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04October
Glass technical information.
Glass is an inorganic mixture fused at high temperaturewhich solidifies on cooling but does not crystalize. Its basic components, network formers and modifiers, are present in the common glasses in the form of oxides.
The Special features of Borosilicate Glass.
Borosilicate glass has a very high chemical resistance, nearly inert behaviour, a high usage temperature, minimal thermal expansion and the result high resistance to thermal shock are its most significant properties.
The optimum physical and chemical performance makes Borosilicate the ideal material for use in the laboratory and for the manufacture of chemical apparatus used in large-scale industrial plant. It is also widely used on an industrial scale in all other application areas in which extreme heat resistance, resistance to thermal shock, mechanical strength and exceptional chemical resistance are required.
Borosilicate glass has a very high chemical resistance, nearly inert behaviour, a high usage temperature, minimal thermal expansion and the result high resistance to thermal shock are its most significant properties.
The optimum physical and chemical performance makes Borosilicate the ideal material for use in the laboratory and for the manufacture of chemical apparatus used in large-scale industrial plant. It is also widely used on an industrial scale in all other application areas in which extreme heat resistance, resistance to thermal shock, mechanical strength and exceptional chemical resistance are required.
Physical Properties.
The maximum permissible operating temperature for Borosilicate glass is 500 C. Above a temperature of 525 C the glass begins to soften and above a temperature of 860 C it changes to the liquid state.As it has a very low coefficient of linear expansion, a feature of Borosilicate is its high thermal shock resistance.
Temperature resistance at low temperature.
Borosilicate can be cooled down to the maximum possible negative temperature and is therefore suitable for use with liquid nitrogen.
When workin at low temperatures, the effect of any expansion of a borosilicate vessel's contents must be borne in mind. During cooling and thawing ensure that the temperature difference does not exceed 100 K. In practice, therefore, stepwise cooling and heating are recommended.
The maximum permissible operating temperature for Borosilicate glass is 500 C. Above a temperature of 525 C the glass begins to soften and above a temperature of 860 C it changes to the liquid state.As it has a very low coefficient of linear expansion, a feature of Borosilicate is its high thermal shock resistance.
Temperature resistance at low temperature.
Borosilicate can be cooled down to the maximum possible negative temperature and is therefore suitable for use with liquid nitrogen.
When workin at low temperatures, the effect of any expansion of a borosilicate vessel's contents must be borne in mind. During cooling and thawing ensure that the temperature difference does not exceed 100 K. In practice, therefore, stepwise cooling and heating are recommended.
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