Viscosity and viscometric fixed points of glass Method for the determination of (dilatometric) transformation temperature

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-01-1989

Publisher

British Standards Institution

National foreword
Committees responsible
Method
0 Introduction
1 Scope
2 Field of application
3 Reference
4 Definition
5 Principle
6 Apparatus
7 Test specimen
8 Procedure
9 Expression of results
10 Test report
Figures
1 Example of a dilatometer curve and the evaluation of
    transformation temperature (521 deg C in this case)
    of a glass
2 Example of the dilatometer curve of a glass in the
    annealed and in a quenched state

Thermal expansion method.

This part of ISO 7884 specifies a method of determining the (dilatometric) transformation temperature t_g of a glass by means of the thermal expansion method. This temperature characterizes a certain glass transition range from the elastic brittle (low temperature) state to the viscous (high temperature) state of glass. The transformation temperature has been found useful for specifying cooling programmes and estimating the upper temperature limit of applicability of the respective glassware.

NOTE The more direct viscometric method of annealing point and strain point determination (see ISO 7884-7) serves similar purposes. The determination of the transformation temperature t_g might be convenient if a suitable device for determining the coefficient of thermal expansion is available in the laboratory.

Committee	LBI/1/2
DevelopmentNote	Supersedes 86/51631 DC. Also numbered as ISO 7884-8. (09/2005)
DocumentType	Standard
Pages	12
PublisherName	British Standards Institution
Status	Current

BS 7030:1988	Method for determination of the coefficient of mean linear thermal expansion of glass
BS EN 1595:1997	Pressure equipment made from borosilicate glass 3.3. General rules for design, manufacture and testing

BS 4937-4:1973	International thermocouple reference tables Nickel -chromium/nickel - aluminium thermocouples. Type K
BS 4937-6:1974	International thermocouple reference tables Nickel-chromium/copper-nickel thermocouples. Type E
BS 7034-7:1988	Viscosity and viscometric fixed points of glass Method for the determination of annealing point and strain point by beam bending
BS 4937-3:1973	International thermocouple reference tables Iron/copper - nickel thermocouples. Type J
BS 7030:1988	Method for determination of the coefficient of mean linear thermal expansion of glass

View more information

$247.06

Including GST where applicable

Product format

I agree to the DRM document license rules apply against the PDF selection made.

Please confirm that you agree to the document license rules for this document.

I agree to the document license rules .

Please confirm that you agree to the document license rules for this document.

Access your standards online with a subscription

Features

Simple online access to standards, technical information and regulations.
Critical updates of standards and customisable alerts and notifications.
Multi-user online standards collection: secure, flexible and cost effective.

Learn more on subscription solutions

Get in touch with us

BS 7034-8:1988

Viscosity and viscometric fixed points of glass Method for the determination of (dilatometric) transformation temperature

Table of Contents

Abstract

Scope

General Product Information

Standards Referenced By This Book

Standards Referencing This Book

Category

Subcategory