LABORATORY GLASS

Technical Info Laboratory Glassware
DURAN ® -glass
• Borosilicate glass 3.3 acc. to ISO 3585
• Glass type 1, neutral glass acc. to USP 27, EP, DAB 10,
• Suitable for contact with foods, temperature stable, resistant to thermal
shock, chemical inert
Chemical properties:
Chemical
composition
Chemical resistance
class
Physical properties:
81 % SiO 2
13 % B 2 O 3
4 % Na 2 O/K 2 O
2 % AI 2 O 2
no heavy metal additives
- hydrolytic resistance
- acid resistance
- alkaline resistance
Transformation temperature 525 °C
Expansion coefficient α (20 to 300 °C) 3.3 10 -6 /K -1
Instructions for handling and use:
Maximum permissible
temperatures
Maximum
negative
temperature
Maximum
temperaturedeviation
Use in microwave
Working with
pressure and vacuum
Cleaning of DURAN ®
laboratory glass in
alkaline detergents
- DURAN ® laboratory glass generally 500 °C
- DURAN ® volumetric vessels
..(volumetric flasks, cylinders etc.) 180 °C
-70 °C
ΔT 100 K
Class 1, DIN ISO 720
Class 1, DIN 12116
Class 2, ISO 695
Yes
No, unless otherwise explicitly stated beside the individual article.
Always make sure that the vessel is in perfect condition.
- maximum contact time 30 minutes
- maximum temperature during cleaning 70 °C
- suitable for dishwasher
Soda-lime-glass
• Ideal for applications where there is no high thermal stress on glass
• Suitable for products where there is short-term chemical strain on glass
• For disposable articles
Chemical properties:
Chemical
composition
Chemical resistance
class
Physical properties:
69 % SiO 2
1 % B 2 O 3
3 % K 2 O
4 % AI 2 O 3
13 % Na 2 O
2 % BaO
5 % CaO
3 % MgO
- hydrolytic resistance
- acid resistance
- alkaline resistance
Transformation temperature 525 °C
Expansion coefficient α (20 to 300 °C) 9.1 10 -6 /K -1
Instructions for handling and use:
Class 3, DIN ISO 719
Class 1, DIN 12116
Class 2, ISO 695
Maximum permissible working temperature approx. 100 °C
Maximum negative temperature
Maximum temperature deviation ΔT approx. 30 °C
Use in microwave
Yes, possible
Working with pressure and vacuum No
Cleaning Soda-lime-glass
- not for dishwasher
- max. temperature during cleaning 60 °C
The thermal shock resistance of glass depends on its form, wall thickness and on
the surface and end quality of the glass objects used.
A rapid temperature change temporarily leads to high stress in the glass, whereby quick
and selective cooling processes are very dangerous as a thin outer layer of the glass
substance stretches over the hot inner core and comes under tension. Glass is
considerably more susceptible to tension than to compressive strain.
DURAN ® , because of its lower heat expansion, is considerably more resistant to sudden
temperature changes than soda-lime-glass.
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