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1、BRITISH STANDARD BS 1336:1971 Specification for Knotting Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:15:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1336:1971 This British Standard, having been approved by the Pigments, Paints and Varnishes Industry Standards Committee, was publish
2、ed under the authority of the Executive Board on 5 February 1971 BSI 09-1999 First published December 1946 First revision February 1971 The following BSI references relate to the work on this standard: Committee reference PVC/- Draft for comment 69/25274 ISBN 580 06445 X Co-operating organizations T
3、he Pigments, Paints and Varnishes Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Board of Trade British Colour Makers Association British Rail
4、ways Board Chemical Industries Association Crown Agents for Oversea Governments and Administrations Greater London Council Lead Oxide Convention London Transport Executive Ministry of Defence, Army Department Ministry of Defence, Navy Department Ministry of Public Building & Works Ministry of Public
5、 Building & Works, Building Research Station Ministry of Technology (Aviation) Ministry of Technology, Laboratory of the Government Chemist Oil and Colour Chemists Association Paint Manufacturers and Allied Trades Association Paintmakers Association of Great Britain Ltd.* Post Office Research Associ
6、ation of British Paint, Colour and Varnish Manufacturers* Royal Institute of British Architects Royal Institute of Public Health & Hygiene Titanium Pigment Manufacturers Technical Committee White Lead Manufacturers Association Zinc Development Association Zinc Pigment Development Association The sci
7、entific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: The London Shellac Trade Association Amendments issued since publication Amd. No.DateCommen
8、ts Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:15:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1336:1971 BSI 09-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Description and composition1 3Sample1 4Solid content1 5Appearance of solution1 6Dryin
9、g time of material and appearance of dried film1 7Bleeding1 8Stain prevention1 9Resistance to white spirit1 10Standard lac solution1 Appendix A Method for comparison of bleeding2 Appendix B Method for comparison of stain prevention2 Appendix C Method for comparison of resistance to white spirit2 Lic
10、ensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:15:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1336:1971 ii BSI 09-1999 Foreword This standard makes reference to the following British Standards: BS 245, White spirit. BS 2526, White finishing paints for protective purposes. BS 3235, Test
11、methods for bitumen. BS 3591, Industrial methylated spirits. BS 3722, Machine-made shellac. BS 3900, Methods of test for paints. BS 3900-A1, Sampling. BS 3900-A3, Standard panels for paint testing. BS 3900-B2, Determination of volatile matter and non-volatile matter. BS 3900-C2, Surface-drying test
12、(ballotini method). BS 3900-G1, Resistance to organic liquids. This British Standard was first published in 1946 under the authority of the Chemical Divisional Council. The present revision has been brought up to date in respect of its technical content and layout. A British Standard does not purpor
13、t 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 cov
14、er, pages i and ii, pages 1 and 2 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:15:38 GMT+00:00 2006, U
15、ncontrolled Copy, (c) BSI BS 1336:1971 BSI 09-19991 1 Scope This British Standard specifies requirements for knotting used in the preparation of joinery for painting as an impervious covering for knots and other resinous areas liable to stain superimposed paints. 2 Description and composition The kn
16、otting shall be a uniform dispersion of lac or a suitable1) resin (natural or synthetic) in a suitable solvent. It shall produce a film which is unaffected by the natural solvents present in resinous knots or by the solvents commonly used in paint and shall comply with the requirements specified in
17、Clauses 4 to 9 of this standard. It shall be of such a consistency that it will work freely under the brush. 3 Sample For the purposes of the tests described below, representative samples of not less than 500 ml of the material shall be taken and packed in accordance with BS 3900-A12). 4 Solid conte
18、nt The non-volatile matter of the material shall not be less than 30 % by mass when determined in the manner described in BS 3900-B23) using 5 g of material. 5 Appearance of solution Apart from the normal turbidity of lac solutions, the material shall be free from visible aggregates and foreign matt
19、er. 6 Drying time of material and appearance of dried film The material when applied at a spreading rate of not more than 17 g/m2 to a solvent-cleaned glass panel conforming to BS 3900-A34) and tested by the method described in BS 3900-C25), shall be surface-dry in 1 h. The dried film shall be brigh
20、t in appearance. 7 Bleeding The material when tested in the manner described in Appendix A shall not bleed more than the standard lac solution. 8 Stain prevention The material when tested in the manner described in Appendix B shall prevent discoloration of the white paint film to at least the same e
21、xtent as the standard lac solution. 9 Resistance to white spirit The material when tested in the manner described in Appendix C shall not show a greater degree of softening than the standard lac solution. 10 Standard lac solution The standard lac solution referred to in Clauses 7, 8 and 9 of this st
22、andard shall be made by mixing 2 kg of lac complying with BS 37226), Type III in 5 litres of 64 OP industrial methylated spirit7). The lac shall be dispersed to form a uniform varnish free from aggregates. 1) The term “suitable” is intended to convey that the material selected shall be capable of pe
23、rforming all the functions of a knotting in a similar manner to the standard lac solution described in Clause 10. 2) BS 3900, “Methods of test for paints” , Part A1, “Sampling”. 3) BS 3900, “Methods of test for paints”, Part B2, “Determination of volatile matter and non-volatile matter”. 4) BS 3900,
24、 “Methods of test for paints”, Part A3, “Standard panels for paint testing”. 5) BS 3900, “Methods of test for paints”, Part C2, “Surface-drying test (ballotini method)”. 6) BS 3722, “Machine-made shellac”. 7) BS 3591, “Industrial methylated spirits”. It should be noted that the use of industrial met
25、hylated spirits is governed by the Methylated Spirits Regulations, 1952 (SI 1952, No. 2230). Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:15:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1336:1971 2 BSI 09-1999 Appendix A Method for comparison of bleeding A.1 Procedure Apply the knot
26、ting by brash to a 150 mm 100 mm solvent-cleaned glass panel conforming to BS 3900-A38) at a spreading rate of not more than 17 g/m2 and allow it to dry at a temperature of 20 2 C and a relative humidity of 65 5 % in a vertical position. Prepare a test panel in the same manner and at the same time u
27、sing the standard lac solution. Apply to each coated panel at the same spreading rate a coat of white paint complying with BS 25269). Allow the paint to dry for 16 h at a temperature of 20 2 C and a relative humidity of 65 5 % and then stove the panels for 2 h at a temperature of 45 5 C. Allow the p
28、anels to stand for 7 days and compare the two panels for bleeding. Appendix B Method for comparison of stain prevention B.1 Material Blown bitumen, having a ring and ball softening point10) of 110 C to 121 C and a penetration10) of 10 to 20 when determined in accordance with BS 323510). B.2 Procedur
29、e Cast films of the bitumen in two moulds and allow to cool. Apply the knotting by brush to one bitumen film at a spreading rate of 17 g/m2 and the standard lac solution similarly to the other bitumen film. Allow the knotting to dry for 30 min at a temperature of 20 2 C and a relative humidity of 65
30、 5 %. Age the coated bitumen films for 24 h at a temperature of 20 2 C and a relative humidity of 65 5 % and then for 24 h at a temperature of 35 2 C. Apply a coat of white paint complying with BS 25269) to each coated bitumen film and allow it to dry at a temperature of 20 2 C and a relative humidi
31、ty of 65 5 %. Compare the two white paint films for staining. Appendix C Method of comparison of resistance to white spirit C.1 Procedure Apply the knotting by brush to a 150 mm 100 mm solvent-cleaned glass panel conforming to BS 3900-A38) at a spreading rate of not more than 17 g/m2 and allow it to
32、 dry at a temperature of 20 2 C and a relative humidity of 65 5 % in a vertical position. Prepare a test panel in the same manner and at the same time using the standard lac solution. Carry out the test described in BS 3900-G111), using white spirit12) as the immersion liquid, an immersion period of
33、 24 h, and a test temperature of 20 2 C. Compare the films for softening or other defects. 8) BS 3900, “Methods of test for paints”, Part A3, “Standard panels for paint testing”. 9) BS 2526, “White finishing paints for protective purposes”. 10) BS 3235, “Test methods for bitumen”. 11) BS 3900, “Meth
34、ods of test for paints”, Part G1, “Resistance to organic liquids”. 12) BS 245, “White spirit”. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:15:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:15:38 GMT+00:00 2006, Uncontrolled
35、 Copy, (c) BSI BS 1336:1971 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.
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42、odies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the fr
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