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What does glass actually consist of?
“Take 60 parts sand, 180 parts ash from sea plants, 5 parts chalk - and you get glass.”
Making glass is that easy if you follow the recipe from the clay tablet library of the Assyrian king Ashurbanipal who ruled around 650 BC. Essentially, the ingredients are still the same.
Glass consists mainly of molten sand. In addition, it also consists of several substances of natural origin. Temperatures of around 1600 degrees Celsius are required for its production.
Most glass is produced according to the following mixing ratio:
Depending on the final product, the composition is slightly varied.
Long before humankind discovered glassmaking, materials were fused by the heat of volcanoes. This is how the first natural glass was created: the night-black obsidian, from which arrowheads and the first mirrors were made.
Links on the topic of sand: (in German only)
SRF Trend – Das Wirtschaftsmagazin, 1. Mai 2020
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30. August 2020
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