ISO INTERNATIONAL STANDARD 8295 Secondedition 1995-10-01 Plastics Film and sheeting Determination of the coefficients of friction Plastiques - Film et feuille -- Détermination des coefficients defrottement ISO Reference number ISO 8295:1995(E) No reproductic networking permitted without license from IHS ISO 8295:1995(E) Foreword IsO(theInternationalOrganization forStandardization)isaworldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each 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 (lEC) 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 8295 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products. This second edition cancels and replaces the e first edition (IS0 8295:1986), which has been technically revised. Annex A of this International Standard is for information only. ISO1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by, any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii d without license from IHS Not for Resale INTERNATIONAL STANDARD ISO ISO 8295:1995(E) Plastics -- Film and sheeting - Determination of the coefficients of friction 1 Scope cent edition of the standard indicated below. Mem- bers of IEC and ISO maintain registers of currently valid International Standards. 1.1 This International Standard specifies a method for determining the coefficients of starting and sliding IsO 291:1977, Plastics Standard atmospheres for friction of plastic film and sheeting when sliding over conditioning and testing. itselforothersubstances.Themethodisintendedto beusedfornon-stickyplasticfilmandsheetingfinthe following text, referred to simply as "film") of up to 3Definitions approximately 0,5 mm thickness. For the purposes of this International Standard, the 1.2 This test method serves primarily for quality following definitions apply. control. It does not give a comprehensive assessment of the machinability on packaging or processing ma- 3.1 friction: The resistance that two surfaces lying chines since other effects, e.g. electrostatic charges, in contact with each other build up against sliding. air cushion, local rise of temperature and abrasion are, A distinction is made between static friction and as a rule, involved. dynamic friction. 1.3 The static frictional force increases as a rule. 3.1.1 static friction: Friction which has to be over- with the time the surfaces are in contact. Therefore, come as a "threshold value" at the onset of sliding to get comparable results, this time span is specified. motion. 3.1.2 dynamic friction: Friction which persists dur- 1.4 Slip properties are sometimes generated by ad- inga slidingmotion ata given speed. ditives intheplastic material.The additives have varying degrees of compatibility with the film matrix 3.2 frictional force: The force necessary to over- They may bloom or exude to the surface and change come friction. A distinction is made between the the slipproperties.Sincethese effectsaretime- static frictional force Fs and the dynamic frictional dependent, measurements on such films have to be force Fp. related to the age of the fi