1、BRITISH STANDARD CONFIRMED JUNE1986 BS3900-E7: 1974 Falling ball impact Incorporating Amendment Nos.1 and 2 Methods of Test for Paints Part E7: Resistance to impact (fallingball test) It is recommended that this Part be read in conjunction with the general information in the Introduction to BS3900is
2、sued separately (revised edition published March1969) UDC667.61+667.613:620.178.7BS3900-E7:1974 BSI 03-1999 ISBN 0 580 08102 8 Foreword NOTEThis Part describes a procedure based on DEF/1053 “Standard methods of testing paint, varnish, lacquer and related products”, Method No.17(c) “Resistance to imp
3、act Falling ball”. Other related Parts of BS3900are: Part E3: “Impact (falling weight) resistance”, which describes a method where the depth of indentation of the test panel is controlled, whereas in this Part (E7) there is no control of the depth of indentation; Part E8: “Resistance to impact (pend
4、ulum test)”, which describes a method in which resistance to a single-blow impact by a pendulum is determined. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Britis
5、h Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1and2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be i
6、ndicated in the amendment table on theinside front cover. Amendments issued since publication Amd. No. Date of issue Comments 2518 April 1978 6909 February 1992 Indicated by a sideline in the marginBS3900-E7:1974 BSI 03-1999 i Content Page Foreword Inside front cover 1 Scope 1 2 Supplementary inform
7、ation 1 3 Apparatus 1 4 Sampling 1 5 Test panel 1 6 Procedure 1 7 Test report 2ii blankBS3900-E7:1974 BSI 03-1999 1 1 Scope This Part describes a procedure for determining the resistance to impact of a single-coat film or a multicoat system of paints, varnishes, or related products, using a free fal
8、ling ball. The method is specifically intended to test products on substrates which are not significantly distorted in the test. 2 Supplementary information The method of test described below requires to be completed, for any particular application, by the following supplementary information. This i
9、nformation 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 agreement between the interested parties. 1) Material and surface preparation of substrate. 2) Method of application of test coating to substrate. 3)
10、 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 system. 4) Duration and conditions of drying of the coated panel (or conditions of stoving and ageing, if applicable) before testing. 5) W
11、hether the test is to be carried out with the test coating facing upwards or downwards. 6) The test requirements the material has to meet. 3 Apparatus 3.1 Hardened steel ball, approximately60mm in diameter and of mass900 10g, unless otherwise specified. 3.2 Device, e.g.an electromagnet for holding a
12、nd releasing the steel ball at a specified height above the test panel. 3.3 Supporting frame, on which the test panel rests in a horizontal position so as to leave an area180mm180mm unsupported. 4 Sampling A representative sample of the product to be tested (or of each product in the case of a multi
13、coat system) shall be taken as described in BS3900-A1 2) . The sample(s) shall then be examined and prepared for testing as described in BS3900-A2 3) . 5 Test panel 5.1 Material and dimensions. Unless otherwise specified or agreed, the test panel shall be of burnished steel, approximately200mm200mm
14、and at least5mm thick, complying with the requirements of BS1449-1 4) , HRP43/25. 5.2 Preparation and coating of panel. Unless otherwise specified, the test panel shall be prepared as described in BS3900-A3 5)and shall then be coated with the product or system under test by a method agreed between t
15、he interested parties (seeclause 2). 5.3 Drying the test panel. The coated test panel shall 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 of 23 2 C and a relative humidity of505% for a mi
16、nimum of16h. The test procedure shall then be carried out as soon as possible. 5.4 Thickness of coating. The thickness, in micrometres, of the dry coating shall be determined by the method specified, using one of the procedures in BS3900-C5 6) . 6 Procedure 6.1 Place the panel on the supporting fram
17、e with the test coating facing upward or downwards as specified. Release the steel ball and allow it to fall freely from a height of3m, unless otherwise specified, so that it strikes the panel approximately in the centre. Repeat this procedure so that the second point of impact is as close to the fi
18、rst as possible and, in any case, is not more than20mm from it. 6.2 Remove the panel from the supporting frame and examine the coating for signs of cracking, flaking and detachment from the substrate. 1) BS3900-C5 “Determination of film thickness” 2) BS3900-A1 “Sampling”. 3) BS3900-A2 “Examination a
19、nd preparation of samples for testing”. 4) BS1449, “Steel plate, sheet and strip”, Part1 “Carbon steel plate, sheet and strip”. 5) BS3900-A3 “Standard panels for paint testing”. 6) BS3900-C5 “Determination of film thickness”.BS3900-E7:1974 2 BSI 03-1999 7 Test report The test report shall contain at
20、 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 Clause2. 4) The British Standard or other document supplying the information referred to in Clause7 3) above. 5) A
21、ny deviation, by agreement or otherwise, from the standard test procedure described. 6) The results of the test in terms of the stated requirements. 7) Date of the test.blankBS3900-E7: 1974 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body r
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