ISO INTERNATIONAL STANDARD 7765-1 First edition 1988-12-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXKAYHAPOAHAR OPTAHW3ALMH O CTAHAAPTW3ALMN Plastics film and sheeting -- Determination of impact resistance by the free-falling dart method Part 1: Staircase methods Film et feuille de plastiques - Determination de la resistance au choc par la methode par chute libre de projectile Partie 1:Methodes dites de 《l'escalier) Reference number ISO 7765-1 : 1988 (E) Not for Resale ISO T765-1 : 1988 (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. 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-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. the member bodies for approval before their acceptance as international Standards by the Iso Council. They are approved in accordance with Iso procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7765-1 was prepared by Technical Committee ISO/TC 61, Plastics. Iso 7765 consists of the following parts, under the general title Plastics film and sheeting -- Determination of impact resistance by the free-falling dart method: Part 1: Staircase methods Part 2: Instrumented puncture test @ International Organization for Standardization, 1988 Printed in Switzerland ted without license from IHS Not for Resale INTERNATIONAL STANDARD 1SO 7765-1 : 1988 (E) Plastics film and sheeting - Determination of impact resistance by the free-falling dart method Part 1: Staircase methods Scope iso 4591 : 1979, Plastics -- Film and sheeting - Determination 1 of average thickness of a sample and average thickness and yield of a roll, by gravimetric techniques (gravimetric 1.1 This part of ISO 7765 specifies methods for the deter- thickness). mination of the energy that causes plastics film and sheet less than 1 mm in thickness to fail under specified conditions of im- IS04593:1979,Plastics -Filmandsheeting-Determination pact of a free-falling dart from a specified height that would of thickness by mechanical scanning. result in failure of 50 % of the specimens tested. 3 Significance 1.2 Two methods of test are described. 3.1 Methods A and B are used to establish the mass of the 1.2.1 Method A employs a dart with a 38 mm ± 1 mm dart causing 50 % of the specimens to fail under the conditions diameter hemispherical head dropped from a height of specified. Data obtained by one method cannot be compared 0,66 m ± 0,01 m. This method may be used for materials directly with those from the other method, nor with those whose impact resistance requires masses of about 0,05 kg to obtained from tests employing different conditions of missile about 2 kg to fracture them. velocity, missile impinging surface diameter, effective speci- men diameter, and specimen thickness. The resuits obtained with particular values of these test variables are highly depen- 1.2.2 Method B employs a dart with a 50 mm ± 1 mm dent on the method of fabrication of the film or sheeting. diameter hemispherical head dropped from a height of 1,50 m ± 0,01 m. Its range of applicability is from about 0,3 kg The results obtained by methods A and B are greatly in- 3.2 to about 2 kg. fluenced by the quality of the material under test. The con- fidence limits of data obtained by this procedure can, therefore, 1.3 The measurement technique is the staircase method. A vary significantly, depending on the sample quality, uniformity of gauge, die marks, contaminants, etc. uniform missile ma