IEC 60455-1:1998 pdf download.Resin based reactive compounds used for electrical insulation – Part 1: Definitions and general requirements
1 Scope
This part of IEC 60455 relates to resin based reactive compounds and their components used for electrical insulation. All reactive compounds are solvent-free and may contain reactive diluents and fillers. The reactions involved in curing are polymerization and/or crosslinking. This standard does not relate to reactive compounds used as coating powders. NOTE – It is intended to draw up specifications for coating powders as a separate IEC Standard having a different number. These materials may be used for a range of applications, of which common ones are shown in table 1 .
2 Designation
Depending on their composition and reactivity, these compounds cure at ambient or at elevated temperature. The curing reaction may lead to rigid, flexible or elastomeric materials. The designation of a particular compound is based on the composition of its resin content or of its major reactive portion. The commonly used resins are as shown in table 2. For symbols of resins and polymers and their special characteristics see ISO 1 043-1 .
3 Normative references
The following normative documents contain provisions which, through reference in this text,
constitutes provisions of this part of IEC 60455. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this part of IEC 60455 are encouraged to investigate the possibility of
applying the most recent edition of the normative documents indicated below 1 ) . Members of
IEC and ISO maintain registers of currently valid international standards.
IEC 60050(21 2):1 990, International Electrotechnical Vocabulary (IEV) – Chapter 21 2: Insulating
solids, liquids and gases
IEC 60445-2:1 977, Specification for solventless polymerisable resinous compounds used for
electrical insulation – Part 2: Methods of test
ISO 472:1988, Plastics – Vocabulary
ISO 1 043-1:1 987, Plastics – Symbols – Part 1 : Basic polymers and their special characteristics
ISO 1 043-2:1 988, Plastics – Symbols – Part 2: Fillers and reinforcing materials
ISO 4597-1:1 983 , Plastics – Hardeners and accelerators for epoxide resins – Part 1 :
Designation
4 Definitions
NOTE – If available, definitions are taken from IEC 60050(21 2) or ISO 472. Where a more specific definition is
required, its wording is as close as possible to that given in IEC 60050(21 2) or ISO 472.
4.1 reactive compound
intimate admixture of a casting resin with other reactive components such as hardener,
accelerator, inhibitor or reactive diluent, and with or without filler and certain additives, whereby
virtually no volatile matter is released during the subsequent curing reaction. Reactive
compounds are solvent-free
NOTE – Small quantities of by-products may be evolved during cure of selected resins. In the case where the resinous part of the reactive compound is diluted by means of a reactive diluent, small quantities of monomeric
diluent may evaporate during cure mainly due to the application conditions used.
4.2 cured compound
the reactive compound after it is cured. The cured compound is self-supporting
4.3 reactive component
any part of the reactive compound, for example resin, initiator, hardener, accelerator, inhibitor
and reactive diluent, that reacts with other components or by chain reaction
4.4 resin
a solid, semi-solid, or pseudo-solid organic material that has an indefinite and often high
relative molecular mass, exhibits a tendency to flow when subjected to stress, usually has a
softening or melting range, and usually fractures conchoidally. In a broad sense, the term is
used to designate any polymer that is a basic material for plastics
IEC 60455-1:1998 pdf download
