EN ISO 11502:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Polimerni materiali - Filmi in folije - Ugotavljanje odpornosti proti zlepljenju (ISO 11502:1995)Kunststoffe - Folien und Bahnen - Bestimmung des Blockwiderstandes (ISO 11502:1995)Plastiques - Film et feuille - Détermination du pouvoir bloquant (ISO 11502:1995)Plastics - Film and sheeting - Determination of blocking resistance (ISO 11502:1995)83.140.10Filmi in folijeFilms and sheetsICS:Ta slovenski standard je istoveten z:EN ISO 11502:2005SIST EN ISO 11502:2005en01-oktober-2005SIST EN ISO 11502:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 11502July 2005ICS 83.140.10 English VersionPlastics - Film and sheeting - Determination of blockingresistance (ISO 11502:1995)Plastiques - Film et feuille - Détermination du pouvoirbloquant (ISO 11502:1995)Kunststoffe - Folien und Bahnen - Bestimmung desBlockwiderstandes (ISO 11502:1995)This European Standard was approved by CEN on 7 July 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 11502:2005: ESIST EN ISO 11502:2005

Foreword
The text of ISO 11502:1995 has been prepared by Technical Committee ISO/TC 61 "Plastics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 11502:2005 by Technical Committee CEN/TC 249 "Plastics", the secretariat of which is held by IBN.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2006, and conflicting national standards shall be withdrawn at the latest by January 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 11502:1995 has been approved by CEN as EN ISO 11502:2005 without any modifications.
INTERNATIONAL STANDARD ISO 11502 First edition 1995-09-15 Plastics - Film and sheeting - Determination of blocking resistance Plas tiques - Film et feuille - Determination du pouvoir bloquan t Reference number ISO 11502:1995(E) SIST EN ISO 11502:2005

ISO 11502:1995(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 11502 was prepared by Technical Committee lSO/TC 61, Plastics, Subcommittee SC 11, Products. 0 ISO 1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland SIST EN ISO 11502:2005

INTERNATIONAL STANDARD 0 ISO ISO 11502:1995(E) Plastics - Film and sheeting - Determination of blocking resistance 1 Scope This International Standard specifies two methods for assessing the tendency of flexible plastic films and sheets to adhere to one another when left in contact for some time, at a specified temperature and under light pressure. One method is qualitative and the other is quantitative. 2 Normative reference The following Standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the edition indicated was valid. All Standards are subject to revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent edition of the Standard indicated below. Mem- bers of IEC and ISO maintain registers of currently valid International Standards. ISO 291 :1977, Plastics - Standard atmospheres for conditioning and testing. 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 blocking: Unintentional adherence between materials. curred if the surfaces suffer darnage when they are separated or if the forte of adherence between them is sufficient to lift a given weight. Alternative times, temperatures and pressures may be used depending on the nature of the plastic film or sheeting under test and the proposed end use of the material. 4.2 Apparatus 4.2.1 Glass plates, measuring 100 mm x 76 mm and approximately 2 mm thick. 4.2.2 Strips of filter Paper, measuring 150 mm x 76 mm. 4.2.3 Oven, capable of being maintained at 50 “C + 2 “C, with Provision for placing the test as- - semblies on shelves so that they are no less than 50 mm from each other and from the sides of the oven. 4.2.4 Weights, of mass 5,4 kg. 4.2.5 Metal bars, of rectangular Cross-section, 15 mm wide x 76 mm long, weighing 50 g and 100 g. 4.2.6 Metal Clip, with arms approximately 100 mm long . 4.2.7 Double-sided adhesive tape, approximately 12,5 mm wide. 4 Method A: Qualitative method 4.3 Test specimens 4.1 Principle 4.3.1 Shape and dimensions Pieces of film or sheeting are kept in contact with one another for a minimum of 24 h at 50 “C under a pressure of 7 kPa. Blocking is considered to have oc- The specimens shall consist of Strips measuring 150 mm x 76 mm. In the case of film or sheeting SIST EN ISO 11502:2005

ISO 11502:1995(E) 0 ISO with a printed or embossed surface, this side shall be known as the face. The opposite side is called the back. If there is no print or embossing, one side shall be called the face and marked accordingly. 4.32 Preparation Six specimens shall be taken, provided that for printed or coloured film or sheet these include all the colours or colour combinations of the print and base sheeting. If this requirement is not satisfied, additional speci- mens shall be taken. In the case of rolls, all speci- mens shall be taken at least 100 mm from the edge and more than 1 m from the beginning or the end of the roll. The mi
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