EN 60455-3-3:2003

Resin based reactive compounds used for electrical insulation - Part 3: Specifications for individual materials - Sheet 3: Unfilled polyurethane compounds

Gives the requirements for unfilled polyurethane resinous compounds in the cured form for classes PUR-U-4 to PUR-U-8 with an ash content of not more than 6 %.

Reaktionsharzmassen für die Elektroisolierung - Teil 3: Anforderungen an einzelne Werkstoffe - Blatt 3: Ungefüllte Polyurethanharzmassen

Composés réactifs à base de résines utilisés comme isolants électriques - Partie 3: Spécifications pour matériaux particuliers - Feuille 3: Composés résineux de polyuréthanne non chargés

Contient les exigences pour les composés résineux de polyuréthanne non chargés à l'état durci ou polymérisé, destinés aux catégories PUR-U-4 à PUR-U-8, dont la teneur en cendres n'est pas supérieure à 6 %.

Reaktivne zmesi na osnovi smole, ki se uporabljajo za električno izolacijo - 3. del: Specifikacije za posamezne materiale - 3. list: Nepolnjene poliuretanske zmesi (IEC 60455-3-3:2003)

General Information

• Status: Published
• Publication Date: 06-Jul-2003
• Withdrawal Date: 31-May-2006
• ICS: 29.035.01 - Insulating materials in general
• Technical Committee: CLC/SR 15 - Insulating materials
• Drafting Committee: IEC/TC 15 - IEC_TC_15
• Parallel Committee: IEC/SC 15C - IEC_SC_15C
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 07-Jul-2003
• Completion Date: 07-Jul-2003
• Ref Project: SIST EN 60455-3-3:2004 - Resin based reactive compounds used for electrical insulation -- Part 3: Specifications for individual materials -- Sheet 3: Unfilled polyurethane compounds

Relations

• Replaces: HD 307.3.3 S1:1986 - Specification for solventless polymerisable resinous compounds used for electrical insulation - Part 3: Specifications for individual materials - Sheet 3: Unfilled polyurethane compounds
• Effective Date: 29-Jan-2023

Overview

EN 60455-3-3:2003 (sheet 3) is the CLC/CENELEC adoption of IEC 60455-3-3 and specifies requirements for unfilled polyurethane resinous compounds used for electrical insulation. The standard covers cured materials for classes PUR‑U‑4 to PUR‑U‑8 and limits ash content to not more than 6%. It complements the series on resin based reactive compounds by referencing test methods in EN/IEC 60455‑2.

Key topics and technical requirements

This specification defines both uncured and cured material requirements and refers to EN/IEC 60455‑2 for test methods.

• Uncured form (tests referenced):
  • Density, viscosity, shelf life, gel time, exothermic temperature peak
• Cured form (class-dependent requirements; typical properties listed):
  • Density ranges (e.g., PUR‑U‑4: 1.10–1.25 g/cm3; PUR‑U‑5: 1.00–1.20 g/cm3)
  • Mechanical properties: flexural strength, tensile strength, elongation at break, impact strength
  • Hardness (Shore scales), and compressive yield stress
  • Thermal properties: glass transition temperature (Tg), temperature of deflection under load, thermal endurance (flexural strength retention)
  • Electrical properties: volume resistivity, dielectric permittivity, dissipation factor, electric strength (kV/mm), electrolytic corrosion classification, tracking resistance
  • Environmental resistance: water absorption, hydrolytic stability, ash content (≤ 6 %)
• Requirements vary by material class (PUR‑U‑4 through PUR‑U‑8); some tests/limits are “not applicable” for specific classes.

Applications and users

EN 60455-3-3 is practical for:

• Polyurethane compound manufacturers developing or certifying unfilled resin systems for electrical insulation
• Transformer, coil, motor and potting compound formulators assessing material suitability for insulation, impregnation and potting
• Design engineers and specifiers who select insulation materials based on mechanical, thermal and dielectric performance
• Test laboratories and quality assurance teams performing EN/IEC 60455‑2 test methods to verify compliance
• Procurement and compliance officers referencing standardized material classes (PUR‑U‑4 to PUR‑U‑8) in contracts and technical specifications

Typical applications include insulation for windings, potting and encapsulation, and protective coatings in electrical and electronic equipment where polyurethane chemistry is selected for its mechanical and dielectric balance.

Related standards

• EN/IEC 60455‑1 - Definitions and general requirements for resin based reactive compounds
• EN/IEC 60455‑2 - Methods of test (normative reference for EN 60455‑3‑3)

Keywords: EN 60455-3-3, unfilled polyurethane compounds, resin based reactive compounds, electrical insulation, PUR-U-4, dielectric properties, mechanical properties, EN 60455-2.

Standards Content (Sample)

STANDARDReaktivne zmesi na osnovi smole, ki se uporabljajo za električno izolacijo - 3. del: Specifikacije za posamezne materiale - 3. list: Nepolnjene poliuretanske zmesi (IEC 60455-3-3:2003)Resin based reactive compounds used for electrical insulation - Part 3: Specifications for individual materials - Sheet 3: Unfilled polyurethane compounds (IEC 60455-3-3:2003)©
Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 60455-3-3:2004(en)ICS29.035.20

EUROPEAN STANDARD
EN 60455-3-3 NORME EUROPÉENNE EUROPÄISCHE NORM
July 2003 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60455-3-3:2003 E
ICS 29.035.01 Supersedes HD 307.3.3 S1:1986
English version
Resin based reactive compounds used for electrical insulation Part 3: Specifications for individual materials Sheet 3: Unfilled polyurethane compounds (IEC 60455-3-3:2003)
Composés réactifs à base de résines utilisés comme isolants électriques Partie 3: Spécifications pour matériaux particuliers Feuille 3: Composés résineux
de polyuréthanne non chargés (CEI 60455-3-3:2003)
Reaktionsharzmassen für die Elektroisolierung Teil 3: Anforderungen an einzelne Werkstoffe Blatt 3: Ungefüllte Polyurethanharzmassen (IEC 60455-3-3:2003)
This European Standard was approved by CENELEC on 2003-06-01. 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 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 to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

The text of document 15C/1463/FDIS, future edition 2 of IEC 60455-3-3, prepared by SC 15C, Specifications, of IEC TC 15, Insulating materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60455-3-3 on 2003-06-01.
This European Standard replaces HD 307.3.3 S1:1986.
References to HD 307.2 S1:1986 have been updated to EN 60455-2:1999. No significant technical changes have been made.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop) 2004-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow) 2006-06-01
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. __________
Endorsement notice
The text of the International Standard IEC 60455-3-3:2003 was approved by CENELEC as a European Standard without any modification. __________

- 3 - EN 60455-3-3:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60455-2 1998 Resin based reactive compounds used for electrical insulation Part 2: Methods of test
EN 60455-2 1999
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD60455-3-3Deuxième éditionSecond edition2003-04Composés réactifs à base de résinesutilisés comme isolants électriques –Partie 3:Spécifications pour matériaux particuliers –Feuille 3:Composés résineux de polyuréthannenon chargésResin based reactive compoundsused for electrical insulation –Part 3:Specifications for individual materials –Sheet 3:Unfilled polyurethane compoundsPour prix, voir catalogue en vigueurFor price, see current catalogue IEC 2003
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Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized in anyform or by any means, electronic or mechanical, includingphotocopying and microfilm, without permission in writing fromthe publisher.International Electrotechnical Commission,
3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: [phone]
Telefax: [phone]
E-mail: [e-mail]
Web: www.iec.chCODE PRIXPRICE CODEECommission Electrotechnique InternationaleInternational Electrotechnical Commission

60455-3-3  IEC:2003– 3 –INTERNATIONAL ELECTROTECHNICAL COMMISSION___________RESIN BASED REACTIVE COMPOUNDS USEDFOR ELECTRICAL INSULATION –Part 3: Specifications for individual materials –Sheet 3: Unfilled polyurethane compoundsFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object
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