1、- CEN EN*IS0*787-9 95 3YOY589 OLLLL29 7LT I A BRITISHSTANDARD General methods of test for pigments and extenders Part 9. Determination of pH value of aqueous suspension The European standard EN Is0 787-9 : 1995 has the status of a British Standard BS EN IS0 787-9 : 1995 CEN EN*IS0*787-9 95 E3 340458
2、9 O11L130 431 F National foreword This revision of Part C4 of BS 3483 has been prepared under the direction of the Pigments. Paints and Varnishes Standads Committee. It is identical with IS0 787/9 General methods of test for pigments and extenders - Part 9 : Determination of pH value of an aqueous s
3、uspension published in 1981 by the International Organization for Standardization (ISO). Ln 1994theEuropeancOmmitteeforsQndardization(CEN)acceptediso7:1981 as European standard ENiS74: 1995. As a comace of impiementhg the European standard this British Stanard is renumbered as BsENISO787-9 and any r
4、eference to EIS 3483 : Part C4 should be read as a reference to BS EN Is0 787-9. This Part of BS 3483 supersedes BS 3483 : Part C4 : 1974 which is withdrawn. Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Standard withou
5、t deviation. 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 throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the
6、 decimal marker. Wherever the words This part of IS0 787 and International Standard appear, referring to this standard, they should be read as This Part of ES 3483 and British Standard respectively. Cross-reference A I nternstional dandard IS0 842-1 974 Corresponding British Standard BS 4726 : 1971
7、Methods for sampling raw materials for paints and varnishes (Technically equivalent) Additional information. In the last paragraph of clause 6 of IS0 787/9-1981, it is stated that the procedure is to be repeated if the duplicate determinations differ by more than 0.3 unit. In implementing this stand
8、ard in the United Kingdom, it is recommended that, if repeat dererminations are necessary, wherever possible both the sampling (clause 5) and the procedure (clause 6) should be repeated. In paragraph 1 of clause 6, the room temperature is unspecified. It is recommended that the temperature of the te
9、st should be 23 ? 2 “C.“ Compliance with a British Standard does not of itself confer immunity from legal obligations. These changes have been reported to the IS0 in a proposal to amend the text of the international standard. British Standards institution CEN EN*IS0*787-9 95 23 3404589 OLLLL3L 378 f
10、 BS 3483 : Part C4 : 1982 O introduction This document is a part of IS0 787, Generalmethods of test for pigments and extenders. 1 Scope and field of application This patt of IS0 787 specifies a general method of test for determining the pH value of an aqueous suspension of a sam- pie of pigment or e
11、xtender. NOTE - When this general method is applicable to a given pigment or extender, only a cross-reference to it should be included in the Intema- tional Standard relating to that pigment or extender, with a note of any detailed modification which may be needed in view of the special pro- perties
12、 of the material in question. Only when this general method is not applicable to a particular material should a special method for determination of pH value be specified. 2 Reference IS0 842, Raw materials for paints and varnishes - SarnpJing. 3 Reagent Freshly distilled water, boiled before use to
13、remove carbon dioxide, or water otherwise prepared of at least equivalent pu- rity. The water shall be boiled and cooled in a vessel made of chemically resistant glass, immediately before use. It shall be boiled for 5 to 10 min only, in order to avoid an increase of its pH value due to alkali dissol
14、ved from the glass vessel. Because water rapidly absorbs carbon dioxide, the cooled water shall be protected from access to the atmosphere and shall be stored for not more than 30 min. The closed container should be pro- tected by a soda asbestos tube or similar device. 4 Apparatus 4.1 resistant gla
15、ss, fitted with a ground glass or rubber stopper. Before using the container for the first time, boil dilute hydrochloric acid placed in the container and then rinse it thoroughly with distilled water. The rubber stopper shall not have been used for any other purpose. Glass container, of capacity 50
16、 ml, made of chemically 4.2 pH measuring device, capable of measurement to 0.1 unit, calibrated against buffer solutions of known pH value at the temperature of the test. 4.3 Balance, with an appropriate accuracy. 5 Sampling Take a representative sample of the material to be tested as described in I
17、S0 842. 6 Procedure *Carry out the determination in duplicate at room temperature. Prepare a 10 % (rnlrn) suspension of the material under test, using the distilled water (clause 3J, in the glass container (4.1 1. Stopper the container and shake it vigorously for 1 min. Allow it to stand for 5 min,
18、remove the stopper and determine, to the nearest 0.1 unit, the pH value of the suspension. If the material does not disperse easily in water, a wetting agent should be used; in the case of materials not soluble in ethanol, up to 5 mi of ethanol may be used but care should be taken to ensure that the
19、 minimum quantity is used and that it is neutral and free from pyridine. In the case of pigments soluble in ethanol, a neutral non-ionic wetting agent such as 10 ml of a 0,Ol % (mim) solution of an ethylene oxide condensate should be used. The neutrality of the wetting agent should be checked by mak
20、ing a blank determination. If a wetting agent is used, the volume of the water should be reduced so that a 10 % rn/rn) suspension is obtained. The type and quantity of wetting agent used shall be stated in the test report. NOTE - With pigments and extenders of relatively low density, it may be neces
21、sary to use a suspension of less than 10 % (m/m). In such cases the concentration of the suspension used should be stated in the test report. Record the pH values to the nearest 0,l unit and record the *temperature of the suspension to the nearest 1 OC. If the duplicate determinations of pH differ b
22、y more than 0,3 unit, the procedure shall be repeated. f See the paragraphs headed Additional information in the national foreword. 2 CEN EN*IS0*787-9 95 3404589 OLLLL32 204 A. EUROPEANsrAND NORME EUR0pEE“E EXJROP- NORM r EN IS0 787-9 Mardi 1995 ICs 87.060.10 Descriptors: paints, pigments, tests, ch
23、emical anaUrsis, if used, the type and quantity of wetting agent; the result of the test as indicated in clause 7, and the test temperature; e) any deviation, by agreement or otherwise, from the procedure specified; 8 Test report The test report shall contain at least the following information : al
24、the type and identification of the product tested; f) the date of the test. Publication referred to See the national foreword. For information about BSI services relating to third party certification to suitable British Standard product specifications, schemes for the registration of finns of assess
25、ed capability, testing and inspection facilities and Technical Help to Exporters, please contact the Director, Quality Assurance DMcion. BSI, Mayiands Avenue, Hemel Hempstead. Herts HP2 4SQ. Tel Hemel Hempstead 31 11. 3 CEN EN*IS0*787-9 95 3404589 OlL1iL35 T13 * : Amd. No. r Date of issue This Briti
26、sh Standard, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1982. British Standards Institution, 1982 First published March 1974 Fint revision November 1982
27、 BS 3483 : Part C4 : 1982 IS0 787/9-1981 ISBN O 580 12941 1 The following BSI references relate to the work on this standard: Canmittee reference PVCI1 Draft for comment 80/50282 DC British Standards Institution - 2 Park Street London W1A 2BS . Telephone 01-629 9000 . Telex 266933 821 1-2-1.3k-8 PVC
28、Il CEN EN*IS0*787-7 75 E3 3404589 Ollll3b 95T AMD 8612 8 Amendment No. 1 published and effective from 16 August 1995 to BS 3483 : Part C4: 1982 Methods for testing pigments for paints Part Ca Determination of pH vdue of an aqueous suspension NOTE. The European Committee for &dardu& . on(CEN)hSs acce
29、ptmi Is0 787-9: 1981 as a European Standard desigmtd as EN Is0 787-9 : 1995. This amendment implements EN Is0 787-9: 1995 as a British Standard in the =EN& Implementation of European Standar -Page Delete all the text before the nalional foreword. AMD 8612iAuguet 1996 _-_-_-_-_- National forewod At t
30、he end of pamgraph 1 inseri the following paragraph In 1994 the European commiaee for Standardhtion (CEN) accepted IS0 787-9 : 1%1 as European Standard EN Is0 787-9 : 1995. As a consequence of implementing the European standard this British standard is renumbered as BSENISO787-9 and any reference to
31、 J3S 3483 : PartC4 &odd be read as a reference to BS EN IS0 787-9. AMD BOlWAngust 1996 _-_-_-_- New fiont cover, EN tie page and foreword Attach the new fmnt page and, immediately aftex the national foreword, insert the aaached EN titie page and foreword. 9508 Product code 00541990 CEN EN*ISO*787-9
32、95 RB 3404587 OLLLL37 896 BRITISHSTANDARD f General methods of test for pigments and extenders Part 9. Determination of pH value of aqueous suspension TheEuropeanStandardENISO77-9: 1995hasthestatusofa BritishStandard ES EN IS0 787-9 : 1995 EUROPEANrnAFp NORME EUROPENNE f“ EUROP- Nom CEN EN*IS0*787-7
33、 75 3404587 OLLLL3B 722 EN IS0 787-9 March 1995 ICs 87.060.10 Descriptors: paints, pigments, tests, diemical anaim, demnbion of content, pH English version General methods of test for pigments and extenders- Part 9 Determinalion of pH value of aqueous suspension (IS0 787-9 : 1981) Mhdes gnrales dess
34、ai des pigments et matires de charge - Partie 9 Dtermination du pH dune suspension aqueuse Suspension Algemeine Prifverfahren fur Pigmente und Fullstoffe - Teil 9 Bestimm * ung des pH-Wertes einer waBrigen (IS0 787-9 : 1981) (IS0 787-9 : 1981) This European Standard was approved by CEN on 1994-10-17
35、. CEN members are bound to comp)y with the CENXENELEC Intemal Regulations which stipulate the conditions for giving this European Standanl the status of a national standard without any alteration. Uptodate lists and bibhographid references concerning such nationai standards may be obtained on applic
36、ation to the Centrai Secretariat or to any CEN member. This European standard exists in three officiai versions (English, French, German). A veision in any other language made by translation under the responsibility of a CEN member into its own language and notied to the Central Secreariat has the s
37、ame status as the official versions. CEN members are the donal 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 Standadkation
38、Comit Europen de Noxmakti on Europisches Komitee fur Normung Central Secretariat: me de Stassart 36, B-1050 Brusselis O 1995 Aii rights of reproduction and communication in any fom and by any means reserved in all countries to CEN and its members Ref. NO. EN IS0 787-9 : 1995 E CEN EN*IS0*787-9 95 34
39、04589 OLLLL39 669 Page 2 EN Is0 787-9 : 1995 Foreword This European standard has been taken over by the khnica Commiaee CENnu=29& Kgmens and extenders, from the work of Is(xM= 35, Paints and vanishes, of the international Organizaton for !3tandxdimtion (Iso). This European standard shall be given th
40、e status of a national standard, either by pubiicaon of an identicai text or by endorsement, at the latest by September 1995, and conicing national standards shall be withdrawn at the latestby September1995. According to the CEN/cENELM= Intenial Regulations, the foiiowing countries are bound to implement this EuropeanSandad Austria, Belgium, Denmark, Firtiand, France, Germany, Greece, Iceiand, Ireland, Italy, Luxembourg, Netheriandq Norway, pomigal, Spain, Sweden, Swikerland and United Kingdom. 4
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