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1、INTERNATIONAL IS0 STANDARD 7784-l First edition 1997-02-I 5 dUW31 hternat EBoc See Paints and varnishes - Determination of resistance to abrasion - Part 1: Rotating abrasive-paper-covered wheel method Peintures et vernis - DBtermination de la rksistance 9 / abrasion - Partie 1: MBthode utilisant une
2、 roue revgtue de papier abrasif Reference number IS0 7784-1:1997(E) IS0 7784-1:1997(E) Foreword IS0 (the international Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out t
3、hrough IS0 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. IS0 colla
4、borates 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
5、 at least 75 % of the member bodies casting a vote. International Standard IS0 7784-l was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, Genera/ test methods for paints and varnishes. IS0 7784 consists of the following parts, under the general title Paints and va
6、rnishes - Determination of resistance to abrasion: - Part 1: Rotating abrasive-paper-covered wheel method - Part 2: Rotating abrasive rubber wheel method - Part 3: Reciprocating test panel method Annex A forms an integral part of this part of IS0 7784. Annexes B and C are for information only. 0 IS0
7、 1997 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 Standardizati
8、on Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii -,-,- 0 IS0 IS0 7784-1:1997(E) Introduction This document is one of three parts of IS0 7784 dealing with the determination of resistance to abrasion of a dried film of paint, varnish or related product. Parts 1 and 3 both
9、 specify a method using abrasive paper for determination of the resistance to abrasion. In part 2, a method using abrasive rubber wheels is described. The user of IS0 7784 should note that the methods using abrasive paper (parts 1 and 3) are the preferred methods. . . . III , -,-,- INTERNATIONAL STA
10、NDARD 0 IS0 IS0 7784-1:1997(E) Paints and varnishes - Determination of resistance to abrasion - Part I: Rotating abrasive-paper-covered wheel method 1 Scope This part of IS0 7784 is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products. This par
11、t of IS0 7784 specifies a method for determining the resistance to abrasion of a dried film of paint, varnish or related product, using abrasive paper attached to wheels and abrading by making a rotary movement. 2 Normative references The following standards contain provisions which, through referen
12、ce in this text, constitute provisions of this part of IS0 7784. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 7784 are encouraged to investigate the possibility of applying the most recent ed
13、itions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 4811994, Rubber - Determination of hardness (hardness between 30 and 85 IRHD). IS0 1512:1991, Paints and varnishes - Sampling of products in liquid or paste form. IS0 15
14、1311992, Paints and varnishes - Examination and preparation of samples for testing. IS0 1514: 1993, Paints and varnishes - Standard pane/s for testing. IS0 2808:-l), Paints and varnishes - Determination of film thickness. IS0 6507-I :1982, Metallic materials - Hardness test - Vickers test - Part 7:
15、HV 5 to HV 100. 3 Principle A dried paint or varnish film is abraded, under specified conditions, with abrasive paper which is attached to the wheels of an abrasion testing machine. During the test, the wheels are loaded with specified weights. The 1) To be published. (Revision of IS0 2808:1991) 1 -
16、,-,- IS0 7784-1:1997(E) IS0 resistance to abrasion is calculated as the loss in mass after a specified number of abrasion cycles or as the number of cycles required to remove the coating down to the next layer or down to the substrate. 4 Required supplementary information For any particular applicat
17、ion, the test method specified in this part of IS0 7784 needs to be completed by supplementary information. The items of supplementary information are given in annex A. 5 Apparatus 5.1 Abrasion testing machinez), consisting of the elements described in 5.1 .I to 51.4 (see also figure 1). 5.1.1 Turnt
18、able, capable of rotating at a speed of (60 + 2) rpm, on which the test panel can be centrally mounted and firmly attached. 5.1.2 Two rubber wheels, each of thickness (12.7 + 0,2) mm and overall diameter (50,O the air pressure in the suction device shall be I,5 kPa3) to I,6 kPa3) lower than atmosphe
19、ric pressure. 5.2 Weights, to enable the mass of each wheel to be increased by up to 1 kg. 5.3 Strips of abrasive paper, of width (12 + 0,2) mm and approximate length 175 mm. The grade of abrasive paper shall be chosen by agreement between the interested parties. NOTES 1 Several grades of abrasive p
20、aper are defined in the P series of the grain size standard published by the Federation of European Producers of Abrasive Products (FEPAj4). 2 Self-adhesive abrasive paper is also available from some manufacturers. 5.4 Double-sided adhesive tape, in strips of width (12 k 0.2) mm and approximate leng
21、th 175 mm, for use if self-adhesive abrasive paper is not available. 5.5 Calibration panel, of thickness between 0,8 mm and 1 mm, for calibration of the apparatus (see annex B). 5.6 Balance, with an accuracy of 0,l mg. 2) This apparatus is commercially available from Teledyne Taber, 455 Bryant Stree
22、t, North Tonawanda, NY 14120, USA. 3) 1 kPa = 10 mbar. 4) FEPA Standard 43GB-1984, obtainable from the British Abrasive Federation, P.O. Box 58, Trafford Park Road, Trafford Park, Manchester Ml 7 1 JD, United Kingdom. 2 -,-,- 0 IS0 IS0 7784-1:1997(E) 6 Sampling Take a representative sample of the pr
23、oduct to be tested (or of each product in the case of a multi-coat system), as described in IS0 1512. Examine and prepare each sample for testing, as described in IS0 1513. Dimensions in millimetres / I _. . ; -._- Lj7%y Key 1 Abrasive wheels 2 Test specimen 3 Wear zone 4 Vacuum nozzles 08f0,5 Figur
24、e 1 - Diagrammatic arrangement of apparatus 3 IS0 7784-1:1997(E) 7 Test panels 7.1 Substrate Unless otherwise agreed, select the substrate from one of those described in IS0 1514, using, where possible, the same type of material as will be used in practice. The substrate panels shall be plane and fr
25、ee from distortion, otherwise the wear of the coating under test will not be uniform. 7.2 Shape and dimensions The shape and dimensions of the test panels shall be such that they can be fitted correctly on the apparatus. They shall have a central hole of diameter 6,35 mm. NOTE - Typical dimensions f
26、or a test panel are 100 mm x 100 mm. 7.3 Preparation and coating Unless otherwise agreed, prepare each test panel in accordance with IS0 1514 and then coat it by the specified method with the product or system under test. 7.4 Drying and conditioning Dry (or stove) and age, if applicable, each coated
27、 test panel for the specified time under the specified conditions. 7.5 Thickness of coating Determine the thickness, in micrometres, of the dried coating by one of the methods specified in IS0 2808. 8 Procedure 8.1 Test conditions Carry out the test at a temperature of (23 + 2) “C and a relative hum
28、idity of (50 + 5) %, unless otherwise agreed. 8.2 Calibration of the apparatus Calibrate the apparatus (an example of a calibration procedure is given in annex B). 8.3 Preparation of the abrading wheels 8.3.1 Adjust the load on the wheels to the value agreed on between the interested parties. 8.3.2
29、Condition the abrasive paper and the adhesive tape, if used, at a temperature of (23 + 2) “C and a relative humidity of (50 f) the results of the test as indicated in clause 9; 9) whether the surface had to be pre-abraded because of surface irregularities; h) any deviation from the test method speci
30、fied; i) the date of the test. all details necessary to identify the product tested; reference to this part of IS0 7784 (IS0 7784-l I; the items of supplementary information referred to in annex A; a reference to the international of national standard, product specification or other document supplyi
31、ng the information referred to in c); 6 , -,-,- 0 IS0 IS0 7784-1:1997(E) Annex A (normative) Required supplementary information The items of supplementary information listed in this annex shall be supplied as appropriate to enable the method to be carried out. The information required should prefera
32、bly be agreed between the interested parties and may be derived, in part or totally, from an international or national standard or other document related to the product under test. a) Substrate material, substrate thickness and surface preparation of the substrate. b) Method of application of the te
33、st coating to the substrate, including the duration and conditions of drying between coats in the case of a multi-coat system. c) Duration and conditions of drying (or staving) and ageing, if applicable, of the coating before testing. d) Thickness, in micrometres, of the dry coating and the method o
34、f measurement in accordance with IS0 2808, and whether it is a single coat or a multi-coat system. e) Temperature and humidity during the test, if different from those specified in 8.1. 7 -,-,- IS0 7784-1:1997(E) Annex B (informative) Calibration of the apparatus B. 1 General The accessories needed
35、for calibration, such as calibration panels and the abrasive paper, should preferably be obtained from the manufacturer of the abrasion tester. Usually, zinc panels are delivered as calibration panels by the manufacturer. B.2 Calibration procedure B.2.1 Use FEPA grade PI 80 paper. B.2.2 Condition th
36、e abrasive paper, the adhesive tape, if used, and the test panel at a temperature of (23 * 2) “C and a relative humidity of (50 t- 5) %, unless otherwise agreed, for a minimum period of 16 h. B.2.3 Attach a conditioned abrasive-paper strip to the circumference of the wheels, using the conditioned ad
37、hesive tape, if necessary. Adjust the length of each strip so that it covers the peripheral surface of the wheel without any overlap or gap. NOTE - It is recommended that the strips be cut at an angle of approximately 45” so that the joint is not at right angles to the direction of travel of the whe
38、els (see figure 2). B.2.4 If a new zinc panel is being used, abrade it for 200 cycles of the turntable before use, following the procedure specified in B.2.6 and B.2.7, and then clean it with lint-free paper. B.2.5 Weigh the conditioned test panel to the nearest 1 mg, and record this mass. B.2.6 Ins
39、tall a 500 g load on each arm of the abrasion testing machine, attach the test panel to the turntable, lower the abrading heads on to the test panel and place the suction nozzles in position. B.2.7 Set the counter to zero and start up the suction and then the turntable. B.2.8 After 500 cycles, clean
40、 the test panel with lint-free paper, reweigh the test panel and record this mass. B.2.9 Carry out B.2.3 to B.2.8 twice more, each time with a new strip of abrasive paper. B.2.10 After the third test, calculate the mean loss in mass for the three calibration runs. B.2.11 The average loss in mass of
41、the zinc plate should be (110 + 30) mg. If the average loss in mass is outside this range, check the apparatus and rectify any faults. 8 -,-,- IS0 7784-1:1997(E) Annex C (informative) Precision No relevant precision data are currently available. If numerical values are to be measured, this method sh
42、ould be performed in only one laboratory. In case of work between laboratories, it is better to use rankings for the coatings. lSO/TC 35 intends to obtain precision data for all relevant standards, including this part of IS0 7784. When precision data are available, they will be incorporated in the document. 9 IS0 7784-1:1997(E) ICS 87.040 Descriptors: paints, varnishes, paint coats, tests, wear tests, abrasion tests, determination, wear resistance, abrasion resistance, test equipment. Price based on 9 pages