HOW GLASS IS MADE

There are several steps you need to do when you want to make a glass. First, you need to collect all of the ingredients. The ingredients are sand (mineral contains silica), soda (Na2CO3) and limestone (CaO). Second, after getting all of the ingredients, put them all into a furnace and then burn them with proper temperature, it is about 1400 degrees of Celsius. Third, separate the processed ingredients into two parts, the first part is used to make plate glass and the second part is used to make bottle glass. For the first part, flow the mixture (processed ingredients) into a melting pot. There, the molting pot grinds and polishes the both sides of mixture to make it smooth and pure, then the part of molting pot called roller carries the mixture. For the second part, heat the mixture up to 700 degrees of Celsius until the sand melts and becomes fluid. At this point, the raw material is already melted and the output of that process is called molten glass. Then flow it into a mold in the end of a tube. In the end of making plate or bottle glass process, cool the mixture to get the solid form of either plate glass or bottle glass. To make a high quality of bottle glass, place the molten glass in an annealing oven, then cool it so slowly that the glass is not able to shatter from the strain of sudden temperature change.

Ario Yudo Husodo

16507042

Good work, thanks.

Glass Production

Glass is made by two separated processes, melting and forming. First, sand (mineral contains silica), limestone (CaO), and soda (Na2CO3) are put together in a melting pot in a furnace. Next, the pot is heated up to approximately 1200-degree Celsius. At this point, the raw material is already melted, forming a reddish liquid, that is called molten glass. Second process is forming. In this part, molten glass is formed into plate glass and bottle, the basic form of every glassware such as lamp tube and sauce bottle. Molten glass is poured to a series of rolling pin. Then the glass is pressed by the rolling pin to be a plate. After cooled down with air, the glass formed a hard-thin-plate glass. To make bottle glass, molten glass is poured to a bottle-shape mold. Then, compressed air is injected into the center of the mold so it will press the glass outward and make the center of the glass hollow. Next, the mold is cooled down and the glass is taken out as a bottle. So after these processes molten glass becomes plate glass and bottle.

Kris Derril S.
16507088

Very well written.