How to Cut Tempered Glass

There is a special process that you must follow when cutting tempered glass, otherwise it will shatter and no longer be usable. It is important to use extreme caution as you go through the process so that you do not get injured.

Step 1: Clean the Tempered Glass Thoroughly

Make sure there is no dust or dirt particles that could get in the way of a clean cut. Clean it thoroughly with window washing solution and allow it to dry completely.

Step 2: Anneal the Glass

Heat the glass in a craft oven until it reaches 900 degrees Fahrenheit, then turn off the oven and allow the glass and oven to cool for 8 hours. This will make the glass so that it is no longer tempered and will not shatter when cut.

Step 3: Prepare the Glass for Cutting

After the glass has been annealed, place it on a flat surface and place a t-square over the place you wish to cut it. The dip your glass cutter into kerosene. This will allow for a cleaner cut.

Step 4: Cut the Glass

Pressing down with moderate pressure, run the cutter along the straight edge in one smooth motion to make a thin line across the top of the glass. Do not run the cutter over the glass again. Place the dowel under the line and press downward on both sides of the dowel, making sure to wear protective clothing. This should snap the glass evenly down the line.

Step 5: Smooth the Edges

Smooth the edges by running them against a whetstone. Not only will this make the glass smoother and less dangerous to carry, it will also strengthen the glass.