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Physical properties of
DURAN® Borosilicate Glass |
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Physical properties
A feature of DURAN® borosilicate glass, which makes it especially suitable for laboratory use, is its thermal resistance. The following individual properties are of particular importance.
Temperature and thermal shock resistance when heated
The maximum permissible operating temperature for DURAN® is 500°C. Above a temperature of 525°C the glass begins to “soften”, i.e. it begins to change from the solid state to the viscous state.
DURAN® is not only highly resistant to chemical attack, but it also has a very low coefficient of thermal expansion and, as a result, a high resistance to thermal shock. This thermal shock resistance exceeds that of ordinary glass by a factor of three. That means that any change from hot to cold can be handled very well (up to Dt = 100K). The linear coefficient of expansion of DURAN® (20/300°C) is 3.3 · 10-6/K. That means that for an increase in temperature of 1K the glass only expands by 3.3 · 10-6 relative units of length. That is so minimal that hardly any stress is set up in the glass and the glass does not break when, for example, boiling water is poured into it.
Temperature resistance at freezing temperatures
DURAN® can be cooled down to the maximum possible negative temperature. That means that DURAN® is also suitable for use in liquid air (approx. -192°C).
In general DURAN® products are recommended for use down to -70°C. When cooling down and thawing, care must be taken to avoid a temperature difference of more than 100K.
When freezing substances in such items as DURAN® bottles or DURAN® test tubes, the container should only be filled to a maximum of ¾ of its capacity and it must be frozen on a 45°-angle.
Use in the microwave
DURAN® is suitable for use in microwaves.
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| Fairs & Events |  | |
03.12.-06.12.2008
Chemical Instrument Laboratory CIL 2008 Jakarta, Indonesia
11.05.-15.05.2009
ACHEMA Frankfurt, Germany
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