1、BRITISH STANDARD CONFIRMED MARCH1992 BS3900-E8: 1974 Incorporating Amendment No.1 Methods of Test for Paints Part E8: Resistance to impact (pendulum test) It is recommended that this part be read in conjunction with the general information in the Introduction to BS3900 issued separately (revised edi
2、tion published March1969). UDC667,61+667.613:620.178.7BS3900-E8:1974 BSI07-1999 ISBN 0 580 08112 5 Foreword NOTEThis Part describes a procedure based on DEF/1053 “Standard methods of testing paint, varnish, lacquer and related products”, Method No.17(b) “Resistance to impact (pendulum test)”. Other
3、related Parts of BS3900 are: Part E3 “Impact (falling weight) resistance”, which describes a method where the depth of indentation of the test panel is controlled; Part E7 “Resistance to impact (falling ball test)”, which describes a method using a free falling ball. A British Standard does not purp
4、ort to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front c
5、over, pagesi andii, pages1to4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date Comments 6908 February1992 Indicate
6、d by a sideline in the marginBS3900-E8:1974 BSI 07-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 Supplementary information 1 3 Apparatus 1 4 Sampling 1 5 Test pieces 1 6 Procedure 2 7 Report of test 2 Figure 1 Apparatus for resistance to impact (pendulum test) 3 Figure 2 Apparatus for
7、 resistance to impact (pendulum test) 4ii blankBS3900-E8:1974 BSI 07-1999 1 1 Scope This Part describes a procedure for determining the resistance of a single-coat film or a multicoat system of paints, varnishes or related products to a single-blow impact by a pendulum. 2 Supplementary information T
8、he method of test described below requires to be completed, for any particular application, by the following supplementary information. This information is to be derived from the British Standard or other specification for the product under test or, where appropriate, is to be the subject of agreeme
9、nt between the interested parties. 1) Material and surface preparation of substrate. 2) Method of application of test coating to substrate. 3) Thickness, in micrometres, of dry coating, including method of measurement in accordance with BS3900-C5 1)and whether it is a single-coat film or a multicoat
10、 system. 4) Duration and conditions of drying of the coated panel (or conditions of stoving and ageing, if applicable) before testing. 5) The test requirements the material has to meet, including the inclination from the vertical of the arms of the test apparatus. 3 Apparatus The apparatus, as illus
11、trated in Figure 1 and Figure 2, consists of two arms, to the ends of which coated steel test pieces are attached. The arms of the apparatus are free to swing in a vertical plane and the test pieces are so fixed that, when the arms are released, the test pieces strike each other at right angles with
12、 a single blow, after which they slide over each other before parting. The apparatus is arranged so that test piece A makes an angle of not more than180 with the line of the outer side of the arm which supports it and this arm is fitted with a ratchet device to ensure that the test pieces do not mak
13、e contact on the return swing of the arms. The mass of the outer arm (excluding the test piece) of the apparatus is3.7 0.1kg, the length is1 0.002m and the centre of gravity is5005mm from the centre of the top bush. The mass of the inner arm (excluding the test piece) is4.5 0.1kg, the length is870 2
14、mm and the centre of gravity is560 5mm from the centre of the top bush. The test pieces shall be arranged so that they strike each other midway along their lengths. 4 Sampling A representative sample of the product to be tested (or of each product in the case of a multicoat system) shall be taken as
15、 described in BS3900-A1 2) . The sample(s) shall then be examined and prepared for testing as described in BS3900-A2 3) . 5 Test pieces 5.1 Material and dimensions. Unless otherwise specified or agreed, the test pieces shall be made of burnished steel tubing complying with BS980, CDS10 4) , in the “
16、as drawn and tempered” or “normalized” condition, with dimensions of28mm internal diameter, 38 0.5mm external diameter and125mm length. 5.2 Preparation and coating of test piece. Unless otherwise specified, the test pieces shall be burnished with silicon carbide paper Grade220 (see BS872 5) ) and th
17、en thoroughly cleaned with white spirit complying with the requirements of BS245 6)to remove any traces of grease. They shall then be coated with the product or system under test by a method agreed between the interested parties (see clause 2). 5.3 Drying the test piece. The coated test pieces shall
18、 be dried (or stoved and aged) for the specified time and under the specified conditions and, unless otherwise specified, shall be conditioned at a temperature of23 2 C and a relative humidity of505% for a minimum of16h. The test procedure shall then be carried out without delay. 5.4 Thickness of co
19、ating. The thickness, in micrometres, of the dry coating shall be determined by the method specified, using one of the procedures in BS3900-C5. 1) 1) BS3900-C5 “Determination of film thickness”. 2) BS3900-A1 “Sampling”. 3) BS3900-A2 “Examination and preparation of samples for testing”. 4) BS980 “Ste
20、el tubes for automobile purposes”. 5) BS872 “Abrasive papers and cloths (technical products)”. 6) BS245 “White spirit”.BS3900-E8:1974 2 BSI 07-1999 6 Procedure 6.1 Attach the test pieces to the arms of the apparatus and fix the arms at the specified inclination from the vertical. Release the arms. 6
21、.2 Remove the test pieces and examine the points of impact for loss of adhesion or removal of the coating. NOTEThe test pieces may be used more than once, provided that the points of impact are well separated from those of previous tests. The test pieces may be skimmed in a lathe to remove indentati
22、ons, provided they remain within the dimensional tolerances. 7 Report of test The test report shall contain at least the following information: 1) A reference to this British Standard. 2) Type and identification of the coating under test. 3) The items of supplementary information referred to in Clau
23、se 2. 4) The British Standard or other document supplying information referred to in Clause 7 3) above. 5) Any deviation, by agreement or otherwise, from the test procedure described. 6) The results of the test in terms of the stated requirements. 7) Date of the test.BS3900-E8:1974 BSI 07-1999 3 Fig
24、ure 1 Apparatus for resistance to impact (pendulum test)BS3900-E8:1974 4 BSI 07-1999 Figure 2 Apparatus for resistance to impact (pendulum test)blankBS3900-E8: 1974 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing
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