1、BRITISH STANDARD BS EN ISO 787-10:1995 Incorporating Amendment No.1 General methods of testfor pigments andextenders Part10: Determination of density Pyknometer method The European Standard EN ISO787-10:1995 has the status of a BritishStandardBSEN ISO 787-10:1995 This BritishStandard, having been pr
2、epared under the directionof the Surface Treatments and Coatings Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15October1993 BSI03-2000 The following BSI references relate to the work on this standard: Committee reference STC/1 Draft for c
3、omment90/53472DC ISBN 0 580 22337 X Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Surface Treatments and Coatings Standards Policy Committee (STC/-) to Technical Committee STC/1, upon which the following bodies were represented: British
4、Cement Association British Coatings Federation Ltd. British Colour Makers Association British Precast Concrete Federation Ltd. British Railways Board Cement and Concrete Pigment Suppliers Association China Clay Association Oil and Colour Chemists Association Titanium Pigment Manufacturers Technical
5、Committee Zinc Development Association Amendments issued since publication Amd. No. Date Comments 8686 December 1995 Indicated by a sideline in the marginBSEN ISO 787-10:1995 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative r
6、eferences 3 3 Preliminary considerations 3 4 Sampling 3 5 Method A 3 6 Method B 5 7 Expression of results 6 8 Test report 6 Figure 1 Pyknometer, Gay-Lussac type 3 Figure 2 Vacuum apparatus 5 Table 1 Density of water at different temperatures 6 List of references Inside back coverBSEN ISO 787-10:1995
7、 ii BSI 03-2000 National foreword This Part of BS3483 has been prepared under the direction of the Surface Treatments and Coatings Standards Policy Committee. It is identical with ISO787-10:1993 General methods of test for pigments and extenders Part10:Determination of density Pyknometer method, pub
8、lished by the International Organization for Standardization (ISO). In1995 the European Committee for Standardization (CEN) accepted ISO787-10:1993 as European Standard EN ISO787-10:1995. As a consequence of implementing the European Standard this BritishStandard is renumbered as BS EN ISO787-10 and
9、 any reference to BS3483-B8 should be read as a reference to BS EN ISO787-10. This edition supersedes BS3483-B8:1982 which is withdrawn. The main differences between BS3483-B8:1982 and this standard are: a) reduced test times for both methods; b) introduction of a clause limiting the difference in d
10、uplicate results. The Technical Committee has reviewed the provisions of ISO565, to which normative reference is made in the text, and has decided that they are acceptablefor use in conjunction with this standard. A related BritishStandard is BS410:1986 Specification for test sieves. A British Stand
11、ard does not purport 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 Br
12、itishStandard ISO842:1984 BS4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN ISO title page, pages2 to6, an inside back cover and a back cover. This standard has been u
13、pdated (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 EN ISO787-10 August1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, tests, density measurement,
14、pyknometric analysis English version General methods of test for pigments and extenders Part10: Determination of density Pyknometer method (ISO787-10:1993) Mthodes gnrales dessai des pigments et matires de charge Partie10: Dtermination de la masse volumique Mthode utilisant un pyconmtre (ISO787-10:1
15、993) Allgemeine Prfverfahren fr Pigmente und Fllstoffe Teil10: Bestimmung der Dichte Pyknometerverfahren (ISO787-10:1993) This European Standard was approved by CEN on1995-03-23. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
16、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 Secretariat or to any CEN member. This European Standard exists in three official versions (Eng
17、lish, 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 versions. CEN members are the national standards bodies of Austria, Belgium, Denmark,
18、Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050
19、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.ENISO787-10:1995EEN ISO 787-10:1995 BSI 03-2000 2 Foreword The text of the International Standard from ISO/TC35, Paints and varnishes, of the International
20、Organization for Standardization (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 ofa national standard, either by publication of an identical text or by endorsement, at the latest by Febru
21、ary1996, and conflicting national 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, Lu
22、xembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom.EN ISO 787-10:1995 BSI 03-2000 3 1 Scope This part of ISO787 specifies general methods oftest for determining the density of a sample ofpigment or extender, using a pyknometer. ISO787-23:1979, General methods of
23、 test for pigments and extenders Part23: Determination ofdensity (using a centrifuge to remove entrainedair), specifies a general method using a centrifuge to remove trapped air. NOTE 1The general methods given in the various parts of ISO787 are usually applicable to any pigment or extender. Thus on
24、ly a cross-reference to the appropriate part of ISO787 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 view of the special properties of the material in question. Only when the genera
25、l methods are not applicable to a particular material is a different method for determination of density to be specified. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO787. At the time of publication,
26、 the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO787 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currentl
27、y valid International Standards. ISO565:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO842:1984, Raw materials for paints and varnishes Sampling. 3 Preliminary considerations 3.1 Displacement liquid 3.1.1 A liquid shall be selected in
28、 which the material to be tested is insoluble and which has good wetting properties and a low evaporation rate under a vacuum. A high-boiling aliphatic hydrocarbon solvent with a final boiling point over170 C is normally suitable. NOTE 2In addition to organic liquids, water with added wetting agent
29、is also suitable. 3.1.2 Particular care is necessary in the selection ofthe liquid if carbon black is to be examined. The liquid selected shall have particularly good wetting properties for carbon black. NOTE 3Carbon tetrachloride has been found suitable. 3.2 Temperature of the determination The tem
30、perature at which the determination is carried out significantly affects the density of the displacement liquid used, but not that of the material tested. In order that the determination may be carried out conveniently in the laboratory, the temperature of the determination shall be at least5 C abov
31、e laboratory temperature. 4 Sampling Take a representative sample of the material to betested, as described in ISO842. 5 Method A 5.1 Apparatus Ordinary laboratory apparatus and glassware, together with the following. 5.1.1 Pyknometer, Gay-Lussac type, of capacity25ml or50ml, with a stopper and loos
32、e-fitting cap (seeFigure 1) or other suitable typeof pyknometer. Figure 1 Pyknometer, Gay-Lussac typeEN ISO 787-10:1995 4 BSI 03-2000 5.1.2 Vacuum apparatus, comprising the items described in5.1.2.1 and5.1.2.2. NOTE 4Other types of vacuum apparatus of suitable design may be used, in which case the p
33、rocedure described in5.2.3 may need to be modified. 5.1.2.1 Vacuum desiccator, fitted with a two-hole stopper. A glass tube with a three-way stopcock shall pass through one hole of the stopper and connect the desiccator to the vacuum pump(5.1.2.2), and the stem of a dropping funnel shall pass throug
34、h the other hole of the stopper. 5.1.2.2 Vacuum pump, or other apparatus, capable of reducing the pressure to less than2kPa 1) . 5.1.3 Water bath, thermostatically controlled, capable of being maintained to within 0,1 C ata temperature within the range25 C to30 C (or at an agreed test temperature ou
35、tside this range). 5.1.4 Sieve, with a nominal mesh aperture of5004m, complying with the requirements ofISO565. 5.1.5 Balance, accurate to1mg or better. 5.2 Determination Carry out the determination in duplicate. 5.2.1 Volume of pyknometer 5.2.1.1 Clean and dry the pyknometer(5.1.1), and its stopper
36、 and cap. Fill the pyknometer with the displacement liquid (see3.1) and, after allowing it to attain the temperature of the water bath(5.1.3) as described in5.2.3.3, insert the stopper, wipe the excess liquid from the outside of the stopper, attach the cap and wipe the pyknometer dry. Transfer the p
37、yknometer and the cap to the case of the balance(5.1.5), allow to stand for15min and weigh to the nearest1mg. NOTE 5If the density of the displacement liquid is already known (for example from previous determinations), it is unnecessary to weigh the pyknometer filled with the displacement liquid. 5.
38、2.1.2 Finally empty, clean and dry the pyknometer, stopper and cap, and fill with distilled water. Repeat the procedure described in5.2.1.1. NOTE 6If the quantity of water that fills a pyknometer has already been determined several times, it is unnecessary to repeat the determination every time the
39、pyknometer is used. 5.2.2 Preparation of sample Thoroughly mix the sample and pass a sufficient quantity (see5.2.3.1) of it through the sieve(5.1.4). Dry by heating it at (105 2) C for2h and allow to cool to room temperature in a desiccator. For materials which decompose when dried under the conditi
40、ons stated, a temperature and time shall be selected that avoid decomposition. 5.2.3 Procedure 5.2.3.1 Wash and dry the pyknometer, stopper and cap, and weigh to the nearest1mg. Introduce into the pyknometer, by means of a dry funnel, a suitablequantity of the dried sample (1g to10g when a25ml pykno
41、meter is used, or2g to20g when a50ml pyknometer is used, depending on thedensity) so that the pyknometer is not more than half-filled. Reweigh the stoppered pyknometer and cap. 5.2.3.2 Place the pyknometer containing the test portion in the vacuum desiccator(5.1.2.1) and position the dropping funnel
42、 so that the stem of the funnel extends into the pyknometer. Close the stopcock of the dropping funnel and the three-way stopcock connecting the desiccator to the vacuum pump(5.1.2.2), start the pump and gradually open the three-way stopcock to the pump. Fill the dropping funnel with the displacemen
43、t liquid (see3.1) and,15min after the pressure in the desiccator has been reduced to less than2kPa, close the three-way stopcock and gradually open the stopcock of the funnel to add slowly the displacement liquid until the surface of the liquid is about15mm above the surface of the test portion. Clo
44、se the stopcock of the funnel and re-open the three-way stopcock to the pump, taking care to avoid losses by suction. Allow the pyknometer to remain in the desiccator under reduced pressure (not greater than2kPa) for about4h or until no air bubbles are visible in the liquid. Tap the desiccator occas
45、ionally to assist in removing trapped air. Stop the pump and gradually open the three-way stopcock to admit air into the desiccator until atmospheric pressure is restored. 5.2.3.3 Remove the pyknometer from the desiccator, fill it completely with the displacement liquid and place it in the water bat
46、h(5.1.3) maintained at the selected test temperature to within 0,1 C (see3.2). Allow the pyknometer to remain in the bath for at least30min in order to allow the pyknometer to reach the temperature of the bath and then carefully insert the stopper so that the liquid just fills the capillary. Wipe th
47、e excess liquid from the outside of the stopper. Remove the pyknometer from the bath, attach the cap and carefully wipe the pyknometer dry. Transfer the pyknometer and cap to the case of the balance(5.1.5), allow to stand for15min and weigh to the nearest1mg. 5.2.3.4 If the difference between the du
48、plicate results is greater than0,03g/ml, repeat the determination. 1) 1kPa=10mbarEN ISO 787-10:1995 BSI 03-2000 5 6 Method B 6.1 Apparatus Ordinary laboratory apparatus and glassware, together with the following. 6.1.1 The apparatus specified in5.1, except for the vacuum desiccator(5.1.2.1). 6.1.2 V
49、acuum apparatus, as shown in Figure 2, witha glass tube into which the stem of a dropping funnel shall be sealed, the seal being strong enough to withstand the manipulation of the funnel and the applied vacuum. The glass tube shall have the same interior diameter as the neck of the pyknometer. The stem of the dropping funnel shall be approximately10mm longer than the part of theglass tube leading to the pyknometer. The pyknometer shall be connected to the glass tube byarubber tube in such a way that the stem of thedropping funn
