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  • BSI
    BS 7034-7:1988, ISO 7884-7:1987 Viscosity and viscometric fixed points of glass - Method for the determination of annealing point and strain point by beam bending
    Edition: 1989
    $305.31
    / user per year

Description of BS 7034-7:1988 1989

This part of ISO 7884 specifies a method of determining the annealing point and the strain point of a glass by beam bending. These values have been found useful for specifying the cooling programme in the production of glassware. The annealing point and strain point include a well-defined temperature decrease during the measurement.

At temperatures corresponding to the annealing and strain points, the viscosity of glass is highly time dependent. Hence, any viscosities that might be derived or inferred from measurements carried out according to this part of ISO 7884 cannot be assumed to represent equilibrium structural conditions. Therefore, the insertion of the strain point into the VFT-equation (see ISO 7884-1) is always impossible. The insertion of the annealing point causes in some cases marked failures.

NOTE The annealing and strain points by beam bending can also be determined using devices as specified in ISO 7884-4, but these devices are more expensive and the procedures lead to some viscosity-temperature and viscosity-time relationships besides the fixed points. In this part of ISO 7884, however, the device and procedure are restricted to the fixed-point determination.



Standard NumberBS 7034-7:1988, ISO 7884-7:1987
TitleViscosity and viscometric fixed points of glass - Method for the determination of annealing point and strain point by beam bending
StatusUnder Review
Publication Date1989-01-31
Identical National Standard OfISO 7884-7:1987
DescriptorsViscosity, Test equipment, Testing conditions, Bars (materials), Glass, Reference point determination, Bend testing, Specimen preparation, Moment of inertia, Deflection tests, Temperature, Strain, Calibration, Annealing, Loading, Precision, Formulae (mathematics)
ICS81.040.01 Glass in general
CommitteeLBI/1/2
ISBN0 580 16906 5
PublisherBSI
Pages16



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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