ISO INTERNATIONAL 8570 STANDARD First edition 1991-08-15 Plastics --- Film and sheeting -- Determination of cold-crack temperature Plastiques -- Film et feuille -- Determination de la temperature de fragilité a froid Reference number ISO 8570:1991(E) Copyright International Organization for Standardization ovided by IH without license from IHS Not for Resale ISO 8570:1991(E) Foreword Iso (the International Organization for Standardization) is a woridwide federation of national standards bodies (iso member bodies). The work of preparing International Standards is normally carried out through so 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, govern- mental and non-governmentat, in liaison with Iso, also take part in the work. IsO collaborates closely with the Internationat Electrotechnical Commisston (IEC) on all matters of electrotechnical standardization. Draft Internationai Standards adopted by the technical committees are clrculated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IsO 8570 was prepared by Technical Committee ISO/TC 61, Plastics, Sub-Committee SC 11, Products. 1S0 1991 or by any means, electronic or mechanical, including photocopying and microfllm, without permlssion In writing from the publlsher. International Organization for Standardizatfon Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzeriand Copyright intemational Organizationfor Standardization Not for Resale itted without license from IHS INTERNATIONAL STANDARD ISO 8570:1991(E) Plastics -- Film and sheeting --- Determination of cold-crack temperature damage when tested by the method specified in this Scope International Standard. This International Standard specifies a method for assessing the brittleness of plastic film and sheeting Principle 4 at low temperature. Specimens bowed in the shape of a loop are placed The assessment is given in the form of a conven- in a cooling chamber and subjected to sudden fold- tional cold-crack temperature which serves as a ing under the impact of a free-falling mass. guideline for comparing the low-temperature be- haviour of plastic film and sheeting. The test is repeated at temperatures scaled in in- crements of 5'c, commencing when no specimen This method characterizes a finished product of breaks or is damaged and ending when all speci- given thickness and texture, but not its raw-material mens are broken or damaged. composition. Data derived using this International Standard cannot be transposed without limitation to any other shapes or conditions of application. 5 Apparatus The following description is an example of a typica! 2 Normative references test apparatus design (see figure 1).: Other designs can be used provided that the physical principles The following standards contain provisions which. are equivalent. Figure 2 shows another appropriate through reference in this text, constitute provisions design. of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- 5.1 Impact device, comprising the following el- dards are . subject to revision, and parties: to ements: agreements based on this International Standard are encouraged to investigate the possibility of ap- 5.1.1 Specimen holder, permitting the fastening of plying the most recent editions of the standards in- one or more specimens on a platen by means of dicated below.Members of lEC and IsO maintain clamps (e.g. leaf springs) to clench each specimen registers of currentty valid International Standards. along its entire width (15 mm) and to secure 10 mm IsO 291:1977, Plastics of each end of the loop (see figure 1) so that the Standard atmospheres for length of the loop section subjected to folding is conditioning and