1、BRITISH STANDARD BS EN 60672-1:1996 IEC672-1: 1995 Ceramic and glass insulating materials Part1: Definitions and classification The European Standard EN60672-1:1995 has the status of a BritishStandard ICS 01.040.29; 29.040.20BSEN60672-1:1996 This BritishStandard, having been prepared under the direc
2、tionof the ElectrotechnicalSector Board, was published underthe authorityof the Standards Boardand comesinto effect on 15February1996 BSI12-1999 The following BSI references relate to the work on this standard: Committee referenceGEL/15 Draft for comment94/216808DC ISBN 0 580 25133 0 Committees resp
3、onsible for this British Standard The preparation of this BritishStandard was entrusted to Technical Committee GEL/15, Insulating materials, upon which the following bodies were represented: British Ceramic Research Ltd. British Industrial Ceramic Manufacturers Association British Telecommunications
4、 plc Department of Trade and Industry (National Physical Laboratory) Electrical and Electronic Insulation Association (BEAMA Ltd.) Electricity Association Federation of the Electronics Industry Ministry of Defence Rotating Electrical Machines Association (BEAMA Ltd.) Transmission and Distribution As
5、sociation (BEAMA Ltd.) The following body was also represented in the drafting of the standard, through subcommittees and panels: ERA Technology Ltd. Amendments issued since publication Amd. No. Date CommentsBSEN60672-1:1996 BSI 12-1999 i Contents Page Committees responsible Inside front cover Natio
6、nal foreword ii Foreword 2 Text of EN60672-1 3 List of references Inside back coverBSEN60672-1:1996 ii BSI 12-1999 National foreword This Part of BS EN60672 has been prepared by Technical CommitteeGEL/15 and is the English language version of EN60672-1:1995 Ceramic and glass insulating materials Par
7、t1: Definitions and classification published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC672-1:1995 published by the International Electrotechnical Commission (IEC). This BritishStandard supersedes BS6045-1:1981, which is withdrawn. The1995 editi
8、on of IEC672-1 cancels and replaces the first edition IEC672-1(1980) and constitutes a technical revision. The intention has been to improve the instruction to the user by defining more clearly the types of material that fall into the individual classes of the classification as an aid to their effec
9、tive selection and use. The class of ceramic insulating materials that has been deleted from the first edition is ClassC830, zirconia ceramics, for the reason that there are no known applications where zirconia, with its inferior properties to those of alumina, would be used as an insulator. Additio
10、nal classes of ceramic and glass materials which are in common use for electrical insulation but which were excluded from the previous edition have been incorporated specifically: There has been some rationalization of the class numbering for borosilicate glasses: the formerG200 andG300 groups have
11、been combined underG200; the former groupG200, chemically resistant borosilicate glass, has been renumberedG220; the former subgroupG310, low loss electrically resistant glass, has been renumberedG231; the former subgroupG320, high voltage electrically resistant glass, has been renumberedG232. C140
12、Lithia porcelains C430 Lime-based porcelains C440 Zircon porcelains C910 Aluminium nitrides C920 Boron nitrides C930 Reaction bonded silicon nitride C935 Dense silicon nitrides GC110 Glass-ceramics, bulk type GC120 Glass-ceramics, sintered type GM110 Glass-bonded mica, natural mica and glass frit GM
13、120 Glass-bonded mica, glass-ceramic type G795 High silica glass,95% to99%SiO 2 G799 High-silica glass, 99%SiO 2 Cross-reference Publication referred to Corresponding BritishStandard EN61006:1993 (IEC1006:1991) BS EN61006:1993 Methods of test for determination of the glass transition temperature of
14、electrical insulating materialsBSEN60672-1:1996 BSI 12-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity f
15、rom legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, theENtitle page, pages2 to14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicate
16、d in the amendment table on the inside front cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60672-1 July1995 ICS 01.040.29; 29.040.20 SupersedesHD426.1S1:1983 Descriptors: Ceramic and glass insulants, classification, properties, definitions English version Ceramic and glass insula
17、ting materials Part1: Definitions and classification (IEC672-1:1995) Matriaux isolants base de cramique ou de verre Partie1: Dfinitions et classification (CEI672-1:1995) Keramik- und Glas-Isolierstoffe Teil1: Begriffe und Gruppeneinteilung (IEC672-1:1995) This European Standard was approved by CENEL
18、EC on1995-07-04. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards
19、 may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified
20、 to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Un
21、itedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. EN60672-1:1995EEN
22、60672-1:1995 BSI 12-1999 2 Foreword The text of document15C/469/DIS, future edition2 of IEC672-1, prepared by SC15C, Specifications, of IECTC15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN60672-1 on1995-07-04. This European Standard supersed
23、es HD426.1S1:1983. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Classification of ceramic
24、s, glasses, glass-ceramics and glass-bonded mica materials 4 Annex ZA (normative) Normative references to international publications with their corresponding European publications 13 Table 1 Ceramic insulating materials 5 Table 2 Glass-ceramic insulating materials 11 Table 3 Glass-bonded mica insula
25、ting materials 11 Table 4 Glass insulating materials 12 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)1996-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow
26、)1996-04-01EN60672-1:1995 BSI 12-1999 3 1 Scope This part of IEC672 is applicable to ceramic, glass-ceramic, glass-mica and glass materials for electrical insulating purposes. This part of IEC672 gives definitions of terms used, and provides tables classifying the various material types into groups
27、according to compositional type, property attributes and applications. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC672. At the time of publication, the editions indicated were valid. All n
28、ormative documents are subject to revision, and parties to agreement based on this part of IEC672 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid normative docu
29、ments. IEC1006:1991, Methods of test for the determination of the glass-transition temperature of electrical insulating materials. 3 Definitions For the purposes of this part of IEC672, the following definitions apply. 3.1 insulating material a solid with negligibly low electrical conductivity, used
30、 to separate conducting parts of different electrical potentials 3.2 ceramic insulating material an inorganic material shaped before firing, of which the principal constituents usually comprise polycrystalline silicates, aluminosilicates, and simple or complex oxide compounds, e.g.titanates. The def
31、inition also covers certain non-oxide materials such as aluminium nitride 3.3 glass insulating material an inorganic material, usually a mixture of oxides produced by melting and subsequent solidification essentially without crystallization 3.4 annealed glass glass cooled slowly from an elevated tem
32、perature so that residual stresses of thermal origin can be neglected in relation to applied stresses 3.5 toughened glass glass prepared by pre-stressing such that all body surfaces are in a state of compression, while the interior zone is in tension and is fully protected by the compressive skin 3.
33、6 glass-ceramic material an insulating material derived from bulk glass or glass powder which has been subjected to a heat treatment so as to induce a substantial amount of crystallinity on a fine scale to render the material a polycrystalline body 3.7 glass-bonded mica material an insulating materi
34、al which comprises natural or synthetic micas in fine particle size bonded with glassy material. Such materials may be produced by either directly bonding natural mica with a glass frit, or by crystallization of a suitably formulated glass-ceramic 3.8 glaze a substantially glassy, smooth coating bon
35、ded usually by fusion to a ceramic surface, obtained by melting an applied powder on to a ceramic surface. It may contain colouring and/or opacifying inorganic substances 3.9 porosity the presence in a body of void space, usually as discrete pores, which may be isolated or interconnected 3.10 bulk v
36、olume the total volume measured externally including all open and closed pores 3.11 bulk density ( a ) the quotient obtained by dividing the mass of the test specimen by the bulk volume including open and closed pores, expressed in megagrams per cubic metre (numerically equivalent to grams per cubic
37、 centimetre) 3.12 open (apparent) porosity (p a ) the ratio of the volume of open pores to the bulk volume, expressed as a percentageEN60672-1:1995 4 BSI 12-1999 3.13 dye porosity an indication of liquid absorption by means of dye penetration under pressure. This is often manifested as a general or
38、localized coloration of the surface. Cracks may appear as distinct lines of dye. A distinction should be drawn between surface absorption due to machining or other damage restricted to the immediate surface, and bulk absorption which is immediately apparent if the specimen is fractured 3.14 resistan
39、ce to thermal shock (%T) a term describing the ability of a material or a component to withstand rapid changes of temperature without loss of performance. This property is normally determined by methods involving transference of a heated specimen into a cold water bath. The maximum temperature chang
40、e in kelvins tolerated without fracture by a specimen of prescribed dimensions is termed the thermal shock resistance for the purposes of this standard 3.15 glass transition temperature (T g ) the transition of a glass from a rigid non-equilibrium state at low temperatures to a viscous liquid state
41、at high temperatures is observed as an inflection in the expansion/temperature curve of the glass when heated at a constant rate. The transition temperature is defined as the temperature corresponding to the intersection of two tangents drawn from the lower temperature branch and the high-temperatur
42、e branch of the dilatometer curve when the test-piece is heated at5K per minute (IEC1006) NOTEAt the glass transition temperature internal stresses are substantially removed within a few minutes, and the dynamic viscosity is approximately10 12.3 Nsm 2 . 4 Classification of ceramics, glasses, glass-c
43、eramics and glass-bonded mica materials The classification of materials by this standard is based on compositional type and properties. There are nine groups of ceramics (designated with an initial letter “C”), seven groups of glasses (designated “G”), one group of glass-ceramics (designated “GC”),
44、and one group of glass-bonded mica materials (designated “GM”). The classes are intended to cover broad material type with properties suitable for the applications which have developed for them. In this respect, IEC672-3 acts as a guide to properties and a specification for materials of the various
45、classes. The classification scheme is described in Table 1 to Table 4. EN60672-1:1995 BSI 12-1999 5 Table 1 Ceramic insulating materials Group Sub-group Material type Composition Other characteristics Principal applications C100 Alkaline aluminosilicates C110 Siliceous porcelains, plastic processed
46、Quartz based, feldspar fluxed Impervious, may be used unglazed High-tension and low-tension insulators C111 Siliceous porcelains, pressed Quartz based, feldspar fluxed Some open porosity, usually requires glazing Low-tension insulators C112 Cristobalite porcelains, plastic processed Contains cristob
47、alite resulting from use of high-silica clays and/or calcined silica products Impervious, may be used unglazed High-tension and low-tension insulators C120 Aluminous porcelains Feldspar fluxed porcelains in which quartz is partially replaced by alumina Impervious, strength a 110MPa High-tension and
48、low-tension insulators C130 Aluminous porcelains Non-refractory, feldspar fluxed porcelains in which alumina is the principal filler Impervious, strength a 160MPa High-tension and low-tension insulators, small high-strength parts C140 Lithia porcelains Based on petalite, spodumene or eucryptite Low
49、expansion coefficient Insulators requiring high thermal shock resistance a on glazed test specimenEN60672-1:1995 6 BSI 12-1999 Table 1 Ceramic insulating materials Group Sub-group Material type Composition Other characteristics Principal applications C200 Magnesium silicates C210 Steatites, low voltage Based on protoenstatite Some open porosity, strength 80MPa High-frequency insulators, insulators for electric heating C220 Steatites, normal Based on protoenstatite Impervious, lowloss, strength 120MPa High-frequency insulators, insula
