Active standard | Published: 26/11/1987

ISO 7884-7:1987

Glass — Viscosity and viscometric fixed points — Part 7: Determination of annealing point and strain point by beam bending
(Verre — Viscosité et points viscosimétriques fixes — Partie 7: Détermination de la température de recuit et de la température de contrainte par flexion de barreau)

Available languages: English

Available design: electronic design (pdf), Print design

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Detail information

Designation: ISO 7884-7:1987

Publication date: 26/11/1987

Pages: 9

Country: International technical standard

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Anotation

Description / Abstract: The specified method provides values being useful for specifying the cooling programme in the production of glassware. The annealing point is determined by measuring the rate of midpoint viscous bending of a simple loaded glass beam. The strain point is subsequently determined by an extrapolation method. Annex A provides the formulae for cross-sectional moment of inertia at various cross-section geometries, and annex B shows an example of beam bending apparatus

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