1、BRITISH STANDARDBS EN ISO8130-2:2010Coating powders Part 2: Determination of density by gas comparisonpyknometer (referee method) (ISO 8130-2:1992) ICS 87.040Incorporating corrigendum April 2011National forewordThis British Standard is the UK implementation of EN ISO 8130-2:2010. It is identical to
2、ISO 8130-2:1992. It supersedes BS 3900-J6:1993 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not p
3、urport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN ISO 8130-2:2010This British Standard, having been prepared under the direction of the Pigments, Paint
4、s and Varnishes Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 April 1993 BSI 2011The following BSI references relate to the work on this standard: Committee reference PVC/10 Draft for comment 88/54511 DCAmendments/corrigenda issued s
5、ince publicationDate Comments 30 April 2011 This corigendum renumbers BS 390-J6:193 as BS EN ISO 8130-2:2010ISBN 978 0 580 72110 6EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8130-2 November 2010 ICS 87.040 English Version Coating powders - Part 2: Determination of density by gas compari
6、son pyknometer (referee method) (ISO 8130-2:1992) Poudres pour revtement - Partie 2: Dtermination de la masse volumique laide dun pycnomtre gaz (mthode de rfrence) (ISO 8130-2:1992) Pulverlacke - Teil 2: Bestimmung der Dichte mit einem Gasvergleichspyknometer (Schiedsverfarhen) (ISO 8130-2:1992) Thi
7、s European Standard was approved by CEN on 16 October 2010. 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 refere
8、nces concerning such national standards may be obtained on application to the CEN 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 i
9、nto its own language and notified to the CEN 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, It
10、aly, 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 Management Centre: Avenue Marnix 17, B-10
11、00 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8130-2:2010: EForeword The text of ISO 8130-2:1992 has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” of the International Organization for
12、 Standardization (ISO) and has been taken over as EN ISO 8130-2:2010 by 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
13、, at the latest by May 2011, and conflicting national standards shall be withdrawn at the latest by May 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
14、all such patent rights. 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, Germany, Greece, H
15、ungary, 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 8130-2:1992 has been approved by CEN as a EN ISO 8130-2:2010 without any mo
16、dification. BS EN ISO 8130-2:2010EN ISO 8130-2:2010 (E) BSI 2011 11 ScopeThis part of ISO8130 specifies a method for the determination of the density of coating powders using a gas comparison pyknometer. It can be used for all types of coating powder, is simple to carry out, but requires more expens
17、ive instrumentation than is often used for density determinations.The density of coating powders can also be determined using the liquid displacement pyknometer method described in ISO8130-3. The apparatus is relatively inexpensive, but the liquid displacement pyknometer method is liable to give err
18、oneous results, particularly if the powder swells in contact with the displacement liquid used or the displacement liquid does not totally displace the air between the powder particles. The liquid displacement method is much slower in execution, less accurate and is only to be used if it can be show
19、n that the same results will be obtained as for the gas comparison pyknometer method.2 Normative referenceThe following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO8130. At the time of publication, the edition indicated was valid. All
20、standards are subject to revision, and parties to agreements based on this part of ISO8130 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO 842:1
21、984, Raw materials for paints and varnishes Sampling. 3 PrincipleThe volume of a weighed test portion is determined by measuring the volume of gas displaced within a receptacle when the test portion is introduced. This is achieved by equalizing the pressure difference which arises due to the displac
22、ement of the gas. The density is then calculated from the mass and the volume of the test portion.4 Material4.1 Air or, if desired, helium, commercial grade, in a steel cylinder.Other gases may be used provided that the product under test is not affected and this deviation from the method is noted i
23、n the test report.5 Apparatus5.1 Gas comparison pyknometer, for the manual or automatic determination of the density, complying with the requirements given below.The essential design of a typical gas comparison pyknometer using air as the medium is outlined inFigure 1. It consists of two cylinders (
24、A and B) with pistons of exactly equal dimensions. The cylinders are connected by a valve and a pressure difference meter. The test portion, contained in a50ml beaker, is placed in cylinder B. Both pistons are moved by an equal amount which results in a pressure difference between cylinders A and B.
25、 The measuring piston in cylinder B is then moved again to re-establish equal pressure. The resulting volume change, which is equivalent to the volume of the test portion, is read from the scale.The swept volumes of the cylinders shall be measured and shown to be equal to within0,5% (relative). The
26、intervals in the scale showing the measured volume shall not be greater than1% of the measured volume. The scale calibration shall be checked by placing reference standards, of known volume and traceability, in the apparatus. The use of two different volumes is sufficient for routine checks, but at
27、least five different volumes shall be used for the initial calibrations to show that the scale is linear over the whole of its range.NOTE 1Suitable gas comparison pyknometers are available from several manufacturers.6 SamplingTake a representative sample of the product to be tested, as described in
28、ISO842.7 ProcedureCarry out the determination in duplicate at(23 1)C and, where applicable, at a relative humidity of (50 5)%.Adjust the apparatus in accordance with the manufacturers instructions, in particular to allow for the volume of the beaker material. Check the apparatus to ensure that there
29、 are no leaks.Weigh the sample beaker to the nearest1mg and fill it almost to the brim with the product under test, making sure that no powder is on the outside walls of the beaker. Weigh the beaker plus contents to the nearest1mg to determine the mass (m) of the test portion.BS EN ISO 8130-2:2010EN
30、 ISO 8130-2:2010 (E)2 BSI 2011Place the beaker and contents in the apparatus and determine the volume of the test portion by following the instructions given by the manufacturer of the apparatus. Repeat the volume measurement in order to ensure that the reading is consistent and calculate the mean (
31、V) of the two volumes.NOTE 2If the gas is dry, a slight change in density may be observed due to the drying of the test portion.If the two readings differ by more than2%, disregard the results.8 Expression of results8.1 CalculationCalculate the density p, in grams per millilitre, of the coating powd
32、er at23C, using the equation:whereIf the two determinations differ by more than0,04g/ml, repeat the procedure described in clause7.Calculate the mean of two valid determinations and report the result to the nearest0,01g/ml.8.2 PrecisionNo precision data are currently available.9 Test reportThe test
33、report shall contain at least the following information;a) all details necessary to identify the product tested;b) a reference to this part of ISO8130 (ISO8130-2);c) the type of gas comparison pyknometer and the gas used;d) the result of the test (individual values and mean value);e) any deviation f
34、rom the test method specified;f) the date of the test.m is the mass, in grams, of the test portion;V is the volume, in millilitres, of the test portion.P mV-=Figure 1 Example of a gas comparison pyknometerBS EN ISO 8130-2:2010EN ISO 8130-2:2010 (E) BSI 2011List of referencesSee national foreword.BS
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