WHEATON Glass Warehouse
a division of WHEATON Industries Inc.
1000 N 10th St.
Millville, NJ 08332-2093
800.833.0410
856.825.9014 (F)
please contact: Bill.Dempsey@Wheaton.com
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Physical
Data
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Mean coefficient
of linear expansion
 20/300
acc. to ISO 3585 |
3.3 •
10-6 K-1
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Transformation
temperature Tg
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525°C
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Temperature
fixed points at viscosity
 in
dPa s: |
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1013
upper annealing point
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560°C
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107.6
softening point
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825°C
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104
working point
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1260°C
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Maximum
short-time working temperature
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500°C
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Density
p
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2.23g
cm-3
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Modulus
of elasticity E
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64 •
103 N • mm-2
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Poisson's
ratio
 |
0.20
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Thermal
conductivity
 w
at 90°C |
1.2 W
• m-1K-1
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Temperature
for the specific electrical resistance of 108
• cm (DIN 52326) tk 100 |
250°C
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Logarithm
of the electric volume resistance (
• cm) |
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at 250°C
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8
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at 350°C
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6.5
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Dielectric
properties (1 MHz, 25°C)
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Dielectric
figure
 |
4.6
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Dielectric
loss factor tan
 |
37-10-4
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Refractive
index (
= 587.6 nm)
nd |
1.473
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Stress-optical
constant (DIN 52314) K
|
4.0 •
10-6 mm2 • N-1
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| Pressure Resistance of DURAN Tubing and Capillary | ||||||||||||||||||||||||
| Calculation of pressure resistance (p) for a given Wall Thickness (WT) and a given Outside Diameter (OD): |
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| Calculation of the Wall Thickness (WT) WT at a given pressure resistance (p) and Outside Diameter (OD): |
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| Resistance parameter for DURAN Borosilicate Glass 3.3: K/S = 7 N mm•-2 as per DIN EN ISO 1595 Standard Draft Pressure equipment made from Borosilicate Glass 3.3: General rules for design, manufacture and testing. Pressure resistance (p) is also impaired by the following: | ||||||||||||||||||||||||
| -
Difference in temperature between inside and outside wall - Surface Quality - End Finish |
-
Observance of Conditions of Installation as per Pressure Vessel Regulations -Tubing Length |
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| Exact calculations are available on request. | ||||||||||||||||||||||||
| Resistance to Thermal Shock | |||
| According to DIN ISO 718, the resistance to thermal shock is the difference in temperature between the hot test sample and the cold water bath (room temperature) at which 50% of all test samples show a tendency to crack when quickly immersed. Resistance to thermal shock of tubing, capillary and rod is dependent on the wall thickness, the shape and size of the quenched area, the state of the surface, the stress which may be present and the end finish. Fast, uneven heating or cooling can easily lead to breakage as a result of tensile strength. It is recommended not to exceed a temperature difference of 120°C. For large wall thicknesses, this temperature is limited to lower values. Listed below are some measured values to illustrate the resistance to thermal shock of DURAN Borosilicate Glass 3.3 tubing and rod. These should be used only as reference values as considerable differences between tubing/rod of the same dimensions are possible. | |||
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Tubing
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OD 50.5/
WT 5.00 mm: 220°C |
Rod
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Diam.
24.0 mm: 140¡C
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| Chemical Composition (main components in approx. weight %) | |||
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SIO2
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B2O3
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NA2O
+ K2O
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AL2O3
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|
81
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13
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4
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2
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Chemical Data
| Hydrolytic Class (ISO 719) | 1 | |
| Acid Class (ISO 1776) | 1 | |
| Alkali Class (ISO 695) | 2 | |
DURAN Borosilicate Glass 3.3 is highly resistant to water, neutral and acid solutions, concentrated acids and acid mixtures, and to chlorine, bromine, iodine and organic substances. The chemical resistance of this glass is superior to that of most metals and other materials, even when exposed to long processing periods and temperatures above 100°C.
A slight release of mainly monovalent ions takes place after exposure of the glass to water or acids. A very thin layer of impervious silica gel is subsequently formed on the surface of the glass which in turn slows down further attack. At higher temperatures and in more concentrated forms the glass surface is subject to increased attack by hydrofluoric acid, hot phosphoric acid and alkaline solutions.
Transmission
The excellent properties of DURAN tubing, capillary and rod provide for good workability when forming and cutting the glass with the normal techniques for technical glass. To eliminate temporary stress as a result of the working process, the glass should be well heated to a maximum temperature of 550 ¥C and kept at this level for a maximum of 30 minutes; for a thinner wall only a fraction of this period is necessary. In order not to affect the chemical stability of the glass, annealing time should be kept as short as possible. We recommend the annealing temperatures given in the table below:
Annealing Schedule
| Wall Thickness in mm |
Temperature
Range
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||
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550
to 480°C
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480
to 400°C
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400
to 20°C
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| up to 3 |
12°C/min
|
24°C/min
|
up to
480°C/min
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| up to 6 |
3°C/min
|
6°C/min
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up to
120°C/min
|
| up to 12 |
0.8°C/min
|
1.6°C/min
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up to
32°C/min
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If an article needs to be annealed
several times, the sum of all annealing periods at 550°C should not
exceed 2 hours. DURAN products can be fused stress-free with borosilicate
glasses of the same type and can be processed and annealed at the same
temperatures. Printing on DURAN tubing, capillary and rod can be done
with silver copper diffusion and screen-printing dyes.
For Questions or to Submit Specifications for a Quote
Call: 1-800-833-0410 or e-mail at: Bill.Dempsey@Wheaton.com
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