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BS 7034-4:1988
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Viscosity and viscometric fixed points of glass Method for the determination of viscosity by beam bending
Hardcopy , PDF
English
31-01-1989
National foreword
Committees responsible
Method
0 Introduction
1 Scope and field of application
2 Reference
3 Principle
4 Apparatus
5 Preparation of tet specimens
6 Procedure
7 Expression of results
8 Test report
Annex
Bibliography
Tables
1 Preliminary values for the estimation of the time
interval delta t1 and for a midpoint deflection
delta f = 0,1 mm, valid for the medium viscosity
range according to 6.2.1
2 Preliminary values for the estimation of the time
interval delta t2 and for a midpoint deflection
delta f = 0,2 mm, valid for the lower viscosity
range according to 6.2.2
3 Preliminary values for a measuring device for
viscosities in the upper viscosity range according
to 6.2.3
Figures
1 Principle of viscosity determination by beam bending
2 Example of a testing device for the beam bending
method
3 Correction factor fl for the estimation of the time
interval delta t'1 according to equation (9), taking
into account spans ls other than that given in table
1
4 Correction factor fI for the estimation of the
measuring time delta t'1 according to equation (9),
taking into account cross-sectional moments of
inertia Ic other than that given in table 1
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