BS EN ISO 2811-2-2011 Paints and varnishes Determination of density Immersed body (plummet) method《涂料和清漆 密度的测定 潜体法》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 2811-2:2011Paints and varnishes Determination of densityPart 2: Immersed body (plummet) method(ISO 2811-2:2011)BS EN ISO 2811-2:2011 BRITISH STANDARDNational forewordTh

2、is British Standard is the UK implementation of EN ISO2811-2:2011. It supersedes BS EN ISO 2811-2:2001 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

3、 request to 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 66281 2ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Sta

4、ndard was published 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 2811-2 March 2011 ICS 87.040 Supersedes EN ISO 2811-2:2001English Version Paints and va

5、rnishes - Determination of density - Part 2: Immersed body (plummet) method (ISO 2811-2:2011) Peintures et vernis - Dtermination de la masse volumique - Partie 2: Mthode par immersion dun corps (plongeur) (ISO 2811-2:2011) Beschichtungsstoffe - Bestimmung der Dichte - Teil 2: Tauchkrper-Verfahren (I

6、SO 2811-2:2011) This European Standard was 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 bi

7、bliographical references concerning such national 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 resp

8、onsibility of a CEN member into its own language 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, G

9、reece, Hungary, Iceland, Ireland, Italy, Latvia, 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 Manag

10、ement Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2811-2:2011: EBS EN ISO 2811-2:2011EN ISO 2811-2:2011 (E) 3 Foreword This document (EN ISO 2811-2:2011) has been prepared by T

11、echnical Committee ISO/TC 35 “Paints and varnishes“ 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 endorseme

12、nt, at the latest by September 2011, and conflicting 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 ident

13、ifying any or all such patent rights. This document supersedes EN ISO 2811-2:2001. 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 Repu

14、blic, Denmark, Estonia, Finland, France, Germany, 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 2811-2:2011 has

15、been approved by CEN as a EN ISO 2811-2:2011 without any modification. BS EN ISO 2811-2:2011ISO 2811-2:2011(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.1 6 Apparatus.2 7 Sampling 3 8 Procedure.3

16、 8.1 General .3 8.2 Determination 3 9 Calculation .4 10 Precision 5 10.1 General .5 10.2 Repeatability limit, r 5 10.3 Reproducibility limit, R5 11 Test report5 Annex A (informative) Example of a calibration method 7 Annex B (informative) Temperature variation8 BS EN ISO 2811-2:2011ISO 2811-2:2011(E

17、) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body inte

18、rested 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. ISO collaborates closely with the International Electrotechnica

19、l Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the t

20、echnical committees are circulated 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 document may be the subject of patent rights. I

21、SO shall not be held responsible for identifying any or all such patent rights. ISO 2811-2 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes. This second edition cancels and replaces the first edition (ISO 2811-2:199

22、7), which has been technically revised. The main changes are the following. a) The unit for the density has been changed from grams per millilitre to grams per cubic centimetre, because this is the more common SI unit. b) The determination in duplicate has been changed to a single determination. c)

23、The information on calibration procedure has been changed to an example only and the status of Annex B has been changed from normative to informative. d) The precision data has been updated by an interlaboratory test. e) The normative references have been updated. ISO 2811 consists of the following

24、parts, under the general title Paints and 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 2811-2:2011INTERNATIONAL STANDARD ISO 2811-2:2011(E) ISO 2011 All rights reserved 1Paints an

25、d varnishes Determination of density Part 2: Immersed body (plummet) method 1 Scope This part of ISO 2811 specifies a method for determining the density of paints, varnishes and related products, using balls or other round bodies as immersion bodies (plummets). The method is limited to materials of

26、low or medium viscosity, and is particularly suitable for production control. 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 refe

27、renced document (including any amendments) applies. ISO 1513, Paints and varnishes Examination and preparation of test samples ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling 3 Terms and definitions For the purposes of this document, the following terms and definitio

28、ns apply. 3.1 density mass divided by the volume of a portion of a material NOTE It is expressed in grams per cubic centimetre. 4 Principle The method is based on Archimedes principle. A container is filled with the product under test and placed on the analytical balance. The plummet is attached to

29、a tripod and is immersed in the product under test. The density is calculated from the balance readings before the plummet is immersed in the material under test and after it is immersed. 5 Temperature The effect of temperature on density is highly significant with respect to filling properties, and

30、 varies with the type of product. BS EN ISO 2811-2:2011ISO 2811-2:2011(E) 2 ISO 2011 All rights reservedFor international reference purposes, it is essential to standardize one test temperature, and (23,0 0,5) C is specified in this part of ISO 2811. However, it can be more convenient to carry out c

31、omparative testing at some other agreed temperature, for example (20,0 0,5) C, as specified by relevant weights and measures legislation (see B.2). The test sample and plummet shall be conditioned to the specified or agreed temperature, and it shall be ensured that the temperature variation does not

32、 exceed 0,5 C during testing. 6 Apparatus Ordinary laboratory apparatus and glassware, together with the following. 6.1 Plummets, of non-corrodible metal, e.g. copper-zinc alloy (brass), stainless steel or aluminium, as illustrated in Figure 1. The type illustrated is available with a volume of 10 c

33、m3or 100 cm3. Dimensions in millimetres Key 1 volume 100 cm3or 10 cm3to the centre of the constriction in the stem d 3 mm for the 100 cm3plummet or 1 mm for the 10 cm3plummet Figure 1 Plummet Each plummet shall be marked with its volume, the reference temperature and the surface tension and density

34、of the reference liquid in the following form: 100 cm323 C 25 mN/m 1,2 g/cm36.2 Analytical balance, accurate to 10 mg. 6.3 Thermometer, accurate to 0,2 C and graduated at intervals of 0,2 C or finer. 6.4 Temperature-controlled chamber, capable of accommodating the balance, plummet and sample and mai

35、ntaining them at the specified or agreed temperature (see Clause 5). BS EN ISO 2811-2:2011ISO 2811-2:2011(E) ISO 2011 All rights reserved 36.5 Tripod or other suitable device, for suspending the plummet and accurately adjusting its depth of immersion. 7 Sampling Take a representative sample of the p

36、roduct 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. The volume of the plummet shall be calibrated. 8.2 Determination 8.2.1 Selection of procedure There are two procedu

37、res, one for all paints in general and one for those products containing fast-evaporating solvents. 8.2.2 Procedure A For all paints in general Ensure the plummet (6.1) is thoroughly clean before use. Place the plummet and the test sample next to the balance (6.2) in the temperature-controlled chamb

38、er (6.4) for approximately 30 min. Place a sufficient volume of the test sample in a vessel of suitable size and capacity, e.g. 400 cm3for a 100 cm3plummet and 100 cm3for a 10 cm3plummet. Using the thermometer (6.3), measure the temperature of the test sample. Check throughout the determination that

39、 the temperature of the chamber remains within the specified limits. Place the vessel plus test sample on the balance and record the mass, m1(uncorrected for buoyancy), to the nearest 10 mg. Clamp the plummet onto the tripod (6.5) in such a way that it can be immersed in the sample without touching

40、the sides of the vessel (see Figure 2). Immerse the plummet in the sample until the surface of the liquid reaches the middle of the constriction in the plummet stem and record the mass, m2, to the nearest 10 mg. NOTE If the balance is tared between weighings, mass m1= 0. BS EN ISO 2811-2:2011ISO 281

41、1-2:2011(E) 4 ISO 2011 All rights reservedFigure 2 Determination of density by the plummet method 8.2.3 Procedure B For paints containing fast-evaporating solvents Ensure that the plummet (6.1) is thoroughly clean before use. Place the plummet and the test sample next to the balance (6.2) in the tem

42、perature-controlled chamber (6.4) for approximately 30 min. Using the thermometer (6.3), measure the temperature, tT, of the test sample. Check throughout the determination that the temperature of the chamber remains within the specified limits. Place a vessel of suitable size, containing a sufficie

43、nt volume of test sample, on a laboratory jack. Clamp the plummet onto a retort stand and place the stand on the balance in such a way that the plummet can be immersed in the sample by raising the laboratory jack without the plummet touching the sides of the vessel. Record the mass, m2, of the stand

44、 plus plummet. Raise the laboratory jack until the surface of the liquid reaches the middle of the constriction in the plummet stem and record the mass, m1. Equation (1) can be used to calculate the density, except that m1and m2are as follows: m1is the mass of the retort stand and plummet after imme

45、rsion of the plummet in the sample; m2is the mass of the retort stand and plummet before immersion of the plummet. 9 Calculation Calculate the density, , of the product, in grams per cubic centimetre, at the test temperature, tT, using Equation (1): 21tmmV= (1) BS EN ISO 2811-2:2011ISO 2811-2:2011(E

46、) ISO 2011 All rights reserved 5where m1is the mass, in grams, of the vessel containing the sample before immersion of the plummet; m2is the mass, in grams, of the vessel after immersion of the plummet; Vtis the volume, in cubic centimetres, of the plummet up to the middle of the constriction in the

47、 stem at the test temperature, tT, determined in accordance with Annex B. NOTE The result is not corrected for air buoyancy because the uncorrected value is required by most filling-machine control procedures and the correction (0,001 2 g/cm3) is negligible in relation to the precision of the method

48、. If the test temperature used is not the reference temperature, the density may be calculated using Equation (B.2). 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, the values in 10.2 and

49、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, within a short interval of time using the standardized test method, may be expected to lie, with a 95 % probability using the same equipment is 0,002 g/cm3for solvents, 0,011 g/cm3for coating materials using the 10 cm3plummet, and 0,003 g/cm3for coating materials using the 100 cm3plummet. 10.3 Reproducibility limi