is from limestone are melted together at 2600 until 2900 Fahrenheit in furnace. The temperature depends on the composition of the raw materials. This step takes about twenty four hours.
The second step is cooling. After melting, the molten glass is then cooled until several hundreds degree at which it can be shaped. It has to be worked quickly to form it into the desired shape.
The last step is forming. The glass can be formed into bottles or plates. For glass bottles, molten glass is placed in a mould. Air is blown in and then the air pressure forces the glass against the side of the mould. When the glass cools and hardens, the mould is opened and a newly-made glass bottles removed. For glass plates, the sheet of glass is rolled flat along the assembly line. After it cools, the glass is ground and polished.
CAMELIA INDAH M.
16607256
Good writing, thanks.
The first step is melting. The raw materials containing silica which is from white sand or pulverized sandstone, soda (sodium bicarbonate), and lime which is from limestone are melted together at 2600 until 2900 Fahrenheit in furnace. The temperature depends on the composition of the raw materials. This step takes about twenty four hours.
The second step is cooling. After melting, the molten glass is then cooled until several hundreds degree at which it can be shaped. It has to be worked quickly to form it into the desired shape.
The last step is forming. The glass can be formed into bottles or plates. For glass bottles, molten glass is placed in a mould. Air is blown in and then the air pressure forces the glass against the side of the mould. When the glass cools and hardens, the mould is opened and a newly-made glass bottles removed. For glass plates, the sheet of glass is rolled flat along the assembly line. After it cools, the glass is ground and polished.
CAMELIA INDAH M.
16607256
Good writing, thanks.
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