1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 2811-3:2011Paints and varnishes Determination of densityPart 3: Oscillation method (ISO2811-3:2011)BS EN ISO 2811-3:2011 BRITISH STANDARDNational forewordThis British S
2、tandard is the UK implementation of EN ISO2811-3:2011. It supersedes BS EN ISO 2811-3:2001 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/10, Test methods for paints.A list of organizations represented on this committee can beobtained on request to
3、its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 66283 6ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was pu
4、blished under the authority of theStandards Policy and Strategy Committee on 31 March 2011.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2811-3 March 2011 ICS 87.040 Supersedes EN ISO 2811-3:2001English Version Paints and varnishes - De
5、termination of density - Part 3: Oscillation method (ISO 2811-3:2011) Peintures et vernis - Dtermination de la masse volumique - Partie 3: Mthode par oscillation (ISO 2811-3:2011) Beschichtungsstoffe - Bestimmung der Dichte - Teil 3: Schwingungsverfahren (ISO 2811-3:2011) This European Standard was
6、approved by CEN on 19 February 2011. 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 national standard without any alteration. Up-to-date lists and bibliographical references concerning such na
7、tional standards may be obtained on application to the CEN-CENELEC 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 lan
8、guage and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, La
9、tvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brus
10、sels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2811-3:2011: EBS EN ISO 2811-3:2011EN ISO 2811-3:2011 (E) 3 Foreword This document (EN ISO 2811-3:2011) has been prepared by Technical Committee ISO/TC 35 “Paints and va
11、rnishes“ in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN. 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 2011, and co
12、nflicting national standards shall be withdrawn at the latest by September 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This
13、document supersedes EN ISO 2811-3:2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Ge
14、rmany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 2811-3:2011 has been approved by CEN as a EN ISO 2811-3:201
15、1 without any modification. BS EN ISO 2811-3:2011ISO 2811-3:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Principle .1 5 Temperature.2 6 Apparatus.2 7 Sampling 2 8 Procedure.2 8.1 General .2 8.2 Determination 2 9 Calcu
16、lation .3 10 Precision 3 10.1 General .3 10.2 Repeatability limit, r 3 10.3 Reproducibility limit, R3 11 Test report3 Annex A (normative) Calibration of the apparatus Determination of the apparatus constants 5 Annex B (informative) Density values for damp air, air-free water and tetrachloroethylene6
17、 Annex C (informative) Calculation of density at the reference temperature from measurements at other temperatures8 BS EN ISO 2811-3:2011ISO 2811-3:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards
18、 bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO 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 organiza
19、tions, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in t
20、he ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of
21、 the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2811-3 was prepared by Technical Committee ISO/TC 35, Paints a
22、nd varnishes, Subcommittee SC 9, General test methods for paints and varnishes. This second edition cancels and replaces the first edition (ISO 2811-3:1997), which has been technically revised. The main changes are: a) The unit for the density has been changed from grams per millilitre to grams per
23、cubic centimetre, because this is the more common SI unit. b) The determination in duplicate has been changed to a single determination. c) The precision data has been corrected. d) The normative references have been updated. ISO 2811 consists of the following parts, under the general title Paints a
24、nd varnishes Determination of density: Part 1: Pyknometer method Part 2: Immersed body (plummet) method Part 3: Oscillation method Part 4: Pressure cup method BS EN ISO 2811-3:2011INTERNATIONAL STANDARD ISO 2811-3:2011(E) ISO 2011 All rights reserved 1Paints and varnishes Determination of density Pa
25、rt 3: Oscillation method 1 Scope This part of ISO 2811 specifies a method for determining the density of paints, varnishes and related products using an oscillator. The method is suitable for all materials, including paste-like coatings. If a pressure-resistant type of apparatus is used, the method
26、is also applicable to aerosols. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app
27、lies. ISO 1513, Paints and varnishes Examination and preparation of test samples ISO 3696, Water for analytical laboratory use Specification and test methods ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling 3 Terms and definitions For the purposes of this document, th
28、e following terms and definitions apply. 3.1 density mass divided by the volume of a portion of a material NOTE This is expressed in grams per cubic centimetre. 4 Principle A glass or stainless-steel U-tube is filled with the product under test. The tube is clamped at both ends and then subjected to
29、 oscillation. The resonance frequency of the filled tube varies with the mass contained in the tube, i.e. the density of the product under test. BS EN ISO 2811-3:2011ISO 2811-3:2011(E) 2 ISO 2011 All rights reserved5 Temperature The effect of temperature on density is highly significant with respect
30、 to filling properties, and varies with the type of product. Carry out the test at (23,0 0,5) C. NOTE For some purposes a different temperature, for example (20,0 0,5) C, might be needed. The test sample, tube and oscillator shall be conditioned to the specified or agreed temperature, and it shall b
31、e ensured that the temperature variation does not exceed 0,5 C during testing. 6 Apparatus Ordinary laboratory apparatus and glassware, together with the following. 6.1 Oscillator, consisting of a glass or stainless-steel U-tube and apparatus to cause the U-tube to oscillate. One model displays the
32、resonance frequency; another calculates and displays the density. 6.2 Thermometer, accurate to 0,2 C and graduated at intervals of 0,2 C or finer. 6.3 Temperature-controlled chamber, capable of maintaining the oscillator and test sample at the specified or agreed temperature (see Clause 5). 6.4 Disp
33、osable plastic syringe, of sufficient capacity to fill the U-tube. 7 Sampling Take a representative sample of the product under test, as described in ISO 15528. Examine and prepare the sample as described in ISO 1513. 8 Procedure 8.1 General Carry out a single determination on a fresh test sample. 8
34、.2 Determination Ensure that the apparatus is clean, both by inspection and by checking that the display indicates the density of air (or the corresponding period of oscillation at resonance). Fill the U-tube with the product under test (about 2 cm3) in accordance with the oscillator manufacturers i
35、nstructions (i.e. until the level is above the upper of the two clamps holding the U-tube). Avoid introducing air bubbles, which cause unsteady readings. NOTE The presence of non-visible air bubbles becomes apparent due to the fact that the measured values vary considerably. Close the upper filler-h
36、ole. Using the thermometer (6.2), check that the temperature of the temperature-controlled chamber is within the specified limits. Start up and operate the oscillator in accordance with the manufacturers instructions. BS EN ISO 2811-3:2011ISO 2811-3:2011(E) ISO 2011 All rights reserved 3If using an
37、apparatus which displays the period of oscillation at resonance, take at least three readings of the period of oscillation, T, and at least two of the temperature. The values of T shall not differ by more than 0,000 1 ms. If they do, make three more measurements. If using an apparatus which displays
38、 the density directly, take at least three readings of the density and at least two of the temperature. The density values shall not differ by more than 0,000 2 g/cm3. If they do, make three more measurements. After the measurements, clean the apparatus in accordance with the manufacturers instructi
39、ons. It is essential to leave it clean and dry, and to check that the display indicates the density of air (or the corresponding period of oscillation). 9 Calculation If the period of oscillation, T, has been read, calculate the density, , using Equation (1): ()21BAT = (1) where A and B are two appa
40、ratus constants (see Annex A). If the temperature used is not the reference temperature, the density can be calculated using Equation (C.1). 10 Precision 10.1 General The precision of the method depends on the characteristics of the product to be tested. For materials which contain no entrapped air,
41、 the values in 10.2 and 10.3 are valid. 10.2 Repeatability limit, r The value below which the absolute difference between two single test results, obtained on identical material by one operator in one laboratory using the same equipment within a short interval of time using the standardized test met
42、hod, may be expected to lie, with a 95 % probability, is 0,001 g/cm3. 10.3 Reproducibility limit, R The value below which the absolute difference between two test results, obtained on identical material by operators in different laboratories using the standardized test method, may be expected to lie
43、, with a 95 % probability, is 0,002 g/cm3. 11 Test report The test report shall include at least the following information: a) all details necessary to identify the product tested; b) a reference to this part of ISO 2811, i.e. ISO 2811-3:2011; c) the type (model) of apparatus used; d) the test tempe
44、rature; BS EN ISO 2811-3:2011ISO 2811-3:2011(E) 4 ISO 2011 All rights reservede) the density measurement determined in accordance with 8.2, or the density calculated in accordance with Clause 9, in grams per cubic centimetre, rounded to the nearest 0,001 g/cm3; f) any deviation from the test method
45、specified; g) any unusual features (anomalies) observed during the test; h) the date of the test. BS EN ISO 2811-3:2011ISO 2811-3:2011(E) ISO 2011 All rights reserved 5Annex A (normative) Calibration of the apparatus Determination of the apparatus constants A.1 General If using an apparatus which di
46、splays the period of oscillation at resonance, the apparatus constants need to be determined for use in Equation (A.1). If using an apparatus which displays the density directly, the constants are entered into the memory of the data-processing unit of the apparatus. The apparatus constants have to b
47、e determined and regularly checked by the user. They are usually obtained by measurements in air and in distilled or deionized water of at least grade 2 purity, as defined in ISO 3696. A.2 Procedure Make several measurements with air and water over a period of several minutes in each case, as descri
48、bed in 8.2. If the values obtained are not constant, repeat the measurements. The apparatus constants are valid only at temperatures which do not differ from the temperature, tT, at which they were determined by more than 0,5 C. For other test temperatures, the constants shall be determined again. T
49、he apparatus constants shall be determined at the beginning of each series of measurements and checked at the end. NOTE Differences can occur in the period of oscillation due to the presence of impurities. A.3 Calculation of apparatus constants Calculate the mean values of the period of oscillation for water, TW, and for air, TA. Use these mean values to calculate the two apparatus constants, A and B, as given by Equation (A.1): ()21BAT = (A.1) BS EN ISO 2811-3:2011ISO 2811-3:2011(E) 6 ISO 2011 All ri
