Very high chemical resistance
DURAN® borosilicate glass is highly resistant to water, neutral and acid solutions, concentrated acids and acid mixtures, and to chlorine, bromine, iodine and organic substances. Its chemical resistance is superior to that of most metals and other materials, even during prolonged periods of exposure and at temperatures above 100 °C.
Only hydrofluoric acid, concentrated phosphoric acid and strong alkali cause appreciable surface removal of the glass (glass corrosion) at elevated temperatures (>100 °C).
DURAN® has the following approximate composition(%):
Due to its good hydrolytic resistance, DURAN® meets the requirements of the USP, EP and JP and is a neutral glass that corresponds to glass type 1. It can therefore be used in an almost unrestricted way in pharmaceutical applications and in contact with foodstuffs.
Due to the inert behavior of DURAN® there is no contact or interaction (e. g. ion exchange) between medium and glass, which avoids interfering effects.
High usage temperature
The maximum permissible operating temperature for DURAN® 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.
DURAN® can be cooled down to the maximum possible negative temperature and is therefore suitable for use with liquid nitrogen (approx. – 196 °C). During such use/ freezing. In general DURAN® products are recommended for use down to – 70 °C. During thawing ensure that the temperature difference does not exceed 100 K.
DURAN® glassware is suitable for use in microwaves.
Minimal thermal expansion & high resistance to thermal shock
As it has a very low coefficient of linear expansion (3.3 x 10–6 K–1), a feature of DURAN® is its high thermal shock resistance up to ΔT = 100 K.
In the spectral range from about 310 to 2200 nm the absorption of DURAN® is negligibly low. It is clear and colorless. Fairly large layer thicknesses (axial view through pipes) appear slightly yellow/greenish.
You can find special properties of DURAN® laboratory glassware within the technical information section of the catalogue.