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Published byKenna Ludington Modified over 10 years ago
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Topics What is glass Why glass breaks Chemically strengthened glass how it works make at home? Tempered glass Laminated glass Special types
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(Regular) glass Used everywhere Main compounds: Silicon dioxide (SiO 2 ) Sodium oxide (Na 2 O Sodium carbonate (Na 2 CO 3 ) Brittle
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Why glass breaks? Compression X Tension Microscopic defects
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Chemically strengthened glass Regular glass bathed in salt(s) Sodium atoms -> potassium atoms Only thin surface is treated
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Chemically strengthened glass Constant compression Higher force to break Flexible
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Gorilla glass Commercial brand Smartphones, tablets… Patented chemical mix, process (temperatures) …
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Try it at home? 2hours+ 400°C Molten KNO3 Strength increase: 3-4 times Youtube channel „Applied science“
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Unbreakable? Nope…
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Tempered glass Thermal process Surface rapidly cooled 6 times stronger Shatters into small pieces good/bad?
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Laminated glass Glass+glue+glass Stays together Safety/security feature Skyscraper windows Windshields … Soud isolation
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Fused quartz/silica glass No added ingredients – pure SiO 2 High temperature (2000°C) Halogen bulbs UV transparent Special applications
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Sugar glass Easy to break Used in movies or food decorations Molten sugar+water+corn syrup
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Questions? Every application needs another type Glass looks trivial but is it? Questions?
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