1、BS EN ISO787-7:2009ICS 87.060.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDGeneral methods oftest for pigments andextendersPart 7: Determination of residue onsieve Water method Manualprocedure (ISO 787-7:2009)This British Standard was published under the au
2、thority of the Standards Policy and Strategy Committee on 30 November 2009. BSI 2009ISBN 978 0 580 63618 9Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 787-7:2009National forewordThis British Standard is the UK implementation of EN ISO 787-7:2009.It supersedes BS 3483-B3:1982
3、which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/1, Pigments.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. User
4、s are responsible for its correct application. Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 787-7 October 2009 ICS 87.060.10 English Version General methods of test for pigments and extenders - Part 7: Determ
5、ination of residue on sieve - Water method - Manual procedure (ISO 787-7:2009) Mthodes gnrales dessai des pigments et matires de charge - Partie 7: Dtermination du refus sur tamis - Mthode leau - Mthode manuelle (ISO 787-7:2009) Allgemeine Prfverfahren fr Pigmente und Fllstoffe - Teil 7: Bestimmung
6、des Siebrckstandes - Wasserverfahren - Handsplverfahren (ISO 787-7:2009) This European Standard was approved by CEN on 5 October 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national s
7、tandard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any ot
8、her language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estoni
9、a, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPI
10、SCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 787-7:2009: EBS EN ISO 787-7:2009EN ISO 787-7:2009 (E) 3 Foreword This document (EN ISO 787-7:20
11、09) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee CEN/TC 298 “Pigments and extenders” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an id
12、entical text or by endorsement, at the latest by April 2010, and conflicting national standards shall be withdrawn at the latest by April 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held r
13、esponsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, F
14、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 787-7:2009 has been approved by CEN as a EN ISO 78
15、7-7:2009 without any modification. BS EN ISO 787-7:2009ISO 787-7:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Sampling.1 4 Apparatus.2 5 Procedure.2 6 Expression of results3 7 Test report4 Annex A (normative) Mechanical stirrer.5 BS EN ISO 787-
16、7:2009ISO 787-7:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees.
17、 Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Interna
18、tional Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Stan
19、dards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subje
20、ct of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 787-7 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 2, Pigments and extenders. This second edition cancels and replaces the first edition (ISO 787-7:1981),
21、 which has been technically revised. The main technical changes are: a) the apparatus clause has been amended; b) a number of modifications have been made to the determination. ISO 787 consists of the following parts, under the general title General methods of test for pigments and extenders: Part 1
22、: Comparison of colour of pigments Part 2: Determination of matter volatile at 105 C Part 3: Determination of matter soluble in water Hot extraction method Part 4: Determination of acidity or alkalinity of the aqueous extract Part 5: Determination of oil absorption value Part 7: Determination of res
23、idue on sieve Water method Manual procedure Part 8: Determination of matter soluble in water Cold extraction method Part 9: Determination of pH value of an aqueous suspension Part 10: Determination of density Pyknometer method Part 11: Determination of tamped volume and apparent density after tampin
24、g Part 13: Determination of water-soluble sulfates, chlorides and nitrates Part 14: Determination of resistivity of aqueous extract BS EN ISO 787-7:2009ISO 787-7:2009(E) ISO 2009 All rights reserved v Part 15: Comparison of resistance to light of coloured pigments of similar types Part 16: Determina
25、tion of relative tinting strength (or equivalent colouring value) and colour on reduction of coloured pigments Visual comparison method Part 17: Comparison of lightening power of white pigments Part 18: Determination of residue on sieve Mechanical flushing procedure Part 19: Determination of water-s
26、oluble nitrates (Salicylic acid method) Part 21: Comparison of heat stability of pigments using a stoving medium Part 22: Comparison of resistance to bleeding of pigments Part 23: Determination of density (using a centrifuge to remove entrained air) Part 24: Determination of relative tinting strengt
27、h of coloured pigments and relative scattering power of white pigments Photometric methods Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments Colorimetric method Parts 6, 12 and 20 have been withdrawn. BS EN ISO 787-7:2009BS EN ISO 787-7:2009INTERNATIONAL
28、 STANDARD ISO 787-7:2009(E) ISO 2009 All rights reserved 1General methods of test for pigments and extenders Part 7: Determination of residue on sieve Water method Manual procedure 1 Scope This part of ISO 787 specifies a general method of test for determining the residue on sieve from a sample of p
29、igment or extender dispersed in water. ISO 787-18, General methods of test for pigments and extenders Part 18: Determination of residue on sieve Mechanical flushing procedure, specifies a general method of test for determining the residue on sieve from a sample of pigment or extender by a mechanical
30、 flushing procedure. For most pigments and extenders, ISO 787-7 and ISO 787-18 will usually give different results, and it is therefore essential to state clearly in a specification which method is to be used and, in the test report, which method has been used. NOTE The general methods given in the
31、various parts of ISO 787 are usually applicable to any pigment or extender. Thus only a cross-reference to the appropriate part of ISO 787 needs to be included in the International Standard giving the specification for that pigment or extender, indicating any detailed modifications that may be neede
32、d in view of the special properties of the material in question. Only when the general methods are not applicable to a particular material should a different method for determination of residue on sieve be specified. 2 Normative references The following referenced documents are indispensable for the
33、 application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 565, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openin
34、gs ISO 3262-9:1997, Extenders for paints Specifications and methods of test Part 9: Calcined clay ISO 4793, Laboratory sintered (fritted) filters Porosity grading, classification and designation ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling 3 Sampling Take a repres
35、entative sample of the material to be tested, as described in ISO 15528. BS EN ISO 787-7:2009ISO 787-7:2009(E) 2 ISO 2009 All rights reserved4 Apparatus Use ordinary laboratory apparatus and glassware, together with the following: 4.1 Sieve, of nominal mesh aperture as required, complying with the r
36、equirements of ISO 565. The nominal mesh aperture and the diameter of the sieve used shall be stated in the test report. Sieves of nominal mesh aperture 45 m are frequently used. It is recommended that the mesh apertures of the sieve be periodically examined, using a microscope, to establish that bl
37、ockage or undue wear has not occurred. The sieve should be discarded if the mesh apertures have been affected. 4.2 Brush, hog bristle, approximate dimensions 5 mm thick, 20 mm wide and 35 mm long. 4.3 Sintered-glass crucible, of porosity grade P 40 (pore size index 16 m to 40 m) as defined in ISO 47
38、93, or 50 ml beaker. 4.4 Oven, capable of being maintained at (105 2) C. 4.5 Balance, capable of weighing up to 1 000 g to the nearest 0,1 g. 4.6 Balance, capable of weighing to the nearest 1 mg. 4.7 Desiccator, containing an efficient desiccant. 4.8 Washbottle, to contain the solution used to dispe
39、rse the test portion. 5 Procedure 5.1 General Carry out the determination in duplicate. 5.2 Test portion Using balance 4.5, weigh, to the nearest 0,1 g, into a beaker of suitable capacity, a quantity of the sample such that a sufficient residue on the sieve (4.1) is obtained. Generally, a test porti
40、on of 10 g to 100 g is necessary but, in the case of products yielding a very low residue on the sieve, a larger test portion, up to 1 000 g, should be used. 5.3 Preparation of the dispersion Disperse the test portion (see 5.2) in a suitable volume of water (about 300 ml to 600 ml) containing, if re
41、quired, a suitable dispersing agent (see, however, the second and third paragraphs below). If the product specification advises that mechanical assistance is commonly required to achieve thorough dispersion, a stirrer and stirrer head as specified in ISO 3262-9:1997, Subclause 6.3.4 (see Annex A), s
42、hall be used, and it is recommended that the rotation of the stirrer should not exceed (500 50) min1. The use of a mechanical stirrer shall be stated in the test report. If agreed between the interested parties, the test portion may be transferred directly to the sieve, without previous dispersion.
43、The quantity of the dispersing agent should preferably be between 0,2 % and 0,5 % of the mass of the test portion. The type and quantity of the dispersing agent to be used shall be agreed between the interested parties and indicated in the test report. It is important that the dispersion of the pigm
44、ent or extender in the aqueous medium be thorough and that no flocculation should occur during the determination (see 5.4). BS EN ISO 787-7:2009ISO 787-7:2009(E) ISO 2009 All rights reserved 35.4 Determination Pour the dispersion, if necessary in portions, through the sieve (4.1). With the aid of a
45、washbottle (4.8) filled with the solution used to disperse the test portion, rinse out the beaker and pour all the rinsings through the sieve. Wash the test portion with the same solution until the washings passing through the sieve are clear and free of dispersed material. When the test portion has
46、 simply been dispersed in water, tap water from a sprinkling rose may be used for rinsing. Depending on previous agreement between the interested parties, either break up pigment agglomerates on the sieve by application of gentle pressure using a brush (4.2) or leave such agglomerates untreated. If
47、a brush is used, wash any particles adhering to the brush onto the sieve and wash the residue on the sieve with water to free it from dispersing agent. In order to avoid false test results, the water should preferably be filtered. Treat the residue on the sieve in accordance with one of the followin
48、g alternative procedures: a) Wash the residue with distilled water into a previously heated and weighed sintered-glass crucible (4.3), allow the water to filter through and dry the residue in the oven (4.4) at (105 2) C for 1 h. Allow to cool in the desiccator (4.7) and weigh to the nearest 1 mg. Us
49、e balance 4.6 for these weighings. Calculate the mass of the residue. b) Transfer the residue with distilled water into a previously heated and weighed 50 ml beaker. Evaporate the water and dry in the oven at (105 2) C for 1 h. Continue as described under a) above. If the melting point of the residue on the sieve is lower than 110 C, a more suitable drying temperature shall be used and this shall be stated in the test report. If the two deter
