1、BRITISH STANDARD General methods of test for pigments and extenders - Part 8: Determination of matter soluble in water - Cold extraction method The European Standard EN IS0 787-8:2000 has the status of a British Standard ICs 87.060.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGH
2、T LAW BS EN IS0 787-8:2001 Incorpo?-ating Corrigenda Nos. 1 ad 2 BS EN IS0 787-8:2001 Amd No. 13082 National foreword Date Comments March 2001 This British Standard is the oficial English ianguage version of EN IS0 7878:2000 including conigenduni November 2000. It is identical with IS0 787-8:2000. I
3、t supersedes BS EN IS0 787-8: 1995 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STYl, Pigments, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationaVEhmpean committee any enquiries on th
4、e interpretation, or proposals for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Atention is drawn
5、 to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponing European publications. The British Standards which implement these international or European Publications may be found in the BSI Standards Cat
6、alogue under the section entitled “international Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Caaogue. A British Sandard does not purport to include ail the necessary provisions of a conkact. Users of British Standards are responsible for their cor
7、rect 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, the EN IS0 title page, the EN IS0 foreword page, the IS0 title page, pages U to iv, pages 1 to 3, the annex Z
8、A page, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. This British Standard, having been prepared under the direction of the Sector Committee for Materiais and Chemicals, was published under the authority of th
9、e Standards Committee and comes into effect on 15 January 2001 o w15 October 2001 Amendments issued since publication 13421 I 5 October 2001 Incorporating annex ZA, correction page 1 ISBN O 680 36855 6 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 787-8 October 2000 ICs 08.006.10 English
10、version Supersedes EN IS0 787-8:1995 Incorporating corrigendum November 2000 General methods of test for pigments and extenders - Part 8: Determination of matter soluble in water - Cold extraction method (IS0 787-82000) Mthodes gnrales dessai des pigments et matires de charge - Partie 8: Dterminatio
11、n des matires solubles dans leau - Mthode par extraction froid (IC0 787-8:2000) Allgemeine Prfverfahren fr Pigmente und Fllstoffe - Teil 8: Bestimmung des wasserlslichen Anteile - Kaltextraktionsverahren (IS0 787-8:2000) This European Standard was approved by CEN on 1 October 2000. CEN members are b
12、ound to comply with the CENKENELEC 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
13、Management Centre 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 Management Centre has the same status as
14、the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway. Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATIO
15、N EUROPISCHES KOMITEE FOR NORMUNG COMITE EUROPEEN DE NORMALISATION Management Centre: rue de Stassart, 36 8-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 787-8:2000 E Page 2 EN IS0 787-8:ZOOO I CORRECTED
16、2001-04-11 I Foreword The text of the International Standard IS0 787-8:2000 has been prepared by Technical Committee ISOTTC 35 “Paints and varnishes“ in collaboration with Technical Committee CENKC 298 “Pigments and extenders“, the secretariat of which is held by DIN. This European Standard supersed
17、es EN IS0 787-8:1995. 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 April 2001, and conflicting national standards shall be withdrawn at the latest by April 2001. According to the CENICENELEC In
18、ternal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerla
19、nd and the United Kingdom. Endorsement notice The text of the International Standard IS0 787-8:2000 was approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards are listed in annex ZA (normative). INTERNATIONAL STANDARD EN IS0 787-8:2000
20、IS0 787-8 Second edition 2000-1 0-0 I General methods of test for pigments and extenders - Part 8: Determination of matter soluble in water - Cold extraction method Mthodes gnrales dessai des pigments et matires de charge - Partie 8: Dtermination des matires solubles dans leau - Mthode par extractio
21、n froid Reference number IS0 787-8:2000(E) EN IS0 787-8:ZOOO ii EN IS0 787-8:2000 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out throug
22、h IS0 technical committees. 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. IS0 collaborat
23、es closely with the International 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 3. Draft International Standards adopted by the technical committees are circ
24、ulated 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 part of IS0 787 may be the subject of patent rights. IS0 shall not be held
25、responsible for identifying any or all such patent rights. International Standard IS0 787-8 was prepared by Technical Committee ISOTTC 35, Paints and varnishes, Subcommittee SC 2, Pigments and extenders. This second edition cancels and replaces the first edition (IS0 787-8:1979), which has been tech
26、nically revised. IS0 787 consists of the following parts, under the general title General methods of test for pigments and extenders : - Part 1: Comparison of colour of pigments - Part 2: Determination of matter volatile at 105 “C - Part 3: Determination of matter soluble in water - Hot extraction m
27、ethod - Part 4: Determination of acidity or alkalinity of the aqueous extract - Part 5: Determination of oil absorption value - Part 7: Determination of residue on sieve - Water method - Manual procedure - Part 8: Determination of matter soluble in water - Cold extraction method - Part 9: Determinat
28、ion of pH value of an aqueous suspension - Part IO: Determination of density - Pyknometer method - Part 11: Determination of tamped volume and apparent density after tamping - Part 13: Determination of water-soluble sulphates, chlorides and nitrates - Pari 14: Determination of resistivity of aqueous
29、 extract - Part 15: Comparison of resistance to light of coloured pigments of similar types - Part 16: Determination of relative tinting strength (or equivalent colouring value) and colour on reduction of coloured pigments - Visual comparison method . 111 EN IS0 787-8:ZOOO - Part 17: Comparison of l
30、ightening power of white pigments - Part 18: Determination of residue on sieve - Mechanical flushing procedure - Pari 19: Determination of water-soluble nitrates (Salicylic acid method) - Part 21: Comparison of heat stability of pigments using a stoving medium - Part 22: Comparison of resistance to
31、bleeding of pigments - Part 23: Determination of density (using a centrifuge to remove entrained air) - Part 24: Determination of relative tinting strength of coloured pigments and relative scattering power of white pigments - Photometric methods - Part 25: Comparison of the colour, in full-shade sy
32、stems, of white, black and coloured pigments - Colorimetric method - Part 26: Determination of relative tinting strength and residual colour difference of colorants - Weighted US value method iv EN IS0 787-8:2001 General methods of test for pigments and extenders - Part 8: Determination of matter so
33、luble in water - Cold extraction method 1 Scope This part of IS0 787 specifies a general method of test for determining the percentage by mass of matter soluble in cold water, in a sample of pigment or extender. IS0 787-3 specifies a method for determining the percentage by mass of matter soluble in
34、 water by hot 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. NOTE The general methods given in the variou
35、s parts of IS0 787 are usually applicable to any pigment or extender. Thus only a cross-reference to the appropriate part of IS0 787 needs to be included in the International Standard giving the specification for that pigment or extender, indicating any detailed modification that may be needed in vi
36、ew of the special properties of the material in question. Only when the general methods are not applicable to a particular material is a different method for determination of water-soluble matter to be specified. 2 Normative references The following normative documents contain provisions which, thro
37、ugh reference in this text, constitute provisions of this part of IS0 787. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IS0 787 are encouraged to investigate the possibility of applying t
38、he most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of currently valid International Standards. IS0 787-3:2000, General methods of test for pigments and
39、 extenders - Part 3: Determination of matter soluble in water - Hot extraction method. IS0 1042:1998, Laboratory glassware - One-mark volumetric flasks. IS0 15528:2000, Paints, varnishes and raw materials for paints and varnishes - Sampling. 3 Reagent 3.1 Water, freshly double-distilled or de-ionize
40、d, of pH 6 to 7. Other types of water may be used but only by agreement between the interested parties. 4 Apparatus 4.1 One-mark volumetric flask, of capacity 250 ml, complying with the requirements of IS0 1042. 1 EN IS0 787-3:2000 4.2 Membrane filter. Other types of filter may be used but only by a
41、greement between the interested parties. 4.3 Evaporating dish, flat-bottomed, of glass, platinum, glazed porcelain or silica, dried to constant mass. 4.4 Water bath. 4.5 Oven, capable of being maintained at (105 I2) “C. 4.6 4.7 Balance, accurate to 1 mg or better. Desiccator, containing an efficient
42、 desiccant. 5 Sampling Take a representative sample of the material to be tested, as described in IS0 15528. 6 Procedure 6.i General Carry out the determination in duplicate. 6.2 Test portion Weigh, to the nearest 0,Ol g, 2 g to 20 g of the sample (mo) into a beaker. The mass of the test portion use
43、d shall be chosen according to the type of material and 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 carrie
44、d out in several different laboratories. 6.3 Determination Moisten the test portion in the beaker with a few millilitres of water (3.1). If the material does not disperse easily in water, use a wetting agent. In the case of materials which are not soluble in ethanol, an appropriate volume of ethanol
45、 may be added; in the case of pigments soluble in ethanol, use a non- ionic wetting agent such as 10 ml of a 0,Ol % solution of an ethylene oxide condensate. If the wetting agent is non- volatile under the conditions of test, an appropriate correction derived from a blank test shall be made. Add 200
46、 ml of water (3.1) (cooled to room temperature) and stir continuously for 1 h at room temperature. Transfer the solid and the liquid to the volumetric flask (4.1) and dilute to the mark with water (3.1). Mix thoroughly by shaking and inverting, and filter immediately through the membrane filter (4.2
47、), returning the filtrate to the filter until it runs clear. Suspensions which are difficult to filter shall be centrifuged. Pipette 100 ml of the perfectly clear filtrate or centrifugate into a previously dried and weighed evaporating dish (4.3) and then evaporate on the water bath (4.4). Dry the r
48、esidue in the evaporating dish in the oven (4.5) at (105 +2) “C, cool in the desiccator (4.7) 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 weig
49、hing. From the lower of the last two weighings, calculate and record the mass of the residue (rn,). 2 EN IS0 787-8:2000 7 Expression of results 7.1 Calculation Calculate the water-soluble matter (cold extraction method), Mw,c, expressed as a percentage by mass, using the equation where mo is the mass, in grams, of the test portion; ml is the mass, in grams, of the residue. If the two results do not differ by more than 10 % of the lower value, calculate and report the arithmetic mean. If the difference exceeds 10 %, carry out a third determination and report
