SIST EN 60672-3:1998

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

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
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For price, see current catalogue

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

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.

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.

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.
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
a
maximum
–3
6 Bulk density, minimum
ρ Mg m 2,2 2,2 2,3 2,3 2,5 2,0
a
7 Flexural strength, Unglazed MPa 50 40 80 90 140 50
σ
ft
minimum
8 Glazed MPa 60 – 100 110 160 60
σ
fg
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
c
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
ΔT
minimum
–1
17 Electric strength, minimum* E kV mm 20 –20 20 20 15
d
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
ε
r
48 Hz to 62 Hz
–6 –1
20 Temperature coefficient of TK 10 K +600 to – +600 to +600 to +500 +600 to –
ε
permittivity +500 +500 +500
–3
21 Dissipation factor 48 Hz to 62 Hz 25 –25 25 30 10
tan δ 10
pf
at 20 °C,
–3
maximum
22 1 kHz δ 10 –– –– – –
tan
1k
–3
23 1 MHz 10 12 – 12 12 15 10
tan δ
1M
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
o
6 6 6 6 6 7
temperature (d.c.),
25 200 C
ρ Ω m 10 10 10 10 10 10
v,200
minimum
o
2 2 2 2 2 2
26 600 C ρ Ω 10 10 10 10 10 10
m
v,600
o
Minimum
27 T C 200 200 200 200 200 200
1 MΩ m
ρ1
temperature
o
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.

SIST EN 60672-3:19
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