Types of Glass

Borosilicate Glass

Borosilicate Glass (Glass Type)Most of us are more familiar with this type of glass in the form of ovenware and other heat-resisting ware, better known under the trade name Pyrex.

Borosilicate glass (or sodium-borosilicate glass) is made mainly of silica (70-80%) and boric oxide (7-13%) with smaller amounts of the alkalis (sodium and potassium oxides) and aluminium oxide.

This type of glass has a relatively low alkali content and consequently has both excellent chemical durability and thermal shock resistance - meaning it doesn't break when changing temperature quickly. 

As a result of these properties, sodium borosilicate glass is widely used across the chemical industry, pharmaceutical sector for laboratory apparatus, for ampoules and other pharmaceutical containers, various high intensity lighting applications and as glass fibres for textile and plastic reinforcement - as well, of course, for common household oven and cookwares.

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Because of the differences in the various methods of manufacture, the industry is divided into 5 main sections under the general headings: Container glass; flat glass; scientific/technical glass; domestic glass; and fibre glass.


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