A bottle can be cut in half with simple means

Glass has a peculiarity that very few people know or recognize. From a strictly physical point of view, the material is a liquid material that solidifies due to supercooling. This property can be used to cut a bottle in half without sawing or cutting. Exposure to heat and cooling are sufficient.

Halve without cutting or sawing

If you want to cut a bottle in half crosswise, you don't have to cut through the material. The specific material properties allow targeted partial heating and cooling to create a kind of controlled break in order to separate the bottle parts.

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What works across is not possible lengthways. A Dremel is required for this. Decorative lanterns can be made from a bottle without a bottom.

How to cut a glass bottle in half

  • Flammable cord / cord or
  • Copper wire
  • Cold water
  • Ice cubes
  • Flame source (candle, bunsen burner)
  • Dremel (€ 159.99 at Amazon *)
  • Water bucket
  • Emery paper

1. Set heat marker

As a heat marker and leader, you can use three different approaches. Using a Dremel or a hard scribing tool, you need to score the desired breaking edge around the bottle's belly. Alternatively, you can wrap a flammable string, cord, or copper wire around the belly of the bottle at the desired height. What is important is the close concern of the marker.

2. Heat the bottle

Turn the bottle over a candle flame or bunsen burner so that the marker heats up. A cord should "burn off" all around, a copper wire should glow and a crack should become milky.

3. Dip the bottle

Dip the heated bottle in a bucket of cold water to cool it. With added ice cubes you intensify the necessary "cold shock ". If the lower part of the tank does not fall off on the first dive, repeat the procedure. The halves will split by the third pass at the latest.

4th. Defuse broken edges

You can soften the sharp break edges with sandpaper with a grain size of 200. With skillful rotating movements over the flame source, you can also round off the edges by melting them off.

Tips & Tricks Make sure you proceed quickly when immersing the heated glass bottle. The hotter the glass on the marker line, the cleaner and faster it breaks. The bucket should not be too deep so that the height of the falling part of the bottle remains moderate.