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The Glass Fusion
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GLASS

PRESENTATION
Glass is a solid amorphous material formed by the progressive solidification of a viscous liquid, obtained by the fusion of crystal minerals. (...)
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PRIMARY MATERIALS
Silica (SiO2, silicone dioxide) is the most common moulder of the vitreous lattice and is therefore the most important primary material for glass production. (...)
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THE GLASS FUSION
Glass is obtained by fusion in a very high temperature furnace of an homogenous mixture of minerals (vitrifiable mixture), called primary materials, which are mixed in appropriate proportions in weight, and glass scraps. (...)
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BLAST FURNACES
We know nothing or very little about blast furnaces before the invention of the blow-rod in the 1st century B.C. (...)
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ANNEALING FURNACES
Shaped glass (blown, moulded etc.) retains high temperature (500-600°C) and do not resist rapid spontaneous cooling.  (...)
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TYPES OF GLASS
Glass also exists in a natural state. The most common one is obsidian, a dark shiny material, which is very hard, formed in volcanic rocks and which man learnt to produce to make objects (blades, arrow-heads, etc.) over one million years ago. (...)
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