1、BRITISH STANDARDBS ISO 16232-6:2007Road vehicles Cleanliness of components of fluid circuits Part 6: Particle mass determination by gravimetric analysisICS 13.040.50; 43.180g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g5
2、1g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 16232-6:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 June 2007 BSI 2007ISBN 978 0 580 50923 0National forewordThis British Standard was published by BSI
3、. It is the UK implementation of ISO 16232-6:2007.The UK participation in its preparation was entrusted to Technical Committee MCE/22, Engines for road vehicles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to incl
4、ude 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. Amendments issued since publicationAmd. No. Date CommentsReference numberISO 16232-6:2007(E)INTERNATIONAL STANDARD ISO16
5、232-6First edition2007-06-01Road vehicles Cleanliness of components of fluid circuits Part 6: Particle mass determination by gravimetric analysis Vhicules routiers Propret des composants des circuits de fluide Partie 6: Dtermination de la masse de particules par analyse gravimtrique BS ISO 16232-6:2
6、007ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Principles. 1 5 Equipment and rinsing liquids 2 6 Environment conditions and precautions2 6.1 Work environment 2 6.2 Health and safety 3 7 Lower detection limit for gravimetric analy
7、sis 3 8 Preparing the apparatus 3 8.1 Conditioning of equipment 3 8.2 Preparing the membrane filters. 4 9 Procedure 4 9.1 Evaluation of the procedure 4 9.2 Liquid analysis procedure . 4 10 Reporting the results 5 10.1 Calculating the mass of contaminants. 5 10.2 Reporting of the level of contaminati
8、on of the component 5 11 Test report . 6 Annex A (informative) Example of standard gravimetric analysis report as per ISO 16232-6 . 7 Annex B (informative) Filtration 9 Bibliography . 10 BS ISO 16232-6:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation
9、 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 that committee.
10、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 accordance wit
11、h 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 requires approv
12、al 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 16232-6 was prepared by Technical Commit
13、tee ISO/TC 22, Road vehicles, Subcommittee SC 5, Engine tests. ISO 16232 consists of the following parts, under the general title Road vehicles Cleanliness of components of fluid circuits: Part 1: Vocabulary Part 2: Method of extraction of contaminants by agitation Part 3: Method of extraction of co
14、ntaminants by pressure rinsing Part 4: Method of extraction of contaminants by ultrasonic techniques Part 5: Method of extraction of contaminants on functional test bench Part 6: Particle mass determination by gravimetric analysis Part 7: Particle sizing and counting by microscopic analysis Part 8:
15、Particle nature determination by microscopic analysis Part 9: Particle sizing and counting by automatic light extinction particle counter Part 10: Expression of results BS ISO 16232-6:2007vIntroduction The presence of particulate contamination in a fluid system is acknowledged to be a major factor g
16、overning the life and reliability of that system. The presence of particles residual from the manufacturing and assembly processes will cause a substantial increase in the wear rates of the system during the initial run-up and early life, and may even cause catastrophic failures. In order to achieve
17、 reliable performance of components and systems, control over the amount of particles introduced during the build phase is necessary, and measurement of particulate contaminants is the basis of control. The ISO 16232 series has been drafted to fulfil the requirements of the automotive industry, sinc
18、e the function and performance of modern automotive fluid components and systems are sensitive to the presence of a single or a few critically sized particles. Consequently, ISO 16232 requires the analysis of the total volume of extraction liquid and of all contaminants collected using an approved e
19、xtraction method. The ISO 16232 series has been based on existing ISO International Standards such as those developed by ISO/TC 131/SC 6. These International Standards have been extended, modified and new ones have been developed to produce a comprehensive suite of International Standards to measure
20、 and report the cleanliness levels of parts and components fitted to automotive fluid circuits. BS ISO 16232-6:2007blank1Road vehicles Cleanliness of components of fluid circuits Part 6: Particle mass determination by gravimetric analysis 1 Scope The purpose of this part of ISO 16232 is to determine
21、 the mass of particulate contamination by gravimetric analysis. Contaminants are separated from the extraction liquid by filtration. It applies to automotive components in contact with a fluid. Unless otherwise specified, this part of ISO 16232 deals with particulate cleanliness only. It does not, t
22、herefore, cover appearance defects or contamination by liquid or gaseous materials. It covers the amount of residual particulate contaminants resulting from manufacturing processes and from the environment. 2 Normative references The following referenced documents are indispensable for the applicati
23、on of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 16232-1, Road vehicles Cleanliness of components of fluid circuits Part 1: Vocabulary ISO 16232-2, Road vehicles Cl
24、eanliness of components of fluid circuits Part 2: Method of extraction of contaminants by agitation ISO 16232-3, Road vehicles Cleanliness of components of fluid circuits Part 3: Method of extraction of contaminants by pressure rinsing ISO 16232-4, Road vehicles Cleanliness of components of fluid ci
25、rcuits Part 4: Method of extraction of contaminants by ultrasonic techniques ISO 16232-5, Road vehicles Cleanliness of components of fluid circuits Part 5: Method of extraction of contaminants on functional test bench ISO 16232-10, Road vehicles Cleanliness of components of fluid circuits Part 10: E
26、xpression of results 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 16232-1 apply. 4 Principles The total amount of extraction liquid used in extracting particulate contaminants from components in ISO 16232-2, ISO 16232-3, ISO 16232-4 or ISO 16232-5
27、 is filtered under either vacuum or pressure through one or more membrane filters. The number of filters is dependent on the mass of extracted contaminants. The mass difference in the membrane filter before and after the test is used to determine the mass of contaminants in the component. BS ISO 162
28、32-6:20072 5 Equipment and rinsing liquids 5.1 Membrane filters, 47 mm diameter or more, with a mean flow pore size (MFPS) of 5 m or different provided agreed on between parties, and made of a material compatible with the liquid to be analysed. The pore size shall be clearly stated in the test repor
29、t. 5.2 Membrane filter holder assembly suitable for the diameter of membrane filter chosen in 5.1. It can be made out of borosilicate, stainless steel or a suitable plastic. WARNING An earthing strap may have to be connected to the clamping device to dissipate any static charge generated during the
30、filtering process. NOTE In the ISO 16232 series, the words earthing and grounding are synonymous. 5.3 Vacuum flask of a volume suitable to hold the extraction liquid volume (e.g. 1 000 cm3) and with a fitting to a vacuum source. 5.4 Non-magnetic flat tweezers, able to handle membrane filter without
31、damaging them. 5.5 Petri dishes with covers to contain the membrane filter being used (see 5.1). These will normally be made of glass. 5.6 Precision balance with an accuracy of 0,1 mg or better (see 6). NOTE As an example: balances at 0,05 mg and 0,1 mg are adequate, a balance at 0,2 mg is not adequ
32、ate. 5.7 Controllable, non recirculatory oven capable of maintaining a temperature of 80 C 5 C or higher. WARNING Ensure that the membrane filters and any other material used in the oven contains negligible amounts of flammable liquids and the oven is operated below the flash point of any vapours. 5
33、.8 Device for obtaining a vacuum of approximately 85 kPa (gauge). 5.9 Desiccator containing desiccant substance. NOTE The desiccator should be placed close to the balance. 5.10 Rinsing liquid dispenser, with a suitable filter directly fitted at the outlet or filled with at least 0,8 m prefiltered li
34、quid and/or wash bottle (e.g. 1 000 cm3), clean, rinsed and filled with filtered (e.g. 0,8 micron) rinsing liquid. 5.11 All liquids used in the extraction and analysis process shall be compatible with the membrane filters and all the equipment materials. The liquids shall be sufficiently cleaned to
35、not have a significant effect on the results NOTE Details on equipment used should be agreed on between parties and reported in the inspection document. An example of a data sheet is given in Annex B. 6 Environment conditions and precautions 6.1 Work environment The cleanliness of the environment wh
36、ere the analysis is performed shall be consistent with the presumed cleanliness of the component to be tested. This is validated when performing the blank test (e.g. according to ISO 16232-2, ISO 16232-3, ISO 16232-4 or ISO 16232-5). NOTE Attention is drawn to the influence of humidity variations on
37、 the accuracy of the results. BS ISO 16232-6:200736.2 Health and safety 6.2.1 General Local Health and Safety procedures shall be followed at all times, any equipment shall be operated in accordance with the manufacturers instruction and personal protection equipment used where appropriate. 6.2.2 Ch
38、emicals used in the procedures can be harmful, toxic or flammable. Good laboratory practices shall be observed in the preparation and use of these chemicals. Care shall be taken to ensure compatibility of the chemicals with the materials used (refer to each Material Safety Data Sheet MSDS). Follow t
39、he precautions for safe handling and usage as described in the MSDS available from the supplier. 6.2.3 Volatile liquids: Care shall be taken with flammable liquids to ensure that they are used in accordance with the MSDS, at temperatures below the stated flash point and away from potential sources o
40、f ignition. Appropriate precautions should be taken to avoid inhalation of fumes from these solvents. Always use suitable protective equipment. 6.2.4 Electrical: Appropriate care should be applied in the use of electrical power. 6.2.5 Static: the build-up of electro-static charges (created by fricti
41、on as fluids flow) shall be dissipated and not be allowed to build- up where it can discharge and create a spark. An earthing strap shall be provided where there is a risk, especially for the vacuum where often volatile liquids are involved. 6.2.6 Disposal all liquids and substances shall be dispose
42、d of in accordance with local environmental procedures. In the event of spillage it shall be cleaned-up in the manner detailed in the MSDS. 7 Lower detection limit for gravimetric analysis Where objects are weighed using balance with an accuracy of at least 0,1 mg in rooms with uncontrolled conditio
43、ns as far as temperature and relative humidity are concerned, the lower detection limit is 1 mg. With a blank requirement of less than 10 % of the final mass, the residual mass (mF) shall be at least 10 mg in order for it to be accurately weighed. In practice, the possibility to analyse gravimetric
44、levels below 10 mg in an uncontrolled environment should not be excluded. In this case, blank values below 1 mg are acceptable to analyse a contaminant mass between 3 mg and 10 mg. Report the blank value as being “ 1 mg”. When using a five or six digit balance with an accuracy of at least 0,01 mg in
45、 rooms with controlled temperature and relative humidity, it is possible to detect blank values 1 mg. For this reason, analysis of a contaminant mass of 10 mg respecting the 10 % criterion is possible. For the case of very low gravimetric level, another alternative method of inspecting components co
46、uld be to increase the residual mass (mF) by performing extraction on several components simultaneously or by filtering the analysis liquid collected from several components through one membrane filter. 8 Preparing the apparatus 8.1 Conditioning of equipment Prepare clean filtration equipment, membr
47、ane filter holders, collection and rinsing vessels, tweezers and analysis equipment. The required cleanliness level of the equipment shall be such that the equipment will not contribute significantly to the overall result and shall be consistent with the presumed cleanliness of the component to be t
48、ested. BS ISO 16232-6:20074 8.2 Preparing the membrane filters 8.2.1 Remove one membrane filter (see 5.1) from its packaging using the tweezers (see 5.4) and carefully rinse its two sides with rinsing liquid. NOTE Rinsing the membrane filter is optional when a high weight of contaminant is presumed
49、to be measured. 8.2.2 Place the membrane filter on its holder (see 5.2). 8.2.3 Apply vacuum until the membrane filter is dry. 8.2.4 Release the vacuum, remove the membrane filter and place it in a Petri dish (see 5.5). 8.2.5 Place the Petri dish with its cover ajar in the oven (see 5.7) for the minimum period of time at the minimum temperature as determined in the validation procedure (e.g. 30 min at 80C). During this operation ensure that no contamination reaches the membrane filter. NOTE The drying time
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