ISO 7884-6:1987
(Main)Glass — Viscosity and viscometric fixed points — Part 6: Determination of softening point
Glass — Viscosity and viscometric fixed points — Part 6: Determination of softening point
The temperatur above which the glass is capable of most forming operations is determined by measuring the elongation of a round glass fibre under its own weight. Closely defines requirements for the test specimen, procedure and apparatus lead to optimum repeatability of the specified temperature point. The furnace is specified with essential aspects.
Verre — Viscosité et points viscosimétriques fixes — Partie 6: Détermination de la température de ramollissement
General Information
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The principle of the method specified is complexing of the aluminium in the extract solution to be analyzed with chromazurol S, measuring the optical density of the resulting solution by means of a molecular absorption spectrometer at 545 nm using 10 mm optical cells. Measures the concentration of aluminium, expressed as its oxide Al2O3. Applies to the analysis of extract solutions obtained from any kind of glass or glassware including laboratory and pharmaceutical ware, food and drink packaging ware, tableware and kitchenware.
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