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  • BSI
    BS 7034-3:1988, ISO 7884-3:1987 Viscosity and viscometric fixed points of glass - Method for the determination of viscosity by fibre elongation viscometer
    Edition: 1989
    $316.70
    / user per year

Description of BS 7034-3:1988 1989

This part of ISO 7884 specifies a method of determining the dynamic viscosity of glass by measuring the elongation of a glass fibre under a defined uniaxial stress. In addition, the viscosity-temperature relationship and the dependence of the viscosity on the thermal history can be determined.

NOTE Using this method, all parts of the tested material are subject to the same mechanical stress when the shape of the fibre is correct, the glass is homogeneous and isotropic, and the influence of gravity on the fibre itself can be neglected. The deformation is a pure elongation instead of a simple shear. Without major uncertainty, the determination of the shear viscosity by an elongation experiment is possible only when the material behaves like a Newtonian fluid.

The knowledge of equilibrium viscosities in the low-temperature range is useful for fitting suitable viscosity-temperature formulae over the whole range of glass viscosities and for a more detailed survey on thermal history influences than can be derived from fixed-point methods alone.



Standard NumberBS 7034-3:1988, ISO 7884-3:1987
TitleViscosity and viscometric fixed points of glass - Method for the determination of viscosity by fibre elongation viscometer
StatusUnder Review
Publication Date1989-01-31
Identical National Standard OfISO 7884-3:1987
DescriptorsDynamic viscosity, Temperature, Test equipment, Equations, Glass, Time, Specimen preparation, Calibration, Loading, Testing conditions, Viscometers, Glass fibres, Precision, Elongation, Fibres, Viscosity measurement, Viscosity
ICS81.040.01 Glass in general
CommitteeLBI/1/2
ISBN0 580 16902 2
PublisherBSI
Pages18

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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