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1、BRITISH STANDARD BS EN ISO 787-3:1995 Incorporating Amendment No. 1 General methods of test for pigments and extenders Part 3: Determination of matter soluble in water Hot extraction method The European Standard EN ISO 787-3:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffi
2、eldun, na, Mon Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-3:1995 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 78/51275 DC ISBN 0 580 11539 9 Amendments issued since publication Amd. No.Date of issueComments 8510August 1995I
4、ndicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-3:1995 BSI 02-2000i Contents Page National forewordii Foreword2 Text of EN ISO 787-33 Publications referred toInside back cover Licensed Copy:
5、 sheffieldun sheffieldun, na, Mon Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-3:1995 ii BSI 02-2000 National foreword This revision of Part C1 of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with
6、 ISO 787-3 “General methods of test for pigments and extenders Part 3: Determination of matter soluble in water Hot extraction method” published in 1979 by the International Organization for Standardization (ISO). The 1974 edition of Part C1 is now withdrawn. In 1994 the European Committee for Stand
7、ardization (CEN) accepted ISO 787-3:1979 as European Standard EN ISO 787-3:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN ISO 787-3 and any reference to BS 3483-C1 should be read as a reference to BS EN ISO 787-3. Terminology and conventions
8、. 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 used a
9、s 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 3 of this International Standard” and “Part 8 of this International Standard” should be read as “Part C1 of this British Standard” and “Part C2 of this Bri
10、tish Standard” respectively. In clause 8 b) “International Standard (ISO 787-3)” should be read as “British Standard (BS 3483-C1)”. 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. Com
11、pliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 787-4aBS 3483 Methods for testing pigments for paints Part C3:1974 Determination of acidity or alkalinity of the aqueous extract (Techn
12、ically equivalent) ISO 787-8:1979Part C2:1980 Determination of matter soluble in water (cold extraction method) (Identical) ISO 842:1974BS 4726:1971 Methods for sampling raw materials for paints and varnishes (Technically equivalent) a Revision of ISO/R 787-4 in course of preparation. Summary of pag
13、es 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. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on
14、the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 787-3 March 1995 ICS 87.060.10 Descriptors: Paints, pigments, tests, chemical analysis, determination of content
15、, soluble matter, water, boiling water, extraction methods English version General methods of test for pigments and extenders Part 3: Determination of matter soluble in water Hot extraction method (ISO 787-3:1979) Mthodes gnrales dessai des pigments et matires de charge Partie 3: Dtermination des ma
16、tiers solubles dans leau Mthode par extraction chaud (ISO 787-3:1979) Allgemeine Prfverfahren fr Pigmente und Fllstoffe Teil 3: Bestimmung der wasserlslichen Anteile Heiextraktionsverfahren (ISO 787-3:1979) This European Standard was approved by CEN on 1994-10-17. CEN members are bound to comply wit
17、h 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-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretari
18、at 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 responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
19、versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Norma
20、lisation 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 means reserved in all countries to CEN and its members Ref. No. EN ISO 787-3:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mo
21、n Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-3:1995 BSI 02-2000 2 Foreword This European Standard has been taken over by the Technical Committee CEN/TC 298, Pigments and extenders, from the work of ISO/TC 35, Paints and varnishes, of the International Organization for Stan
22、dardization (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 September 1995, and conflicting national standards shall be withdrawn at the latest by September 1995. According to the CEN/CENE
23、LEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 0In
24、troduction3 1Scope and field of application3 2References3 3Reagent3 4Apparatus3 5Sampling3 6Procedure3 7Expression of results4 8Test report4 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-3:1995 BSI 02-20003 0 Introduction This d
25、ocument is a part of ISO 787, General methods of test for pigments and extenders. The first edition was published in July 1968 and subsequently work was carried out in an attempt to improve reproducibility. As a result of this work, it was found that three factors were of prime importance. The first
26、 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 to be able to fix reliable reproducibility limits but it is considered inappropriate to proceed further with the work. 1 Scope an
27、d field of application 1.1 Part 3 of this International Standard specifies a general method of test for determining the percentage by mass of matter soluble in boiling water, in a sample of pigment or extender. 1.2 Part 8 of this International Standard specifies a method for determining the percenta
28、ge by mass of matter soluble in water by cold extraction. For most pigments and extenders, these two test methods will 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. NOTEWhen thi
29、s 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, with a note of any detailed modification which may be needed in view of the special properties of the material in question.
30、 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 ISO 787, General methods of test for pigments and extenders Part 4: Determination of acidity or alkalinity of the aqueous ex
31、tract1). Part 8: Determination of matter soluble in water Cold extraction method. ISO 842, Raw materials for paints and varnishes Sampling. 3 Reagent Distilled water, fresh, double distilled or de-ionized water, of pH 6 to 7. NOTEOther water may be used but only by agreement between the interested p
32、arties. 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, glazed porcelain or silica. 4.4 Oven, capable of being mainta
33、ined 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 nearest 0,01 g, into a beaker. NOTEThe mass of the test portion us
34、ed 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 test portion mass shall be taken for repeat tests or for tests
35、 between different laboratories. 6.2 Determination Wet the test portion in the beaker with a few millilitres of the water (clause 3). (See note 1.) Add 200 ml of the water and stir. Unless a different period is specified for the material under test, boil the water for 5 min. A coagulating agent can
36、be used if the semi-colloidal nature of the material makes this desirable, provided that the agent selected is not such as to affect the subsequent determination of the acidity or alkalinity of the aqueous extract2), and provided that only the minimum quantity is used. Cool rapidly to room temperatu
37、re, 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 colloid 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 previou
38、sly weighed evaporating dish (4.3) on a water bath. (See note 2.) 1) In preparation. (Revision of ISO/R 787-4:1968.) 2) See ISO 787-4. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-3:1995 4 BSI 02-2000 Dry the residue in the eva
39、porating dish in the oven (4.4) at 105 2 C, cool in the desiccator (4.6) and 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 w
40、ater-soluble matter. NOTE 1If the material does not disperse easily in water, a wetting agent shall be used in the case of materials 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 ethy
41、lene oxide condensate should be used. If the wetting agent is non-volatile under the conditions of test, an appropriate correction derived from a blank test should be made. NOTE 2If required, the time between the end of the boiling and the beginning of the filtration should be specified and indicate
42、d in the test report. 7 Expression of results The water-soluble matter (hot 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 place. 8 Test report The test report shall contain at least the fo
43、llowing information: a) the type and identification of the product tested; b) a reference to this International Standard (ISO 787-3); c) the result of the test as indicated in clause 7; d) the mass of the test portion used; e) any deviation, by agreement or otherwise, from the procedure specified, p
44、articularly 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 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787
45、-3:1995 BSI 02-2000 Publications referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-3:1995 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent nation
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