Can melt glass

Glass bottles melt between 850 and 1500 degrees Celsius

Oven indispensable and safety aspects

If glass bottles are to be melted, a furnace that can achieve at least 540 degrees Celsius is always required. Even if a flame is used for the actual melting process, the glass must be "tempered" or "annealed" at around this temperature. In this way, certain material cracks and cracks can usually be avoided after the final cooling.

An essential and often overlooked safety aspect is the failure to recognize the glass temperature. In contrast to many other materials, heated and hot glass do not display any visually recognizable warning signs such as glow. If the glass bottle has been cut across or lengthways, the sharp cut edges should be defused by grinding or melting.

Temperature requirement and possible heat sources

The deformability of glass bottles begins at around 600 degrees. This temperature is reached by the following aids:

  • Bunsen burner
  • Blowtorch (€ 27.90 at Amazon *)
  • Camping gas cartridge

In order to liquefy the, strictly scientifically speaking, already liquid material glass, common gas welding devices generate sufficient temperatures.

  • Propane burner
  • Butane gas burner
  • Oven with a maximum temperature of 1500 degrees

A cooling break is indispensable

After a glass bottle has melted in any intensity, a “break” must be taken on the way “back” to the cooled-down initial state. The deformation of the glass bottle has developed tension, which must be relieved as best as possible during this break.

Theoretically, this is a kind of virtual melting point or melting start, which is around 530 degrees. After the peak temperature, the glass bottle or its successor must be kept at this temperature for at least one hour. This prevents the glass bottle from exploding with a new shape with a volume of contents if the tension suddenly "discharges".

When melting glass bottles, you should always expect "shrinkage". Since different types of bottles consist of different glass compositions, the melting properties vary. Before you heat a particularly beautiful or rare specimen, practice with several similar prototypes and record your results.

Author: Stephan Reporter

* Affiliate link to Amazon

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