How to Split a Glass Bottle in Half

This tutorial will teach you how to split anything made of glass in half. It uses fire and cold water to create a temperature difference that will break the glass.

Steps

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    Attach the string tightly about 0,3 inches (1 cm) below where you want your jar to be cut. Then cut the useless pieces of string hanging from the knot.
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    Put alcohol on the string with the brush. Add as much as the string can absorb (be careful not to put too much of it, it mustn't flow from the string).
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    Hold the bottom of your jar (be careful not to have alcohol on your hands) and light the string.
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    When the string makes a ring of fire, put the jar in the water, but make sure the water doesn't put out the flames. Wait until the jar breaks
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    .
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    When you hear it's broken, make sure it did all around the jar. If it's almost done, you can finish it pulling a little with you hands. If your string run out of alcohol before it's broken, quickly put another load and do it again.
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    Be careful with the cutting edges.

Tips

  • The string must be under the cutting line because it's the flames which will heat the glass.
  • If you want a clean cut, draw the cut line and cut it firmly using the glass cutter. Be careful : if you make an error with the glass cutter, you can't go back, it will give a bad shape to your cut.
  • The result will depends on the thickness of your jar, the water's temperature, the kind of string you used.

Warnings

  • 90% alcohol is dangerous. Close the bottle to avoid fumes. Put the bottle away from any source of fire.

Things You'll Need

  • A glass bottle or jar, or anything in glass
  • A brush
  • A rather thick string (3mm diameter, 1m long) Very important : the string must not be plastic made and must be able to absorb liquid
  • A bottle of 90% alcohol
  • A lighter
  • A bowl of cold water
  • If you want to make it clean you can add : A glass cutter

Article Info

Categories: Glass and Stained Glass Projects