1、BRITISH STANDARD BS 1336:1971 Specification for KnottingBS1336:1971 This British Standard, having been approved by the Pigments,Paints and VarnishesIndustry StandardsCommittee, waspublished under the authorityof the Executive Boardon 5 February 1971 BSI 09-1999 First published December 1946 First re
2、vision 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 The Pigments, Paints and Varnishes Industry Standards Committee, under whose supervision this British Standard was p
3、repared, consists of representatives from the following Government departments and scientific and industrial organizations: Board of Trade British Colour Makers Association British Railways Board Chemical Industries Association Crown Agents for Oversea Governments and Administrations Greater London
4、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 Building & Works, Building Research Station Ministry of Technology (Aviation) Ministry of Technology, Laboratory o
5、f the Government Chemist Oil and Colour Chemists Association Paint Manufacturers and Allied Trades Association Paintmakers Association of Great Britain Ltd.* Post Office Research Association of British Paint, Colour and Varnish Manufacturers* Royal Institute of British Architects Royal Institute of
6、Public Health & Hygiene Titanium Pigment Manufacturers Technical Committee White Lead Manufacturers Association Zinc Development Association Zinc Pigment Development Association The scientific and industrial organizations marked with an asterisk in the above list, together with the following, were d
7、irectly represented on the committee entrusted with the preparation of this British Standard: The London Shellac Trade Association Amendments issued since publication Amd. No. Date CommentsBS1336:1971 BSI 09-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 D
8、escription and composition 1 3 Sample 1 4 Solid content 1 5 Appearance of solution 1 6 Drying time of material and appearance of dried film 1 7 Bleeding 1 8 Stain prevention 1 9 Resistance to white spirit 1 10 Standard lac solution 1 Appendix A Method for comparison of bleeding 2 Appendix B Method f
9、or comparison of stain prevention 2 Appendix C Method for comparison of resistance to white spirit 2BS1336:1971 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 metho
10、ds 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 (ball
11、otini 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 purport to
12、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 cover, p
13、agesi andii, pages1 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.BS1336:1971 BSI 09-1999 1 1 Scope This British Standard specifies requirements for knottin
14、g 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 knotting shall be a uniform dispersion of lac or a suitable 1)resin (natural or synthetic) in a suitable solvent. It s
15、hall 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 Clauses4 to9 of this standard. It shall be of such a consistency that it will work freely under the brush. 3 Sample
16、For the purposes of the tests described below, representative samples of not lessthan500ml of the material shall be taken and packed in accordance with BS 3900-A1 2) . 4 Solid content The non-volatile matter of the material shall not be less than 30 % by mass when determined in the manner described
17、in BS 3900-B2 3)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 matter. 6 Drying time of material and appearance of dried film The material when applied at a spreading rate of not more th
18、an 17 g/m 2to a solvent-cleaned glass panel conforming to BS 3900-A3 4)and tested by the method described in BS 3900-C2 5) , shall be surface-dry in 1 h. The dried film shall be bright in appearance. 7 Bleeding The material when tested in the manner described in Appendix A shall not bleed more than
19、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 extent as the standard lac solution. 9 Resistance to white spirit The material when tested in the manner described in
20、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 and9 of this standard shall be made by mixing 2 kg of lac complying with BS 3722 6) , Type III in 5 litres of64 OP industrial methyla
21、ted spirit 7) . 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 performing all the functions of a knotting in a similar manner to the standard lac solution described in Clause 10. 2
22、) 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, “Methods of test for paints”, Part A3, “Standard panels for paint testing”. 5) BS 3900, “Methods of test for paint
23、s”, 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 methylated spirits is governed by the Methylated Spirits Regulations, 1952 (SI 1952, No. 2230).BS1336:1971 2 BSI 09-19
24、99 Appendix A Method for comparison of bleeding A.1 Procedure Apply the knotting by brash to a 150 mm 100 mm solvent-cleaned glass panel conforming to BS 3900-A3 8)at a spreading rate of not more than17 g/m 2and allow it to dry at a temperature of20 2 C and a relative humidity of 65 5 % in a vertica
25、l position. Prepare a test panel in the same manner and at the same time using the standard lac solution. Apply to each coated panel at the same spreading rate a coat of white paint complying with BS 2526 9) . Allow the paint to dry for 16 h at a temperature of20 2 C and a relative humidity of 65 5
26、% and then stove the panels for 2 h at a temperature of45 5 C. Allow the panels 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 point 10)of 110 C to 121 C and a penetration
27、10)of10 to 20 when determined in accordance with BS3235 10) . B.2 Procedure 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/m 2and the standard lac solution similarly to the other bitumen film. Allow the knotting
28、to dry for 30 min at a temperature of20 2 C and a relative humidity of 65 5 %. Age the coated bitumen films for 24 h at a temperature of 20 2 C and a relative humidity of65 5 % and then for 24 h at a temperature of35 2 C. Apply a coat of white paint complying with BS2526 9)to each coated bitumen fil
29、m and allow it to dry at a temperature of 20 2 C and a relative humidity 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
30、3900-A3 8)at a spreading rate of not more than17g/m 2and allow it to dry at a temperature of20 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 BS3900-G1 11) , u
31、singwhite spirit 12)as the immersion liquid, animmersion period of 24 h, and a test temperature of20 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 purpo
32、ses”. 10) BS 3235, “Test methods for bitumen”. 11) BS 3900, “Methods of test for paints”, Part G1, “Resistance to organic liquids”. 12) BS 245, “White spirit”.blankBS1336:1971 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for
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