Cooling of Formed Glass Products

3 Melting and Forming Glass Half Products for Microstructuring 

Tr = room temperature To= annealing temperature Tu strain point 

The mechanical surface treatments consist of grinding, lapping (smoothing) and polishing. For a detailed description of the processes involved the reader is refered to the literature [184, 284, 550] or Sect. 5.2.2. The brief description that follows is only related to surface treatments in general. 

The roughness of the ground surface is comparable to the dimensions of the chips that are formed during the process. However, simultaneous to the chipping, new longitudinal failure and radial cracks form as shown in Fig. 3.22. 

Finally the glass part is polished in order to reduce the surface roughness below a value of 10 nm. The polishing powders used have a particle size of 

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