1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 6344-3:2013Coated abrasives Grain sizeanalysisPart 3: Determination of grain sizedistribution of microgrits P240 to P2500BS ISO 6344-3:2013 BRITISH STANDARDNational forewo
2、rdThis British Standard is the UK implementation of ISO 6344-3:2013. Itsupersedes BS ISO 6344-3:1998 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MTE/13, Grinding wheels, abrasive tools, paper andcloths, and powders.A list of organizations represente
3、d on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 70616
4、5ICS 25.100.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2013.Amendments issued since publicationDate Text affectedBS ISO 6344-3:2013 ISO 2013Coated ab
5、rasives Grain size analysis Part 3: Determination of grain size distribution of microgrits P240 to P2500Abrasifs appliqus Granulomtrie Partie 3: Dtermination de la distribution granulomtrique des micrograins P240 P2500INTERNATIONAL STANDARDISO6344-3Second edition2013-05-01Reference numberISO 6344-3:
6、2013(E)BS ISO 6344-3:2013ISO 6344-3:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photoco
7、pying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-m
8、ail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6344-3:2013ISO 6344-3:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Testing of microgrits P240 to P1200 . 14.1 General . 14.2 Designation of the test me
9、thod . 24.3 Test procedure using the US sedimentation tube . 25 Testing of microgrits P1500 to P2500 .175.1 General 175.2 Designation of the test method 185.3 Test procedure 186 Designation .207 Marking .20Annex A (informative) Form for recording results of a sedimentation analysis of microgrits of
10、the P series using the US sedimentometer .21Annex B (informative) Example of the presentation of the test data for the grain size distribution of fused aluminium oxide .23Bibliography .25BS ISO 6344-3:2013ISO 6344-3:2013(E)ForewordISO (the International Organization for Standardization) is a worldwi
11、de 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 interested in a subject for which a technical committee has been established has the right to be represented on tha
12、t committee. International organizations, 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 ac
13、cordance 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 technical committees are circulated to the member bodies for voting. Publication as an International Standard requ
14、ires 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. ISO shall not be held responsible for identifying any or all such patent rights.ISO 6344-3 was prepared by Technica
15、l Committee ISO/TC 29, Small tools, Subcommittee SC 5, Grinding wheels and abrasives.This second edition cancels and replaces the first edition (ISO 6344-3:1998). It also incorporates the Technical Corrigendum ISO 6344-3:1998/Corr.1:1999. The significant changes against ISO 6344-3:1998 are the follo
16、wing:a) new definitions have been included in Clause 3;b) the test procedure in 4.3 has been completely updated; requirements for the use of the US sedimentation tube have replaced the reference to ISO 8486-2, in order to facilitate the use of this part of ISO 6344;c) Bibliography has been added.ISO
17、 6344 consists of the following parts, under the general title Coated abrasives Grain size analysis: Part 1: Grain size distribution test Part 2: Determination of grain size distribution of macrogrits P12 to P220 Part 3: Determination of grain size distribution of microgrits P240 to P2500iv ISO 2013
18、 All rights reservedBS ISO 6344-3:2013INTERNATIONAL STANDARD ISO 6344-3:2013(E)Coated abrasives Grain size analysis Part 3: Determination of grain size distribution of microgrits P240 to P25001 ScopeThis part of ISO 6344 specifies a method for determining or testing the grain size distribution of el
19、ectro-fused aluminium oxide and silicon carbide microgrits P240 to P2500 for coated abrasives as defined in ISO 6344-1.It applies both to those grits used in the manufacture of coated abrasive products and to those grits taken from products for testing purposes.2 Normative referencesThe following do
20、cuments, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6344-1:1998, Coated
21、abrasives Grain size analysis Part 1: Grain size distribution test3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1microgritabrasive grit having a median equivalent diameter of 58,5 m to 8,4 m, whose grain size distribution is determined by sedim
22、entation3.2grain size distributionpercentage of grains of different sizes composing the macrogrit or microgrit4 Testing of microgrits P240 to P12004.1 GeneralThe testing of microgrits P240 to P1200 by sedimentation shall be carried out using the US sedimentometer whereby the grain size distribution
23、is determined; see 4.3.1.The limits are specified in ISO 6344-1:1998, Table 2, which is reproduced as (the following) Table 1. ISO 2013 All rights reserved 1BS ISO 6344-3:2013ISO 6344-3:2013(E)Table 1 Grain size distribution of microgrits P240 to P1200 ds-values for testing with the US sedimentomete
24、rGrit designationds0value max. mds3value max. mMedian grain size ds50values mds95value min. mP240 110 81,7 58,5 2,0 44,5P280 101 74,0 52,2 2,0 39,2P320 94 66,8 46,2 1,5 34,2P360 87 60,3 40,5 1,5 29,6P400 81 53,9 35,0 1,5 25,2P500 77 48,3 30,2 1,5 21,5P600 72 43,0 25,8 1,0 18,0P800 67 38,1 21,8 1,0 1
25、5,1P1000 63 33,7 18,3 1,0 12,4P1200 58 29,7 15,3 1,0 10,2The permissible deviations are given in Table 2.Table 2 Permissible deviations resulting from the variations due to the measuring technique (US sedimentometer)Grit designationPermissible deviation fords3mds50mds95mP240+1,5 1,5 1,5P280P320P360+
26、1,5 1,0 1,5P400P500P600+1,5 0,8 1,5P800P1000P12004.2 Designation of the test methodThe designation of the test method by means of the US sedimentometer for microgrits P240 to P1200 is as follows: Test method Micro P4.3 Test procedure using the US sedimentation tube4.3.1 Testing by sedimentationThe t
27、esting of microgrits P240 to P1200 by sedimentation shall be carried out using the US sedimentation tube whereby the grain size distribution is determined.The principle of measurement is to determine the volumes of a suspension of the grit sample settled in the collecting tube as a function of time,
28、 and to calculate the equivalent grain diameter using Stokes law.2 ISO 2013 All rights reservedBS ISO 6344-3:2013ISO 6344-3:2013(E)The grain size distribution of microgrits P240 to P1200 is determined using the following criteria:a) the maximum grains diameter (theoretical grain diameter) of the fir
29、st sedimented grain (ds0value) shall not exceed the maximum permissible ds0value;b) the grain diameter (theoretical grain diameter) shall not exceed the maximum permissible ds3value at the 3 % point of the grain size distribution curve;c) the median grain diameter (theoretical grain diameter) shall
30、be within the specified tolerances of the ds50value at the 50 % point of the grain size distribution curve;d) the grain diameter (theoretical grain diameter) shall at least attain the ds95value at the 95 % point of the grain size distribution curve.The four criteria shall be met at the same time. Th
31、e values are specified in Table 1.The permissible deviations are given in Table 2.4.3.2 Test apparatusThe US sedimentation tube consists of a vertical sedimentation tube of 940 mm in length and of 20 mm inside diameter. It is surrounded by a water jacket in which the water temperature is maintained
32、at a constant level.A graduated collecting tube is fixed at the bottom of the sedimentation tube. The whole assembly is mounted on a frame, the base plate of which is fitted with level adjusting screws for keeping the tube vertical (see Figure 1).For the design and dimensions of the collecting tube,
33、 see Figure 2.To improve the accuracy of sedimentation volume readings, it is recommended that a horizontal beam light source and a magnifying glass be used. A time printer renders the recording of the sedimentation times easier. ISO 2013 All rights reserved 3BS ISO 6344-3:2013ISO 6344-3:2013(E)Dime
34、nsions in millimetresKey1 methyl alcohol level (initial)2 sedimentation tube3 water jacket4 thermometer5 collecting tube (see Figure 5)6 rubber centring spacer7 scale for height of sedimentation8 rubber gasket9 vertical adjusting screwsaWater inlet.bWater outlet.Figure 1 US sedimentation tube4 ISO 2
35、013 All rights reservedBS ISO 6344-3:2013ISO 6344-3:2013(E)Dimensions in millimetresKeyDial graduation and figures shall be in white.50 division marks at equal intervals (graduation about 1 mm).Length of division mark: 3 mmEvery fifth division mark: 4 mmThickness of division mark: 0,25 mmFigure 2 Co
36、llecting tube4.3.3 Test equipment4.3.3.1 Sedimentation mediumUse methyl alcohol of 95 % up to 99 % purity as the sedimentation medium.Adjust the sedimentation medium using the checking minerals specified in 4.3.4.1.3.4.3.3.2 Dispersing agentIn order to avoid grain agglomeration, a dispersing agent,
37、such as EDTA (tetrasodium salt of ethylendiamine tetra-acetic acid), shall be added to the methyl alcohol, i.e. 4 ml of a 1 % aqueous EDTA-solution per litre of methyl alcohol. ISO 2013 All rights reserved 5BS ISO 6344-3:2013ISO 6344-3:2013(E)4.3.3.3 Checking mineralsThe adjustment of the whole meas
38、uring procedure should be controlled by means of checking minerals 280 and 320. Each supply of checking minerals is accompanied by a cumulative volume grain size distribution curve (see Figure 3). The 10 %, 20 %, 30 %, 40 % and 50 % points shall not deviate by more than 0,5 micrometres (m) from the
39、sizes indicated in Table 3.NOTE The grain size distributions of the checking minerals do not correspond to identical grain sizes of this part of ISO 6344.Table 3 Grain diameter of checking mineralsVolume fraction of the settled checking minerals%Grain diameter d m Checking mineral280 3200 74,7 75,13
40、 62,1 58,710 52,9 1,06 49,8 120 47,9 0,96 44,2 0,8830 44,7 0,89 40,5 0,8140 42 0,84 37,5 0,7550 39,7 0,79 34,9 0,760 37,4 32,570 35 30,180 32,3 27,590 28,8 24,4100 20 16,56 ISO 2013 All rights reservedBS ISO 6344-3:2013ISO 6344-3:2013(E)KeyY volume fraction, %X grain diameter, d, mFigure 3 Cumulativ
41、e volume grain size distribution curve of checking minerals 280 and 3204.3.4 Testing4.3.4.1 Preparation for testing4.3.4.1.1 Setting up test deviceWhen setting up the US sedimentometer for use as the test device, check that the collecting tube is positioned centrally in the sedimentation tube. It is
42、 held in the vertical position by a rubber spacer located about 30 mm from the top of the collecting tube. Check this using a plumb line suspended from the top of the sedimentation tube and the collecting tube. The plumb line shall pass centrally through both the sedimentation tube and the collectin
43、g tube. The device is adjusted by means of the adjusting screws on the base plate.After adjustment, fill the water jacket and connect it to a thermostat.4.3.4.1.2 Test temperatureThe testing of the grain size shall be carried out under constant temperature with a permissible deviation of 0,1 C.It is
44、 convenient to use a test temperature of 25 C. The grain diameters indicated in Tables 4 and 5 for the respective times of sedimentation apply to this temperature only. ISO 2013 All rights reserved 7BS ISO 6344-3:2013ISO 6344-3:2013(E)For the determination of the grain diameters for other test tempe
45、ratures, see 4.3.5.1.4.3.4.1.3 Adjustment of the sedimentation mediumThe methyl alcohol used for the test shall be adjusted by means of one of the two checking minerals, 280 or 320.The grain sizes corresponding to 10 %, 20 %, 30 %, 40 % and 50 % points shall not deviate by more than 0,5 m from the v
46、alues specified on the curves supplied with the checking minerals. The average of the algebraic sum of the deviations shall not exceed 0,3 m.If agreement with the accompanying curves is not reached within the permissible tolerances, then the density and viscosity of the sedimentation medium shall be
47、 changed in such a way so that agreement is obtained.4.3.4.2 Test procedure4.3.4.2.1 Filling of sedimentation tubeFill the sedimentation tube with the previously adjusted sedimentation liquid to a height of 1 000 mm 2 mm (measured from the bottom of the collecting tube). Then, allow it to stand unti
48、l equilibrium is reached between the water jacket connected to the thermostat and the sedimentation tube temperatures.4.3.4.2.2 Preparation of the samplePrior to the test, the sample shall be heated to a temperature of 600 C 20 C for at least 10 min.4.3.4.2.3 Dispersion of the samplePlace a sufficie
49、nt amount of the sample in a test tube such that a height of 20 to 25 divisions in the collecting tube after sedimentation is obtained. For silicon carbide, this will be about 1,6 g; while for fused aluminium oxide it will be about 2,2 g.It is recommended that the dispersed sample be submitted to ultrasonic treatment to remove agglomerates.Transfer 15 ml of sedimentation medium containing the specified quantity of dispersing agent and the sample t
