BS-303-1991 ISO-3710-1990.pdf

BRITISH STANDARD BS 303:1991 ISO 3710:1990 Specification for Lead chrome green pigments for paints Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 This British Standard, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 28 June 1991 © BSI 11-1999 First published July 1927 Second edition August 1938 Third edition April 1953 Fourth edition January 1965 Fifth edition June 1978 Sixth edition June 1991 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for comment 85/52820 DC ISBN 0 580 19742 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pigments, Paints and Varnishes Standards Policy Committee (PVC/-) to Technical Committee PVC/1, upon which the following bodies were represented: Aluminium Powder and Paste Association British Cement Association British Railways Board Chemical Industries Association Oil and Colour Chemists Association Paintmakers Association of Great Britain Ltd. Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 © BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Definition1 4Required characteristics and associated tolerances1 5Sampling1 6Determination of volatile matter1 7Test report2 Table 1 Essential requirements2 Table 2 Conditional requirements2 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 ii © BSI 11-1999 National foreword This revision of this British Standard has been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee. It is identical with ISO 3710:1990 “Lead chrome green pigments Specifications and methods of test”, published by the International Organization for Standardization (ISO). It supersedes BS 303:1978, which is withdrawn. The principal differences from the 1978 edition of BS 303 are as follows. a) The scope is now restricted to lead chrome green containing not more than 50 % (m/m) of an iron blue pigment. b) The original table is replaced by two tables: the first sets out essential requirements and the second sets out conditional requirements. c) The inclusion of an additional method for determination of volatile matter at 105 °C for 1 h. d) The method for the determination of total lead content has been removed. The Technical Committee has reviewed the provisions of ISO 2495:1972, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO 2495:1972 is BS 283:1965 “Specification for Prussian blues for paints”. Cross-references International StandardCorresponding British Standard ISO 787-1:1982 BS 3483 Methods for testing pigments for paints Part A1:1983 Comparison of colour (Identical) ISO 787-2:1981Part B6:1982 Determination of matter volatile at 105 °C ISO 787-4:1981Part C3:1982 Determination of acidity or alkalinity of the aqueous extract (identical) ISO 787-5:1980Part B7:1982 Determination of oil absorption value (Identical) ISO 787-7:1981Part B3:1982 Determination of residue on sieve (water method, using a manual procedure) (Identical) ISO 787-8:1979Part C2:1980 Determination of matter soluble in water (cold extraction method) (Identical) ISO 787-16:1986Part A4:1988 Determination of the relative tinting strength and colour on reduction of coloured pigment using visual comparison (Identical) ISO 787-20:1975Part B5:1974 Comparison of ease of dispersion (oscillatory shaking method) (Technically equivalent) ISO 842:1984BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) ISO 3711:1990BS 7446:1991 Specification for lead chromate pigments and lead chromate-molybdate pigments for paint (Identical) Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 © BSI 11-1999iii 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 from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 and 2, 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 table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 © BSI 11-19991 1 Scope This International Standard specifies the requirements and the corresponding methods of test for lead chrome green containing not more than 50 % (m/m) of an iron blue pigment. These pigments are suitable for general use. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 787-1:1982, General methods of test for pigments and extenders Part 1: Comparison of colour of pigments. ISO 787-2:1981, General methods of test for pigments and extenders Part 2: Determination of matter volatile at 105 °C. ISO 787-4:1981, General methods of test for pigments and extenders Part 4: Determination of acidity or alkalinity of the aqueous extract. ISO 787-5:1980, General methods of test for pigments and extenders Part 5: Determination of oil absorption value. ISO 787-7:1981, General methods of test for pigments and extenders Part 7: Determination of residue on sieve Water method Manual procedure. ISO 787-8:1979, General methods of test for pigments and extenders Part 8: Determination of matter soluble in water Cold extraction method. ISO 787-16:1986, General methods of test for pigments and extenders Part 16: Determination of relative tinting strength (or equivalent colouring value) and colour on reduction of coloured pigments Visual comparison method. ISO 787-20:1975, General methods of test for pigments Part 20: Comparison of ease of dispersion (Oscillatory shaking method). ISO 842:1984, Raw materials for paints and varnishes Sampling. ISO 2495:1972, Iron blue pigments for paints. ISO 3711:, Lead chromate pigments and lead chromate-molybdate pigments Specifications and methods of test1). 3 Definition For the purposes of this International Standard, the following definition applies. lead chrome green pigment a pigment produced either by precipitating lead chromate pigment on to an iron blue pigment dispersion or by mixing lead chromate pigments and iron blue pigments 4 Required characteristics and associated tolerances 4.1 Pigments complying with this International Standard shall not contain extenders or organic colouring matter; surface-active agents may be present. When produced by mixing pigments, the lead chromate pigment shall comply with ISO 3711 and the iron blue pigment with ISO 2495. 4.2 For lead chrome green pigments complying with this International Standard, the essential requirements are specified in Table 1 and the conditional requirements are listed in Table 2. The reference pigment and the conditional requirements listed in Table 2 shall be specified by agreement between the interested parties. 4.3 The agreed reference pigment shall comply with the requirements of Table 1. 5 Sampling Take a representative sample of the product to be tested, as described in ISO 842. 6 Determination of volatile matter For the determination of volatile matter, two methods are specified (A and B). Method A (6.1) shall be used as the referee method in cases of dispute. 6.1 Method A Determination at 60 °C for 16 h 6.1.1 Procedure Carry out the determination in duplicate. Into a weighing bottle of about 65 mm diameter weigh, to the nearest 1 mg, a test portion of the pigment such that, when the test portion is spread in a uniform layer, the depth of the layer does not exceed 5 mm. 1) To be published. (Revision of ISO 3711:1976) Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 2 © BSI 11-1999 Table 1 Essential requirements Table 2 Conditional requirements Heat the weighing bottle and contents for 16 h at 60 °C ± 2 °C. Cool in a desiccator containing active silica gel and reweigh. 6.1.2 Expression of results Calculate the volatile matter content VM of the pigment, expressed as a percentage by mass, using the equation If the two determinations differ by more than 10 % of the higher value, repeat the procedure. Calculate the mean of two valid determinations and report the result to the nearest 0,1 %. 6.2 Method B Determination at 105 °C for 1 h Carry out the determination by the method described in ISO 787-2, but heat the weighing bottle and contents for 1 h at 105 °C ± 2 °C only, without repeating the heating. 7 Test report The test report shall contain at least the following information: a) all details necessary for the identification of the product tested; b) a reference to this International Standard (ISO 3710); c) the methods used for the determination of volatile matter and total and soluble lead content; d) the results of the tests and whether or not the product complies with the relevant specification limits; e) any deviation from the methods of test specified; f) the date(s) of the tests. CharacteristicUnitRequirementMethod of test Volatile matter% (m/m)max. 3Clause 6 Matter soluble in water (cold-extraction method)% (m/m)max. 2 ISO 787-8, taking a test portion of 20 g Acidity or alkalinity of the aqueous extract ml of 0.1 mol/l solution per 100 g of pigment max. 20 ISO 787-4, taking a test portion of 20 g Residue on sieve (45 4m)% (m/m)max. 2ISO 787-7 CharacteristicUnitRequirementMethod of test ColourEqual to that of the agreed reference pigment (see 4.2) to within a tolerance agreed on between the interested parties ISO 787-1 Colour on reductionISO 787-16 Relative tinting strengthISO 787-16 Ease of dispersion Shall not be inferior to that of the reference pigment (see 4.2) ISO 787-20, measuring fineness of grind after 2,5 min, 5 min and thereafter every 5 min Oil absorption value Shall not differ by more than 15 % from the agreed value ISO 787-5 Total lead content, as Pb% (m/m) Shall not differ by more than 3 % (absolute) from the agreed value ISO 3711:1990 clause 6 Soluble-lead content as Pb in 0,07 mol/l HCl % (m/m) If required, to be agreed on between the interested parties ISO 3711:1990, clause 7 where m0is the mass, in grams, of the test portion; m1is the mass, in grams, of the weighing bottle and test portion before heating. m3is the mass, in grams, of the weighing bottle and test portion after heating. VM m1m2 m0 -100×= Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 © BSI 11-1999 Publication(s) referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:44:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 303:1991 ISO 3710:1990 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. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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