BS 7034-8:1988
Current
The latest, up-to-date edition.
Viscosity and viscometric fixed points of glass Method for the determination of (dilatometric) transformation temperature
Hardcopy , PDF
English
31-01-1989
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National foreword
Committees responsible
Method
0 Introduction
1 Scope
2 Field of application
3 Reference
4 Definition
5 Principle
6 Apparatus
7 Test specimen
8 Procedure
9 Expression of results
10 Test report
Figures
1 Example of a dilatometer curve and the evaluation of
transformation temperature (521 deg C in this case)
of a glass
2 Example of the dilatometer curve of a glass in the
annealed and in a quenched state
Thermal expansion method.
| Committee |
LBI/1/2
|
| DevelopmentNote |
Supersedes 86/51631 DC. Also numbered as ISO 7884-8. (09/2005)
|
| DocumentType |
Standard
|
| Pages |
12
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
This part of ISO 7884 specifies a method of determining the (dilatometric) transformation temperature tg of a glass by means of the thermal expansion method. This temperature characterizes a certain glass transition range from the elastic brittle (low temperature) state to the viscous (high temperature) state of glass. The transformation temperature has been found useful for specifying cooling programmes and estimating the upper temperature limit of applicability of the respective glassware.
NOTE The more direct viscometric method of annealing point and strain point determination (see ISO 7884-7) serves similar purposes. The determination of the transformation temperature tg might be convenient if a suitable device for determining the coefficient of thermal expansion is available in the laboratory.
| BS 7030:1988 | Method for determination of the coefficient of mean linear thermal expansion of glass |
| BS EN 1595:1997 | Pressure equipment made from borosilicate glass 3.3. General rules for design, manufacture and testing |
| BS 4937-4:1973 | International thermocouple reference tables Nickel -chromium/nickel - aluminium thermocouples. Type K |
| BS 4937-6:1974 | International thermocouple reference tables Nickel-chromium/copper-nickel thermocouples. Type E |
| BS 7034-7:1988 | Viscosity and viscometric fixed points of glass Method for the determination of annealing point and strain point by beam bending |
| BS 4937-3:1973 | International thermocouple reference tables Iron/copper - nickel thermocouples. Type J |
| BS 7030:1988 | Method for determination of the coefficient of mean linear thermal expansion of glass |
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