EN 60672-2:2000

SLOVENSKI STANDARD
01-marec-2001
1DGRPHãþD
SIST HD 426.2 S1:1998
Ceramic and glass insulating materials - Part 2: Methods of test (IEC 60672-2:1999)
Ceramic and glass insulating materials -- Part 2: Methods of test
Keramik- und Glasisolierstoffe -- Teil 2: Prüfverfahren
Matériaux isolants à base de céramique ou de verre -- Partie 2: Méthodes d'essai
Ta slovenski standard je istoveten z: EN 60672-2:2000
ICS:
29.035.30 .HUDPLþQLLQVWHNOHQL Ceramic and glass insulating
L]RODFLMVNLPDWHULDOL materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL IEC
STANDARD 60672-2
Second edition
1999-12
Ceramic and glass insulating materials –
Part 2:
Methods of test
 IEC 1999 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
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60672-2 © IEC:1999 – 3 –
CONTENTS
Page
FOREWORD . 7
Clause
1 Scope . 11
2 Normative references. 11
3 General notes on tests. 13
4 Dye penetration test (liquid absorption). 17
5 Bulk density and open (apparent) porosity . 19
6 Flexural strength. 25
7 Modulus of elasticity . 33
8 Mean coefficient of linear thermal expansion. 41
9 Specific heat capacity . 45
10 Thermal conductivity . 47
11 Resistance to thermal shock . 49
12 Glass transition temperature (for glass materials only). 53
13 Electric strength.55
14 Withstand voltage . 61
15 Relative permittivity, temperature coefficient of permittivity and dissipation factor . 63
16 Volume resistivity. 67
Annex A (normative) Standard temperature conditions for testing. 85
Bibliography . 87
Figure 1 – Apparatus for applying high pressure to dye solution contained
in a metal container. 71
Figure 2 – Function of mechanical testing jigs and symbols for strength tests . 73
Figure 3 – Shape, symbols and dimensions of flexural strength test pieces . 75
Figure 4 – Deflection parameters and method of determination of deflections
for Young's modulus determination. 77
Figure 5 – Graphical construction for determination of transition temperature T of glasses . 79
g
Figure 6 – Test piece for electrical strength and withstand voltage tests, method B. 81
Figure 7 – Electrode arrangement for electric strength measurement, method A . 83

60672-2 © IEC:1999 – 5 –
Page
Table 1 – Characteristics and minimum number of test pieces for each test . 15
Table 2 – Density of distilled water. 23
Table 3 – Dimensions of test pieces and flexural strength test jig
for various groups of ceramic materials . 29
Table 4 – Dimensions of test pieces for method B (see also figure 6) . 57
Table 5 – Values of k for various values of thickness of test pieces. 59
Table A.1 – Standard temperature conditions for testing . 85

60672-2 © IEC:1999 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
–––––––––––––
CERAMIC AND GLASS INSULATING MATERIALS –
Part 2: Methods of test
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60672-2 has been prepared by subcommittee 15C: Specifications,
of IEC technical committee 15: Insulating materials.
This second edition cancels and replaces the first edition published in 1980 and constitutes a
technical revision. In redrafting this standard, the intention has been to improve the
instructions in the test methods so that the document becomes more usable in the testing
laboratory. Some of the ambiguities of test conditions have been removed, particularly for
mechanical testing for which the recent development of improved understanding of significant
factors in testing has allowed a better definition of requirements and a restriction of the range
of previously optional test piece sizes.
The text of this standard is based on the following documents:
FDIS Report on voting
15C/1049/FDIS 15C/1069/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.

60672-2 © IEC:1999 – 9 –
IEC 60672 consists of the following parts under the general title Ceramic and glass insulating
materials:
Part 1:1995, Definitions and classification;
Part 2:1999, Methods of test;
Part 3:1997, Specifications for individual materials.
Annex A forms an integral part of this standard.
The committee has decided that this publication remains valid until 2008. At this date, in
accordance with the committee’s decision, the publication will be
reconfirmed;
withdrawn;
replaced by a revised edition, or
amended.
60672-2 © IEC:1999 – 11 –
CERAMIC AND GLASS INSULATING MATERIALS –
Part 2: Methods of test
1 Scope
This part of IEC 60672 is applicable to ceramic, glass and glass-ceramic materials to be used
for electrical insulation purposes. This standard specifies methods of test. It is intended to
provide test results typical of the material from which the test pieces are processed. Since, in
the majority of cases, ceramic components for insulating purposes are of rather different size
and shape to test pieces, the results of such tests provide only a guide to the actual
properties of components. The limitations imposed by the method of forming and processing
are discussed where relevant.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60672. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of IEC 60672 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO
and IEC maintain registers of currently valid International Standards.
IEC 60093:1980, Methods of test for volume resistivity and surface resistivity of solid
electrical insulating materials
IEC 60212:1971, Standard conditions for use prior to and during the testing of solid electrical
insulating materials
IEC 60243-1:1998, Electric strength of insulating materials – Test methods – Part 1: Tests at
power frequencies
IEC 60250:1969, Recommended methods for the determination of the permittivity and
dielectric dissipation factor of electrical insulating materials at power, audio and radio
frequencies, including metre wavelengths
IEC 60345:1971, Method of test for electrical resistance and resistivity of insulating materials
at elevated temperatures
IEC 60672-1:1995, Ceramic and glass insulating materials – Part 1: Definitions and
classification
IEC 60672-3:1997, Ceramic and glass insulating materials – Part 3: Specifications for
individual materials
IEC 61006:1991, Methods of test for the determination of the glass transition temperature of
electrical insulating materials

60672-2 © IEC:1999 – 13 –
ISO/DIS 463, Geometrical product specifications (GPS) – Dimensional measuring instruments –
1)
Dial gauges – Design and metrological requirements (Revision of ISO/R 463:1965)
ISO 758:1976, Liquid chemical products for industrial use – Determination of density at 20 °C
ISO 3534-1:1993, Statistics – Vocabulary and symbols – Part 1: Probability and general
statistical terms
ISO 3611:1978, Micrometer callipers for external measurement
ISO 6906:1984, Vernier callipers reading to 0,02 mm
ISO 7884-8:1987, Glass – Viscosity and viscometric fixed points – Part 8: Determination of
(dilatometric) transformation temperature
3 General notes on tests
3.1 Test pieces
Test pieces shall be processed under conditions closely similar to those normally employed
for the manufacture of components, and in sufficient numbers to be representative of those
conditions. It is emphasized that results from the test pieces are affected by the method of
forming and, in many cases, by the method of surface finishing; methods used should, as far
as possible, be those used in the production of items. For each test result reported, the
method of manufacture of the test piece shall be specified. All numerical values determined
according to these test methods apply only to the test pieces prescribed. They cannot be
extended to test pieces and ceramic products of other shapes and dimensions nor of other
types of manufacture. The minimum number of test pieces for each test is given in table 1.
NOTE For thermally toughened glass test pieces, the thermally pre-stressed state of glass depends on the
following factors:
– thermal expansion below and above the transition range (see IEC 61006);
– viscosity/temperature relation;
– thermal diffusivity, i.e. thermal conductivity (specific heat capacity × bulk density);
– elastic properties;
– starting temperature of cooling;
– heat transfer coefficient;
– thickness and form of glass product.
As a result of the last factor, test pieces from the same glass but of different shape and thickness have different
tempering levels, although they are tempered under the same conditions. Consequently, it is impossible to have a
special test piece which represents the properties of toughened glass i
...