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Inspect the glass for imperfections. In this case, imperfections are not a bad thing. During the tempering process, small particles can be melted into the glass or leave scratches along the surface, so imperfections are common. If you do not have access to view the edges or look for a bug, this is the next best method to check whether the glass is tempered or not. Annealed glass does not go through such a rigorous heating process, so imperfections most likely not be as prevalent.In this case, imperfections are not a bad thing. During the tempering process, small particles can be melted into the glass or leave scratches along the surface, so imperfections are common. If you do not have access to view the edges or look for a bug, this is the next best method to check whether the glass is tempered or not. Annealed glass does not go through such a rigorous heating process, so imperfections most likely not be as prevalent.
Both regular and tempered glass are made with similar materials. Sand, recycled materials, soda ash and limestone, are used to make the panes that we put into windows and doors today.
The main difference between the two types comes down to the manufacturing processes that are used. Regular glass is created using an annealing process that involves heating the materials to the stress relief point. Then, the molten materials are allowed to cool at a controlled rate that allows for some degree of strength.
Tempered glass goes through an additional processing technique. A finished piece of regular glass is taken through another step of being heated to an extremely high temperature.
Once this is complete, the pane is then cooled with high pressured air from nozzles that hit specific parts of the surface. This process is called quenching. The rapid change from hot to cold temperatures strengthens the outer surface of the pane.
The most obvious benefit of choosing the standard option is the price. Since it only has to go through one process, this type tends to be less expensive.
Standard panes are softer and capable of being reworked. This allows for us to do customized edges and other types of reshaping that give glass tabletops and shelves a unique look.
You’ll want to use this type anywhere that extra strength is required. Tempered panels are ideal in bathrooms where slippery surfaces increase the risk of personal injuries from broken glass.
Since this type breaks into smaller, less sharp pieces, it is considered safer than the regular kind.
These are also important for use in windows and doors that sit close to the ground surface. In some cases, local building codes and ordinances require tempered glass to be used.