《BS-EN-ISO-787-8-1995.pdf》由会员分享，可在线阅读，更多相关《BS-EN-ISO-787-8-1995.pdf（10页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN ISO 787-8:1995 Incorporating Amendment No. 1 General methods of test for pigments and extenders Part 8: Determination of matter soluble in water Cold extraction method The European Standard EN ISO 787-8:1995 has the status of a British Standard Licensed Copy: sheffieldun sheff
2、ieldun, na, Mon Nov 20 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-8:1995 This British Standard, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee, was published under the authority of the Executive Board and comes into effect on
3、 31 July 1980 BSI 03-2000 First published March 1974 First revision July 1980 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for comment 78/51276 DC ISBN 0 580 11538 0 Amendments issued since publication Amd. No.Date of issueComments 8511August 1995
4、Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-8:1995 BSI 03-2000i Contents Page National forewordii Foreword2 Text of EN ISO 787-83 Publications referred toInside back cover Licensed Copy
5、: sheffieldun sheffieldun, na, Mon Nov 20 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-8:1995 ii BSI 03-2000 National foreword This revision of Part C2 of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical wit
6、h ISO 787-8 “General methods of test for pigments and extenders Part 8: Determination of matter soluble in water Cold extraction method” published in 1979 by the International Organization for Standardization (ISO). The 1974 edition of Part C2 is now withdrawn. In 1994 the European Committee for Sta
7、ndardization (CEN) accepted ISO 787-8:1979 as European Standard EN ISO 787-8:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN ISO 787-8 and any reference to BS 3483-C2 should be read as a reference to BS EN ISO 787-8:1995. Terminology and conv
8、entions. The text of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been
9、 used as a decimal marker. In British Standards it is current practice to use a full point on the base line as the decimal marker. In 1.1 and 1.2 “Part 8 of this International Standard” and “Part 3 of this International Standard” should be read as “Part C2 of this British Standard” and “Part C1 of t
10、his British Standard” respectively. In clause 8 b) “International Standard (ISO 787-8)” should be read as “British Standard (BS 3483-C2)”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicati
11、on. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 787-3:1979BS 3483 Methods for testing pigments for paints Part C1:1980 Determination of matter soluble in water (hot extraction
12、method) (Identical) ISO 842:1974BS 4726:1971 Methods for sampling raw materials for paints and varnishes (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 to 4, an inside back cover and a back cover.
13、 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, Mon Nov 20 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME E
14、UROPENNE EUROPISCHE NORM EN ISO 787-8 March 1995 ICS 87.060.10 Descriptors: Paints, pigments, tests, chemical analysis, determination of content, soluble matter, water, extraction method English version General methods of test for pigments and extenders Part 8: Determination of matter soluble in wat
15、er Cold extraction method (ISO 787-8:1979) Mthodes gnrales dessai des pigments et matires de charge Partie 8: Dtermination des matires solubles dans leau Mthode par extraction froid (ISO 787-8:1979) Allgemeine Prfverfahren fr Pigmente und Fllstoffe Teil 8: Bestimmung der wasserlslichen Anteile Kalte
16、xtraktionsverfahren (ISO 787-8:1979) This European Standard was approved by CEN on 1994-10-17. 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 standard without any alteration. Up-to-da
17、te lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the
18、 responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
19、Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any
20、means reserved in all countries to CEN and its members Ref. No. EN ISO 787-8:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-8:1995 BSI 03-2000 2 Foreword This European Standard has been taken over by the Technical Committe
21、e CEN/TC 298, Pigments and extenders, from the work of ISO/TC 35, Paints and varnishes, of the International Organization for Standardization (ISO). This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by
22、 September 1995, and conflicting national standards shall be withdrawn at the latest by September 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Irel
23、and, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 0Introduction3 1Scope and field of application3 2References3 3Reagent3 4Apparatus3 5Sampling3 6Procedure3 7Expression of results4 8Test report4 Licensed Copy: sheffieldun she
24、ffieldun, na, Mon Nov 20 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-8:1995 BSI 03-20003 0 Introduction This document is a part of ISO 787, General methods of test for pigments and extenders. The first edition was published in June 1970 and subsequently work was carried out in an
25、attempt to improve reproducibility. As a result of this work, it was found that three factors were of prime importance. The first was the type of water used, the second was the type of filter used and the third was the mass of the test portion. Unfortunately insufficient tests have been carried out
26、to be able to fix reliable reproducibility limits but it is considered inappropriate to proceed further with the work. 1 Scope and field of application 1.1 Part 8 of this International Standard specifies a general method of test for determining the percentage by mass of matter soluble in cold water,
27、 in a sample of pigment or extender. 1.2 Part 3 of this International Standard specifies a method for determining the percentage by mass of matter soluble in water by hot extraction. For most pigments and extenders, these two test methods will give different results, and it is therefore essential to
28、 state clearly in a specification which method is to be used, and in the test report which method has been used. NOTEWhen this general method is applicable to a given pigment or extender, only a cross-reference to it need be included in the International Standard relating to that pigment or extender
29、, with a note of any detailed modification which may be needed in view of the special properties of the material in question. Only when neither of these general methods is applicable to a particular material should a special method for determination of water-soluble matter be specified. 2 References
30、 ISO 787, General methods of test for pigments and extenders Part 3: Determination of matter soluble in water Hot extraction method. ISO 842, Raw materials for paints and varnishes Sampling. 3 Reagent Distilled water, fresh, double distilled and cooled, or deionized water, of pH 6 to 7. NOTEOther wa
31、ter may be used but only by agreement between the interested parties. 4 Apparatus 4.1 One-mark volumetric flask, of capacity 250 ml. 4.2 Colloid filter NOTEOther types of filter may be used but only by agreement between the interested parties. 4.3 Evaporating dish, flat-bottomed, of glass, platinum,
32、 glazed porcelain or silica. 4.4 Oven, capable of being maintained at 105 2 C. 4.5 Balance, accurate to 1 mg or better. 4.6 Desiccator 5 Sampling Take a representative sample of the material to be tested as described in ISO 842. 6 Procedure 6.1 Test portion Weigh 2 to 20 g of the sample, to the near
33、est 0,01 g, into a beaker. NOTEThe mass of the test portion used shall be chosen according to the type of the material and to the amount of water-soluble matter in the material. This is particularly important for materials that contain large amounts of matter soluble in water. In any case, the same
34、test portion mass shall be taken for repeat tests or for tests between different laboratories. 6.2 Determination Wet the test portion in the beaker with a few millilitres of the water (clause 3). NOTEIf the material does not disperse easily in water, a wetting agent should be used. In the case of ma
35、terials not soluble in ethanol, 5 ml of ethanol may be used; in the case of pigments soluble in ethanol, a non-ionic wetting agent such as 10 ml of a 0,01 % solution of a ethylene oxide condensate should be used. If the wetting agent is non-volatile under the conditions of test, an appropriate corre
36、ction derived from a blank test should be made. Add 200 ml of the water (cooled to room temperature) and stir continuously for 1 h at room temperature. Transfer to the volumetric flask (4.1) and dilute to the mark with the water. Mix thoroughly by shaking and inversion, and filter through the colloi
37、d filter (4.2), returning the filtrate to the filter until it runs clear. Evaporate 100 ml of the perfectly clear filtrate to dryness in the previously weighed evaporating dish (4.3) on a water bath. Dry the residue in the evaporating dish in the oven (4.4) at 105 2 C, cool in the desiccator (4.6) a
38、nd weigh to the nearest 1 mg. Repeat the heating and cooling until the results of the two last weighings, at an interval including at least 30 min heating, do not differ by more than 10 % of the final figure obtained for the water-soluble matter. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 2
39、0 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-8:1995 4 BSI 03-2000 7 Expression of results The water-soluble matter (cold extraction method), expressed as a percentage by mass, is given by the formula where Take the mean of two determinations and report the result to one decimal p
40、lace. 8 Test report The test report shall contain at least the following information: a) the type and identification of the product tested; b) a reference to this International Standard (ISO 787-8); c) the result of the test as indicated in clause 7; d) the mass of the test portion used; e) any devi
41、ation, by agreement or otherwise, from the procedure specified, particularly any details of the filter and the water used; f) the date of the test. m0is the mass, in grams, of the test portion; m1is the mass, in grams, of residue. 250 m1 m0 - - Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20
42、02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-8:1995 BSI 03-2000 Publications referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-8:1995 BSI 389 Chiswick High Road London W4 4A
43、L 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.
44、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. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Sec
45、retary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Bu
46、ying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published
47、 as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which
48、 give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other bene
49、fits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. Thi