"An Authorised Dealer in India of Borosilicate Glass Duran ® Tubing, Capillary and Rod with 3.3 expansion produced by SCHOTT, Germany"
 
Products
Physical Attributes

The tensile strength of SCHOTT borosilicate glass tubing of 3.3 expansion in apparatus and plant design is calculated at 6 N/mm². The compressive strength, however, is about ten times as high. The safety of plant at customer's place, is highest with equipment made from SCHOTT tubes.
Optoelectronic control mechanisms continuously check the production process to guarantee both high quality and extremely tight tolerances for SCHOTT borosilicate glass tubing of 3.3 expansion.
Fulfils all major standards (e.g. DIN ISO 3585 and ASTM E438 type l, class A).
High optical and cosmetic quality, therefore no unwanted reflections or refractions.
The resistance of tubing and rod to thermal shock depends on many different factors. Some of these are the wall thickness, shape and size of the chilled surface, the state of the surface, the stress already present in the glass, and the end finish. As it has a very low coefficient of linear expansion (3.3 x 10-6 K-1), a feature of SCHOTT borosilicate glass tubing is its high thermal shock resistance up to T = 100K.
According to DIN EN 1595 "Pressure Equipment made from Borosilicate Glass 3.3 expansion-General Rules for design, Manufacture and testing" SCHOTT borosilicate glass tubing of 3.3 expansion is an approved material and may be used for the construction of pressure equipment.
SCHOTT borosilicate glass tubing can be cooled down to the maximum possible negative temperature and is therefore suitable for use with liquid nitrogen (approx. - 196 °C). In general SCHOTT borosilicate glass tubing products are recommended for use down to - 70 °C. During thawing ensure that the temperature difference does not exceed 100 K.
Optical properties:- In the spectral range from about 310 to 2200 nm the absorption of SCHOTT borosilicate glass tubing of 3.3 expansion is negligibly low. It is clear and colourless. Fairly large layer thicknesses (axial view through pipes) appear slightly yellowish/greenish.
Water resistance:- SCHOTT borosilicate glass tubing 3.3 expansion meets the requirements of hydrolytic resistance class 1 of glass grains to ISO 719-HGB 1. In the determination by the glass grain titration method to DIN 12 111/ISO 719, after heating of 1g of glass grains in water at 98°C for 1 hour, only 0.026ml of HCl (0.01mol/l) are consumed. This corresponds to an alkali release of 0.008mg Na2O per 1g of glass grains.
Acid resistance:- SCHOTT borosilicate glass tubing of 3.3 expansion meets the requirements of acid resistance class 1. In the determination of acid resistance to DIN 12 116, an exposure of fire-polished SCHOTT borosilicate glass tubing of 3.3 expansion surfaces to boiling 18% hydrochloric acid for 3 hours results in a weight loss of only 0.3mg/dm2.
Alkali resistance:- SCHOTT borosilicate glass tubing of 3.3 expansion meets the requirements of alkali resistance class 2 to ISO 695-A2. In the determination of alkali resistance to DIN 52 322/ISO 695, an exposure of fire-polished SCHOTT borosilicate glass tubing surfaces to boiling in a mixture of equal volumes of sodium hydroxide solution (1mol/l) and sodium carbonate solution (0.5mol/l) for 3 hours results in a weight loss of only 134mg/dm2.

  SCHOTT® and DURATAN ® are registered trademarks of SCHOTT. DURAN ® is a registered trademark of the DURAN GROUP GMBH.
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