Glassware and Machinery at the industrial scale still continues to be semi-automated manufacturing with a lot still depending upon the skills of the glass craftsman. It takes years of practice to master the art where one has to shape the glass when it is still red hot. One has to weather the heat of the molten glass and also shape it, check the dimensions, and transform it into the required piece or article.
The glass origin, the type, and the thickness of the glass plays the important role in having the good quality glass piece which shall finally be a part of the glass piece or glass plant. If the glass origin is German, it is better. ATR uses Schott Duran Borosilicate 3.3 imported from Germany. (Borosilicate glass is a type of glass that contains boron trioxide which allows for a very low coefficient of thermal expansion. This means it will not crack under extreme temperature changes like regular glass. The meaning of 3.3 is that the coefficient of linear expansion of this glass is 3.3 X 10-6 K-1 ). Most of the Glass is made by modifying the glass tubing. It is only Schott Germany who makes Glass tubing upto 16″ diameter. Hence if we are in a position to make the Glass pieces by glass tubings upto 16″ diameter, then we get the glass thickness of 7mm. If we have to go beyond the 16″ of glass then the glass thickness we get is 5mm.