1、BRITISH STANDARD BS 282, 389: 1963 Specifications for Lead chromes and zinc chromes for paintsBS282, 389:1963 This British Standard, having been approved by the Pigments, Paints and Varnishes Industry Standards Committee and endorsed by the Chairman of theChemical Divisional Council, was published u
2、nder the authorityof the General Councilon 6February1963 BS282 First published May1927 BS389 First published March1929 First revision combining BS282 and BS389November1938 Second revision April1953 Third revision February1963 BSI 01-2000 The following BSI references relate to the work on this standa
3、rd: Committee references PVC/1, PVC/1/8 Draft for comment AA(PVC)667 ISBN 0 580 34468 1 Co-operating organizations The Pigments, Paints and Varnishes Industry Standards Committee under the supervision of which this British Standard was prepared consists of representatives from the following Governme
4、nt departments and scientific and industrial organizations: Admiralty* Air Ministry Association of British Chemical Manufacturers* Board of Trade British Colour Makers Association* British Railways, British Transport Commission Crown Agents for Oversea Governments and Administrations* D.S.I.R. Build
5、ing Research Station* D.S.I.R. Laboratory of the Government Chemist Incorporated Institute of British Decorators* Lead Oxide Convention* London County Council Ministry of Aviation Ministry of Public Building and Works* National Federation of Builders and Plumbers Merchants Oil & Colour Chemists Asso
6、ciation* Paint Manufacturers and Allied Trades Association* Paint Manufacturers Joint Executive Council* Post Office Research Association of British Paint, Colour & Varnish Manufacturers* Royal Institute of British Architects Royal Institute of Public Health and Hygiene Titanium Pigment Manufacturer
7、s Technical Committee* War Office* White Lead Convention* Zinc Development Association* Zinc Pigment Development Association The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the
8、 committee entrusted with the preparation of this British Standard: British Electrical & Allied Manufacturers Association National Federation of Master Painters & Decorators of England & Wales Amendments issued since publication Amd. No. Date CommentsBS 282, 389:1963 BSI 01-2000 i Contents Page Co-o
9、perating organizations Inside front cover Foreword iii Lead chromes 1 Scope and description 1 2 Composition 1 3 Sample 1 4 Agreed sample 1 5 Residue on sieve 1 6 Matter volatile at 100 C 1 7 Matter soluble in water 1 8 Oil absorption value 1 9 Colour 1 10 Stability of colour to light 1 11 Staining p
10、ower and colour on reduction 1 12 Soluble lead 1 Zinc chrome, Type1 1 Scope and description 2 2 Composition 2 3 Sample 2 4 Agreed sample 2 5 Residue on sieve 2 6 Matter volatile at 100 C 2 7 Oil absorption value 2 8 Colour 2 9 Staining power and colour on reduction 2 10 Freedom from impurities 2 Zin
11、c chrome, Type2 1 Scope and description 3 2 Composition 3 3 Sample 3 4 Agreed sample 3 5 Residue on sieve 3 6 Matter volatile at 100 C 3 7 Oil absorption value 3 8 Freedom from impurities 3 9 Water-soluble chromates 3 Zinc chrome, Type3 1 Scope and description 4 2 Composition 4 3 Sample 4 4 Agreed s
12、ample 4 5 Residue on sieve 4 6 Matter volatile at 100 C 4 7 Oil absorption value 4 8 Freedom from impurities 4 Appendix A Method for the detection of the presence of organic colours andlakes 5 Appendix B Method for the determination of residue on sieve 5BS282, 389:1963 ii BSI 01-2000 Page Appendix C
13、 Method for the determination of matter volatile at 100 C 6 Appendix D Method for the determination of matter soluble in water, and acidity or alkalinity of the water extract 6 Appendix E Method for the determination of oil absorption value 7 Appendix F Method for the comparison of colour 8 Appendix
14、 G Method for the comparison of stability to light 8 Appendix H Method for the comparison of staining power and colour on reduction 9 Appendix J Method for the determination of soluble lead in lead chromes 10 Appendix K Method for the estimation of total lead in lead chromes 11 Appendix L Method for
15、 the determination of matter insoluble in ammoniacal ammonium chloride solution 12 Appendix M Method for the determination of water soluble sulphates, chlorides and nitrates and total water soluble matter 13 Appendix N Method for the determination of water soluble chromate 14 Appendix O Method for t
16、he determination of zinc content 14 Appendix P Method for the determination of alkali metals 15 Appendix Q Method for the determination of chromate content 15BS 282, 389:1963 BSI 01-2000 iii Foreword This standard makes reference to the following British Standards: BS 242, Refined linseed oil for pa
17、ints. BS 245, White spirit. BS 254, Zinc oxide (Types 1 and 2). BS 410, Test sieves. BS 612, Nessler cylinders. BS 846, Burettes and bulb burettes. BS 950, Artificial daylight fittings for colour matching. BS 1752, Sintered disk filters for laboratory use. BS 1792, One-mark volumetric flasks. BS 179
18、5, Extenders for paints. BS 1851, Titanium dioxide pigments for paints. When the British Standard for lead chromes, BS282, was first issued, the main criterion of value of a lead chrome was that it should consist entirely of water-insoluble compounds of lead. In1953, when the specification was last
19、revised, the position was substantially the same, for although newer types of lead chromes had by then appeared their use was still on a small scale. Since then, however, there has been an increasing use of so-called “treated chromes” in which considerably improved properties, particularly greater r
20、esistance to darkening under the action of light, have been achieved by surface treatment of chromes under carefully controlled conditions. Such chromes cannot consist wholly of water-insoluble compounds of lead and hence do not conform to the requirements of BS282:1953. Because of the nature and va
21、riety of the treating agents to lay are used (and those which may be used in the future) it is impracticable which down a composition specification which would not be undesirably restrictive. In any case such a specification would be of no assistance to users of these pigments in assessing their val
22、ue in actual performance. The specification has, therefore, been rewritten so as to cover, with safeguards, both treated and untreated types of chromes. The method for the determination of aluminium given in BS282:1953 is no longer required and has been omitted. The changes in the case of the Britis
23、h Standard for zinc chromes, BS389, are almost entirely of an editorial character. A separate specification has been written for each of the three types of zinc chrome, which, it is thought, will be clearer and more convenient than the arrangement followed in BS389:1953. The test for matter insolubl
24、e in ammonia solution in the1953 specification has been replaced by a test for insolubility in ammoniacal ammonium chloride solution, which gives more consistent results. In the case of the Type3material, an upper limit has been imposed on the metallic zinc content. The test methods in the Appendice
25、s have undergone editorial rearrangement to bring them into line with current practice in British Standards. 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 British
26、Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages1to 15 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be i
27、ndicated in the amendment table on the inside front cover.iv blankBS 282, 389:1963 BSI 01-2000 1 Lead chromes 1 Scope and description This British Standard applies to lead chromes for use in paints, both those consisting wholly of water-insoluble compounds of lead and those containing additions intr
28、oduced specifically to improve certain pigmentary properties. It is not intended to apply to mixtures of lead chromes with other separately prepared lead compounds other than chromes nor to mixtures with extenders or diluents. The material shall be in the form of a dry soft powder or in such a condi
29、tion that it may be readily reduced thereto by crushing under a palette knife, without necessitating any grinding action. 2 Composition The purchaser may require the vendor to declare whether the lead chrome is of an untreated or treated type. In the former case it shall consist wholly of water-inso
30、luble compounds of lead, except as provided by Clause7. In the case of treated chromes the purchaser may require the vendor to state the nature of the improved properties which are claimed to result from the treatment and may require the vendor to state the minimum percentage content of lead determi
31、ned in the manner described inAppendix K. In all cases the material shall be free from organic colours and lakes when tested in the manner described inAppendix A. 3 Sample For the purpose of examination representative samples shall be taken at random from not less than10per cent of the original and
32、previously unopened containers. The material shall be thoroughly mixed and shall then be divided into triplicate samples weighing not less than0.45kg (1lb) each. These shall be packed in clean, dry, air-tight, non-absorbent, opaque or dark glass containers on which the sample has no action. The cont
33、ainers shall be of such a size that they are nearly filled by the sample. Each sample container so filled shall be sealed and shall be marked with full details and date of sampling. 4 Agreed sample Except where otherwise agreed between the purchaser and the vendor, the agreed sample referred to in C
34、lauses8, 9, 10 and11 shall be one and the same sample and shall comply in all respects with the other requirements of this specification. The sample shall weigh not less than0.45kg (1lb) and shall be packed in the manner specified in Clause3. 5 Residue on sieve The material shall not leave more than
35、0.5per cent by weight of residue when tested in the manner described inAppendix B. 6 Matter volatile at 100 C The loss in weight, on heating the material in the manner described inAppendix C, shall not exceed1.0per cent. 7 Matter soluble in water The material shall not yield more than1.0per cent by
36、weight of matter soluble in water when tested in the manner described inAppendix D. The acidity or alkalinity of the aqueous extract, when determined in the manner described inAppendix D, shall not exceed the equivalent of0.1per cent by weight of sulphuric acid, H 2 SO 4 , or sodium carbonate, Na 2
37、CO 2calculated on the material. 8 Oil absorption value The oil absorption value of the material, when determined in the manner described inAppendix E, shall be within 10per cent of the oil absorption value of the agreed sample. 9 Colour The colour of the material shall closely match that of the agre
38、ed sample, when compared in the manner described inAppendix F. 10 Stability of colour to light The colour of the material shall not change to a greater extent than that of the agreed sample, when compared in the manner described inAppendix G. 11 Staining power and colour on reduction The staining po
39、wer of the material shall not be inferior to, and the colour on reduction shall closely match, that of the agreed sample, when compared in the manner described inAppendix H. 12 Soluble lead If it is required to determine the soluble lead content of the material, this shall be done by the method desc
40、ribed inAppendix J.BS282, 389:1963 2 BSI 01-2000 Zinc chrome, Type 1 1 Scope and description This British Standard applies to zinc chromes which include in their composition chromates of alkali metals and are suitable for use in paints. The material shall be in the form of a dry soft powder or in su
41、ch condition that it may be readily reduced thereto by crushing under a palette knife, without necessitating any grinding action. 2 Composition The material shall be free from organic colours and lakes when tested by procedures b) and c) as described inAppendix A. After drying in the manner describe
42、d inAppendix C, it shall consist essentially of basic zinc chromate with chromates of alkali metals. 3 Sample For the purpose of examination representative samples shall be taken at random from not less than10per cent of the original and previously unopened containers. The material shall be thorough
43、ly mixed and shall then be divided into triplicate samples weighing not less than0.45kg (1lb) each. These shall be packed in clean, dry, air-tight, non-absorbent, opaque or dark glass containers on which the sample has no action. The containers shall be of such a size that they are nearly filled by
44、the sample. Each sample container so filled shall be sealed and shall be marked with full details and date of sampling. 4 Agreed sample Except where otherwise agreed between the purchaser and the vendor, the agreed sample referred to in Clauses7, 8 and9 shall be one and the same sample and shall com
45、ply in all other respects with the requirements of this specification. The sample shall weigh not less than0.45kg (1lb) and shall be packed in the manner specified in Clause3. 5 Residue on sieve The material shall not leave more than0.5per cent of residue when tested in the manner described inAppend
46、ix B. 6 Matter volatile at 100 C The loss in weight, on heating the material in the manner described inAppendix C shall not exceed1.5per cent. 7 Oil absorption value The oil absorption value of the material, determined in the manner described inAppendix E, shall be within 10per cent of the oil absor
47、ption value of the agreed sample. 8 Colour The colour of the material shall closely match that of the agreed sample, when compared in the manner described inAppendix F. 9 Staining power and colour on reduction The staining power of the material shall not be inferior to, and the colour on reduction s
48、hall closely match, that of the agreed sample, when compared in the manner described inAppendix H. 10 Freedom from impurities The material shall not contain more than0.5per cent by weight of matter insoluble in ammoniacal ammonium chloride solution, determined by the method described inAppendix L.BS
49、 282, 389:1963 BSI 01-2000 3 Zinc chrome, Type 2 1 Scope and description This British Standard applies to basic zinc potassium chromate of approximate composition K 2 CrO 4 , 3ZnCrO 4 , Zn(OH) 2 , suitable for use in paints. The material shall be in the form of a dry soft powder or in such condition that it may be readily reduced thereto by crushing under a palette knife, without necessitating any grinding action. 2 Composition The material shall be free from organic colours and lakes when tested by the procedures b) and c) described inAppendix A. After drying
