Ceramic and glass-insulating materials - Part 3: Specifications for individual materials

Applicable to ceramic, glass-ceramic, glass-mica and glass materials for electrical insulating purposes giving a classification of materials and typical numerical values for the major characteristics.

Keramik- und Glas-Isolierstoffe - Teil 3: Bestimmungen für einzelne Werkstoffe

Matériaux isolants à base de céramique ou de verre - Partie 3: Spécifications pour matériaux particuliers

S'applique aux matériaux en céramique, verre-céramique, verre-mica et en verre utilisés pour l'isolation électrique fournissant des indications pour classer des matériaux et les valeurs numériques typiques concernant les caractéristiques principales.

Ceramic and glass-insulating materials - Part 3: Specifications for individual materials (IEC 60672-3:1997)

General Information

Status
Published
Publication Date
16-Nov-1997
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Due Date
17-Nov-1997
Completion Date
17-Nov-1997

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SLOVENSKI STANDARD
SIST EN 60672-3:1998
01-junij-1998
Ceramic and glass-insulating materials - Part 3: Specifications for individual
materials (IEC 60672-3:1997)

Ceramic and glass-insulating materials -- Part 3: Specifications for individual materials

Keramik- und Glas-Isolierstoffe -- Teil 3: Bestimmungen für einzelne Werkstoffe

Matériaux isolants à base de céramique ou de verre -- Partie 3: Spécifications pour

matériaux particuliers
Ta slovenski standard je istoveten z: EN 60672-3:1997
ICS:
29.035.30 .HUDPLþQLLQVWHNOHQL Ceramic and glass insulating
L]RODFLMVNLPDWHULDOL materials
SIST EN 60672-3:1998 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60672-3:1998
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SIST EN 60672-3:1998
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SIST EN 60672-3:1998
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SIST EN 60672-3:1998
CEI
NORME
IEC
INTERNATIONALE
60672-3
INTERNATIONAL
Deuxième édition
STANDARD Second edition
1997-10
Matériaux isolants à base de céramique
ou de verre –
Partie 3:
Spécifications pour matériaux particuliers
Ceramic and glass-insulating materials –
Part 3:
Specifications for individual materials
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in

utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,

procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in

copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.

International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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SIST EN 60672-3:1998
60672-3 © IEC:1997 – 3 –
CONTENTS
Page

FOREWORD ........................................................................................................................5

INTRODUCTION .................................................................................................................. 7

Clause

1 Scope .............................................................................................................................. 9

2 Classification, guide to properties, minimum specifications............................................... 9

Tables

1 Ceramic-insulating materials ............................................................................................ 11

2 Glass-ceramic and glass-mica materials .......................................................................... 23

3 Glass-insulating materials ................................................................................................ 25

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SIST EN 60672-3:1998
60672-3 © IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
CERAMIC AND GLASS-INSULATING MATERIALS –
Part 3: Specifications for individual materials
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 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 60672-3 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 1984 and constitutes a

technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
15C/793/FDIS 15C/841/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.
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SIST EN 60672-3:1998
60672-3 © IEC:1997 – 7 –
INTRODUCTION

This part of IEC 60672 is one of a series which deals with ceramic, glass, glass-ceramic and

glass-mica materials for electrical insulating purposes. The series consists of three parts:

– Part 1: Definitions and classification (IEC 60672-1);
– Part 2: Methods of test (IEC 60672-2);
– Part 3: Specifications for individual materials (IEC 60672-3).

As outlined in the foreword to IEC 60672-1, the intention has been to remove redundant class

C830, and to include a range of new materials currently used commercially for electrical

insulation. A full list appears in IEC 60672-1.

This part of IEC 60672 describes the typical properties of electrically insulating ceramics for

use as satisfactory insulating components. Certain items are indicated with maximum or

minimum values. These items may be used as a property specification that may be applied to

test pieces. In using this standard as a minimum specification, the user should appreciate that

because test pieces and final components may not have equivalent properties as a result of

fabrication and geometrical factors, the specification of the final product should be based on

actual requirements, and not on this materials specification alone.
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SIST EN 60672-3:1998
60672-3 © IEC:1997 – 9 –
CERAMICS AND GLASS-INSULATING MATERIALS –
Part 3: Specifications for individual materials
1 Scope

This part of IEC 60672 is applicable to ceramic, glass-ceramic, glass-mica and glass materials

for electrical insulating purposes. It provides, for guidance, a classification of materials for

general electrical insulating purposes, and indicates typical numerical values for the

characteristics relevant to each subgroup or type of material as determined by the test methods

defined in IEC 60672-2. These numerical values apply only to the specified test specimens and

test methods. They cannot necessarily be extended to test specimens and products of other

shapes and dimensions or methods of fabrication.
2 Classification, guide to properties, minimum specifications

Classification into individual subgroups (types) of materials and typical numerical values of

properties are given in table 1 for ceramic insulating materials, in table 2 for glass-ceramic and

glass-mica insulating materials and in table 3 for glass-insulating materials.

Where a figure given in the tables is underlined in bold, it is considered that this property is

usually of importance for the applications for which the subgroup is normally employed, and

forms the basis of a minimum materials specification.

Certain characteristics are annotated with "maximum" or "minimum". These are characteristics

which are usually of most importance in defining acceptability in the selection of a suitable

insulating material. It is recommended that these characteristics are critically evaluated.

Materials which conform to this specification meet established levels of performance as

assessed on test specimens for properties appropriate to the application of the material.

However, the selection of a material by a user for a specific application should be based on the

actual requirements necessary for adequate performance in that application, and not on this

specification alone.
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SIST EN 60672-3:1998
60672-3 © IEC:1997 – 11 –
Table 1 – Ceramic-insulating materials
Table 1a
(for figures underlined in bold, see clause 2)
Group C 100
Type Alkaline alumino-silicate porcelains
3 Subgroup C 110 C 111 C 112 C 120 C 130 C 140
Name Siliceous Siliceous Cristobalite Aluminous Aluminous Lithia
porcelains porcelains, porcelains, porcelains porcelains, porcelains
plastic- pressed plastic- high strength
processed processed
Properties Symbol Units
5 Open (apparent) porosity, p Vol % 0,0 3 0,0 0,0 0,0 0,5
maximum
6 Bulk density, minimum
ρ Mg m 2,2 2,2 2,3 2,3 2,5 2,0
7 Flexural strength, Unglazed MPa 50 40 80 90 140 50
minimum
8 Glazed MPa 60 – 100 110 160 60
9 Modulus of elasticity, minimum E GPa 60 – 70 – 100 –
o o
–6 –1
10 α 10 K 3 to 6 3 to 5 6 to 8 3 to 6 4 to 7 1 to 3
Mean coefficient (30 C to 100 C)
30–100
of linear thermal
o o
–6 –1
11 10 K 3 to 6 3 to 6 6 to 8 3 to 6 4 to 7 1 to 3
expansion α (30 C to 300 C)
30–300
o o
–6 –1
12 10 K 4 to 7 4 to 7 6 to 8 4 to 7 5 to 7 1 to 3
α (30 C to 600 C)
30–600
o o
–6 –1
13 –– –– – –
α (30 C to 1 000 C) 10 K
30–1 000
–1 –1

14 Specific heat capacity J kg K 750 to 900 800 to 900 800 to 900 750 to 900 800 to 900 750 to

p,30–100
o o
30 C to 100 C 900
–1 –1

15 Thermal conductivity 1 to 2,5 1 to 2,5 1,4 to 2,5 1,2 to 2,6 1,5 to 4,0 1,0 to 2,5

λ W m K
30–100
o o
30 C to 100 C
16 Resistance to thermal shock, K 150 150 150 150 150 250
minimum
17 Electric strength, minimum* E kV mm 20 –20 20 20 15
18 Withstand voltage, minimum U kV 30 – 30 30 30 20
19 Relative permittivity – 6 to 7 – 5 to 6 6 to 7 6 to 7,5 5 to 7
48 Hz to 62 Hz
–6 –1
20 Temperature coefficient of TK 10 K +600 to – +600 to +600 to +500 +600 to –
permittivity +500 +500 +500
21 Dissipation factor 48 Hz to 62 Hz 25 –25 25 30 10
tan δ 10
at 20 °C,
maximum
22 1 kHz δ 10 –– –– – –
tan
23 1 MHz 10 12 – 12 12 15 10
tan δ
o 11 10 11 11 11 11
Volume resistivity
24 30 C 10 10 10 10 10 10
ρ Ω m
v,30
in terms of
6 6 6 6 6 7
temperature (d.c.),
25 200 C
ρ Ω m 10 10 10 10 10 10
v,200
minimum
2 2 2 2 2 2
26 600 C ρ Ω 10 10 10 10 10 10
v,600
Minimum
27 T C 200 200 200 200 200 200
1 MΩ m
temperature
corresponding to a T
28 Ω C 350 350 350 350 350 350
0,01 M m
ρ0,01
volume resistivity of

* Given values refer to tests on specimens according to figure 6 of IEC 60672-2.

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SIST EN 60672-3:19
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