BS 4313-1988 Specification for strontium chromate pigments for paints《涂料用铬酸锶颜料规范》.pdf
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1、BRITISH STANDARD BS4313:1988 ISO2040:1972 Specification for Strontium chromate pigments for paints ISO title: Strontium chromate pigments for paints UDC 667.662:661.843:661.875.27:620.1.113BS4313:1988 This BritishStandard, having been prepared under the directionof the Pigments, Paintsand Varnishes
2、StandardsCommittee, was published under the authorityofthe Board of BSI andcomes into effect on 30November1988 BSI12-1999 First published April1968 First revision The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for comment76/50335 DC ISBN 0 580 16979
3、 0 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Pigments, Paints and Varnishes Standards Committee (PVC/-) to Technical Committee PVC/1 upon which the following bodies were represented: Aluminium Powder and Paste Association British Col
4、our Makers Association British Precast Concrete Federation Ltd. Cement Makers Federation Chemical Industries Association Oil and Colour Chemists Association Paintmakers Association of Great Britain Ltd. Red Lead and Litharge Manufacturers Association Titanium Pigment Manufacturers Technical Committe
5、e Amendments issued since publication Amd. No. Date of issue CommentsBS4313:1988 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 References 1 3 Required characteristics and their tolerances 1 4 Sampling 1 5 Methods of te
6、st 1 Table Required characteristics and their tolerances 2 Publications referred to Inside back coverBS4313:1988 ii BSI 12-1999 National foreword This BritishStandard has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO2040:1972 “S
7、trontium chromate pigments for paints” published by the International Organization for Standardization (ISO) and confirmed in1985. This revision supersedes BS4313:1968 which is withdrawn. BS4313 was first published in1968 and this first revision brings the standard in line with international agreeme
8、nts by implementing the International Standard as an identical BritishStandard. The main differences from the1968 edition of this BritishStandard are as follows: a) the requirement for total chromate content has been reduced; b) the requirement for soluble chromate content has been reduced; c) the s
9、ieve residue is carried out only by the water method. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in BritishStandar
10、ds; attention is drawn especially to the following. The comma has been used as a decimal marker. In BritishStandards it is current practice to use a full point on the baseline as the decimal marker. The symbol “l” has been used to denote litre (and in its submultiples). In BritishStandards it is cur
11、rent practice to use the symbol “L”. Wherever the words “International Standard” appear, referring to this standard, they should be read as “BritishStandard”. The Technical Committee has reviewed the provisions of ISO/R787-X 1) , to which reference is made in the text, and has decided that they are
12、acceptable for use in conjunction with this standard. A related BritishStandard to ISO787-10 is BS3483 “Methods for testing pigments for paints” Part B8:1982 “Determination of density (pyknometer method)”. Since the publication of ISO2040, ISO787-VI has been withdrawn and the Technical Committee has
13、 reviewed the position and decided that for the purposes of this standard it is acceptable that only the sieve analysis by the water method given in ISO/R787-VII 2)should apply. Cross-references International Standard Corresponding BritishStandard BS3483 Methods for testing pigments for paints ISO78
14、7-2:1981 a Part B6:1982 Determination of matter volatile at105 C (Identical) ISO787-5:1980 b Part B7:1982 Determination of oil absorption value (Identical) ISO787-7:1981 c Part B3:1982 Determination of residue on sieve (water method, using a manual procedure) (Identical) ISO842:1984 d BS4726:1986 Me
15、thods for sampling raw materials for paints and varnishes (Identical) a Referred to in the text as ISO/R787-II. b Referred to in the text as ISO/R787-V. c Referred to in the text as ISO/R787-VII. d Referred to in the text as ISO/R842. 1) Now published as ISO787-10:1981. 2) Now published as ISO787-7:
16、1981BS4313:1988 BSI 12-1999 iii Additional information. In clause5, water complying with grade3 of BS3978 is suitable. For the hydrochloric acid solution specified in5.1.1 and5.3.3.1, and the sulphuric acid specified in5.3.4.2, the density unit is grams per millilitre. The concentrations of a number
17、 of volumetric solutions are given as obsolete normalities and molarities. The concentrations in SIunits are as follows. 0.1N Sodium thiosulphate: c(Na 2 S 2 O 3 )=0.1mol/L 2N Hydrochloric acid: c(HCl)=2mol/L 1M Potassium iodide: c(KI)=1mol/L 0.1N Silver nitrate: c(AgNO 3 )=0.1mol/L 5N Sulphuric aci
18、d: c(H 2 SO 4 )=2.5mol/L 4N Sodium hydroxide: c(NaOH)=4mol/L. 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 Standard does not of itself confer immunity fro
19、m legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, pages1to4, an inside back cover 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 ta
20、ble on the inside front cover.iv blankBS4313:1988 BSI 12-1999 1 1 Scope and field of application This International Standard lays down the requirements and test methods for strontium chromate pigments of approximate composition SrCrO 4suitable for use in paints and corrosion-inhibiting coatings. 2 R
21、eferences ISO/R787, General methods of test for pigments. ISO/R842, Sampling raw materials for paints and varnishes. 3 Required characteristics and their tolerances Strontium chromate pigments for paints shall have the characteristics shown in the Table below. 4 Sampling A representative sample of t
22、he pigment shall be taken in accordance with ISO/R842. 5 Methods of test All reagents used shall be of recognized analytical reagent quality. Distilled water or water of at least equivalent purity shall be used. 5.1 Determination of strontium content 5.1.1 Reagents 1) Acetic acid,10%(V/V) solution.
23、2) Hydrochloric acid, d =1.18. 3) Sulphuric acid,50g/l solution. 4) Sulphamic acid 5) Ethanol,95%(V/V). 5.1.2 Apparatus Sintered silica crucible, porosity P16 (maximum pore size10 to16m). 5.1.3 Procedure 5.1.3.1 Test portion Weigh, to the nearest0.1mg, about0.25g of the sample. 5.1.3.2 Determination
24、 Transfer the test portion into a500ml glass-stoppered flask. Add50ml of acetic acid1) and shake or stir for1h at room temperature in such a manner that the pigment is kept in continuous suspension without increasing the temperature of the extracting liquid. Filter the solution through an ash-free c
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