1、BRITISH STANDARD BS EN ISO 787-5:1995 Incorporating Amendment No. 1 General methods of test for pigments and extenders Part 5: Determination of oil absorption value This part should be read in conjunction with the General Introduction to BS 3483 issued separately. The European Standard EN ISO 787-5:
2、1995 has the status of a British Standard ICS 87.060.10;87.060.30BSENISO787-5:1995 This British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsCommittee, was published under the authority ofthe Board of BSI and comesintoeffect on 30 November 1982 BSI
3、03-2000 First published March 1974 First revision November 1982 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for comment 81/54756 ISBN 0 580 12937 3 Amendments issued since publication Amd. No. Date of issue Comments 8687 December 1995 Indicated b
4、y a sideline in the marginBSENISO787-5:1995 BSI 03-2000 i Contents Page National foreword ii Foreword 2 Text of EN ISO 787-5 3 Publications referred to Inside back coverBSENISO787-5:1995 ii BSI 03-2000 National foreword This revision of Part B7 of BS3483 has been prepared under the direction of theP
5、igments, Paints and Varnishes Standards Committee. It is identical withISO787-5 “General methods of test for pigments and extenders Part5:Determination of oil absorption value” published in 1980 by the International Organization for Standardization (ISO). This Part of BS3483 supersedes BS3483-B7:197
6、4 which is withdrawn. In 1995 the European Committee for Standardization (CEN) accepted ISO787-5:1980 as European Standard EN ISO787-5:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BSEN ISO787-5. Terminology and conventions. The text of the Inter
7、national Standard has been approved as suitable for publication as a British Standard without 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 as a decimal marker. In Br
8、itish Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “This part of ISO787” and “International Standard” appear, referring to this standard, they should be read as “This Part of BS3483” and “British Standard” respectively. The Technical
9、Committee has reviewed the provisions of ISO150 and ISO/R385, to which references are made in the text, and has decided that they are acceptable for use in conjunction with this standard. Related British Standards for ISO150:1980 are BS 242, BS243, BS259, BS632:1969 “Linseed oil”. A related British
10、Standard for ISO/R385 was BS846:1962. Additional information. In clause 7 of ISO 787-5:1980 it is stated that duplicate determinations are to be carried out, but no indication is given of the acceptable difference between the two results. In implementing this standard in the UnitedKingdom, it is rec
11、ommended that the result of the test clause 9 c) should be reported as the mean of the two determinations and that, if the determinations differ by more than10% of the mean, wherever possible both the sampling (clause6) and the procedure (clause7) should be repeated. A British Standard does not purp
12、ort to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard IS
13、O 842:1974 BS 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, pagesi andii, theENISO title page, pages2 to4, an inside back cover and a back cover. This standard has been upd
14、ated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM ENISO 787-5 August1995 ICS87.060.10; 87.060.30 Descriptors: Paints, pigments, tests, density measurement, pykn
15、ometric analysis, test equipment, pyknometers English version General methods of test for pigments and extenders Part5: Determination of oil absorption value (ISO 787-5:1980) Mthodes gnrales dessai des pigments et matires de charge Partie 5: Dtermination de la prise dhuile (ISO 787-5:1980) Allgemein
16、e Prfverfahren fr Pigmente und Fllstoffe Teil 5: Bestimmung der lzahl (ISO 787-5:1980) This European Standard was approved by CEN on 1995-03-23. 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
17、national standard without any alteration. Up-to-date 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 i
18、n 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 versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece,
19、Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. 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 repro
20、duction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN ISO 787-5:1995 EENISO787-5:1995 BSI 03-2000 2 Foreword The text of the International Standard from ISO/TC35, Paints and varnishes, of the International Organization for Standardizatio
21、n (ISO) has been taken over as a European Standard by the Technical Committee CEN/TC298, Pigments and extenders. 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 February1996, and conflicting natio
22、nal standards shall be withdrawn at the latest by February1996. According to CEN/CENELEC 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,
23、 Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Contents Page Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 References 3 3 Definition 3 4 Reagent 3 5 Apparatus 3 6 Sampling 3 7 Procedure 3 8 Expression of results 4 9 Test report 4 Table 3ENISO787-5:1995 BSI 03-2000 3
24、0 Introduction This document is a part of ISO787, General methods of test for pigments and extenders. 1 Scope and field of application This part of ISO 787 specifies a general method of test for determining the oil absorption value of a sample of pigment or extender. The oil absorption value is usua
25、lly required to be compared with the value determined at the same time on an agreed sample of the product. NOTEWhen this general method is applicable to a given pigment or extender, only a cross-reference to it should be included in the International Standard relating to that pigment or extender, wi
26、th a note of any detailed modification which may be needed in view of the special properties of the material in question. Only when this general method is not applicable to a particular material should a special method for determination of oil absorption value be specified. 2 References ISO 150, Raw
27、, refined and boiled linseed oil for paints and varnishes Specifications and methods of test. ISO/R 385, Burettes. ISO 842, Raw materials for paints and varnishes Sampling. 3 Definition For the purpose of this International Standard, the following definition applies. oil absorption value the quantit
28、y of refined linseed oil that is absorbed under defined conditions by a sample of pigment or extender NOTEThe oil absorption value may be expressed either on a volume/mass basis or on a mass/mass basis. 4 Reagent Refined linseed oil, complying with the requirements of ISO150, and having an acid valu
29、e of5,0 to 7,0 mg KOH per gram. 5 Apparatus 5.1 Plate, of ground glass or marble, at least300mm 400mm. 5.2 Palette knife, with a tapered steel blade of the approximate dimensions140 to150mm long, 20 to25mm wide at its widest point and not less than12,5mm wide at its narrowest point. 5.3 Burette, of
30、capacity 10ml, complying with the requirements of ISO/R385. 5.4 Balance, with an appropriate accuracy. 6 Sampling Take a representative sample of the material to be tested as described in ISO842. 7 Procedure 1) Carry out the determination in duplicate. 7.1 Test portion Weigh the appropriate quantity
31、 of the sample in accordance with the expected oil absorption value as indicated in theTable below. Table 7.2 Determination Place the test portion (7.1) on the plate (5.1). Add the linseed oil slowly, 4 or 5 drops at a time, from the burette (5.3). After each addition, rub the oil into the product w
32、ith the palette knife (5.2), and continue the addition of oil at this rate until conglomerates of oil and product are formed. From this point, add the oil1drop at a time and follow each addition of oil by thoroughly rubbing with the palette knife. Cease the addition of oil when a paste of smooth con
33、sistency has been formed. This paste should just spread without cracking or crumbling and should only just adhere to the plate. Read the burette and note the quantity of oil used. The time taken for the complete operation should be between20 and25min and during this time, the whole product mass shal
34、l be manipulated with maximum effort by the operator. Where a comparison is required with the oil absorption value of an agreed sample of product, repeat the test in exactly the same way using the agreed sample. 1) See the paragraph headed “Additional information” in the national foreword. Expected
35、oil absorption value ml/100 g Mass of the test portion g less than 10 20 10 to 30 10 30 to 50 5 50 to 80 2 over 80 1ENISO787-5:1995 4 BSI 03-2000 8 Expression of results The oil absorption value, expressed either in millilitres of oil per100g of product or in grams of oil per100g of product, is give
36、n respectively by formulae (1) and (2): where Report the result to the nearest millilitre per100g or gram per100g. 9 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 (ISO7
37、87-5) or to a corresponding national standard; c) the result of the test as indicated in clause8; d) any deviation, by agreement or otherwise, from the procedure specified; e) the date of the test. .(1) .(2) V is the volume, in millilitres, of oil required; m is the mass, in grams, of the test porti
38、on. 100 V m - 93 V m -BSENISO787-5:1995 BSI 03-2000 Publications referred to See the national foreword.BS EN ISO 787-5:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view
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