DURATAN®
Thermally prestressedtubing of special glass

2SCHOTT is a leading international technology group in the areas of
specialty glass and glass-ceramics. With more than 130 years ofoutstanding development, materials and technology expertise weoffer a broad portfolio of high-quality products and intelligent
solutions that contribute to our customers’ success.
With a production capacity of more than 140,000 tons and production
sites in Europe, South America and Asia, SCHOTT’s business segment
Tubing is one of the world’s leading manufacturers of glass tubes,
rods and profiles. Approximately 60 glass types are produced in large
external diameters and a variety of lengths based on site overlapping
strategies in development, production and quality assurance.
SCHOTT Tubing provides customised products and services forinternational growth markets such as pharmaceuticals and electronics
as well as industrial and environmental engineering.

3The DURATAN® borosilicate glass tubes by SCHOTT have high impact strengthand thermal shock resistance, scratch resistance and light transmission and are therefore
ideally suited for external use.

45SCHOTT DURATAN®
Prestressed Borosilicate
Glass Tubing

Special glass tubing for use in extreme conditions
As one of the leading manufacturers of tubing, capillaries
and rods, SCHOTT offers a prestressed, highly chemicallyresistant borosilicate glass with a low thermal coefficient ofexpansion: DURATAN®.
DURAN® with advanced properties
Using a thermal toughening process, the wall of the tubing
can be prestressed which results in glass tubing with highresistance to tensile stress and mechanical impact.
If a DURATAN® tube were to break, it will disintegrate into
small blunt fragments, which minimizes the risk of injury.
The base glass for DURATAN® is DURAN®. The toughening
process enhances the properties. This means the specificfeatures of DURAN®, such as the high chemical resistanceand high resistance to UV radiation in external use, aremaintained.
Advantages at a glance... compared to non-toughened glass
On average 2-3 times higher resistance to tensile stressand mechanical impact
Fine break pattern, similar to tempered
safety glass (ESG)
Increased bursting strength where there is internal overpressure... compared to plastic
Very high UV resistanceChemically resistant
Scratch-resistant
Can be used accross a wide temperature range

Left: Detailed view of a DURATAN ® glass tube following manual break(middle). To show the break pattern, adhesive film was wrapped aroundthe tube.

67

Drop tests to determine mechanicalimpact strength
The mechanical impact strength of
hard solid bodies, for example of glass,is determined by a drop test.
DURATAN® is randomly tested using aball drop test. A defined 1 kg test pieceis dropped onto the glass tube from aheight of 400 mm, which correspondsto energy of around 4 Joules (J). The
tube at least has to resist this impact.
The drop height in the test is thenincreased by 100 mm ≈ 1 Joule until
the damage occurs. Then the fine break
pattern in examined.
Upon special customer request,
strength tests on a statistical basis
on defined tube dimensions can berequested.

Outerdiameter[mm]

Wallthickness[mm]

Dimensions for DURATAN®

Weibull T value(characteristic
fracture energy) DURAN®notprestressed[J]

Weibull T value(characteristic
fracture energy)
DURATAN®
prestressed[J]Length[mm]Tube diameter [mm]Increased resistance to mechanical shock

450400350300
250200150120

5290approx. 13approx. 4120100
50

Drop test results
for a dimension with Weibull analysis of 50 tubes each (DURAN® and DURATAN ®)

1.700

1.200

1.000

700

500

200

035

Tube length [mm]The diagram shows standard dimensions; further dimensions upon request

79Wall thickness [mm]Resulting stress profilein the tubing wall, for various wall thicknesses,
such as the tube diameter 120 mm.

Safety lights in explosive atmospheres
Sight glasses and display cylinders for product presentations
Sight glasses in pipeline construction
Tunnel lighting

5040

Outdoor lighting
Interior and exterior architecture
Decoration

302010001234567891010

Compressive stress[N/mm2]Compressive and tensile stress
During the prestressing process,the surface layers are subjected tocompressive stress, while the inside of
the tubing is under the influence oftensile stress.
Breakage is only triggered by a force
of external impact exceeding thiscompressive stress of up to 50 N/mm2on the surface.

Tensile stress[N/mm2]

Examples of applications

2030
WD 3WD 5WD 7WD 94050
Wall thickness [mm]Image by Adrian Haddad for Qela

Explosion-proof lamps

Product presentation: Qela Store, Quatar

Tubing
SCHOTT AG
Erich-Schott-Strasse 14
95666 Mitterteich
Germany
Phone +49 (0)9633/80-0
Fax +49 (0)9633/80-614
info.tubing@schott.com
www.schott.com/tubing

5Agb03.2015KR / Printed in Germany