1、BRITISH STANDARDBS EN 4158:2006Aerospace series Paints and varnishes Test method for measurement of electrical surface resistance of conductive layersThe European Standard EN 4158:2006 has the status of a British StandardICS 49.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g
2、40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 4158:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2007 BSI 2007ISBN 978 0 580 50070 1Na
3、tional forewordThis British Standard was published by BSI. It is the UK implementation of EN 4158:2006. The UK participation in its preparation was entrusted by Technical Committee ACE/65, Non-metallic materials for aerospace purposes (excluding textiles), to Panel ACE/65/-/4, Surface finish and pro
4、tective treatments.A list of organizations represented on ACE/65/-/4 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer
5、 immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 4158December 2006ICS 49.040English VersionAerospace series - Paints and varnishes - Test method formeasurement of electrical surface resistance of conductivelay
6、ersSrie arospatiale - Peintures et vernis - Mesure de larsistance de surface lectrique des couches conductriceLuft- und Raumfahrt - Anstrichstoffe - Messen deselektrischen Oberflchenwiderstandes von elektrischleitfhigen SchichtenThis European Standard was approved by CEN on 28 August 2006.CEN member
7、s are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application t
8、o the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same st
9、atus as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia,
10、Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN
11、national Members.Ref. No. EN 4158:2006: E2 Contents Page Foreword3 1 Scope 4 2 Principle4 3 Apparatus .4 4 Test specimens6 5 Procedure .6 6 Results 8 7 Designation 8 8 Test report 8 Bibliography 9 EN 4158:20063 Foreword This document (EN 4158:2006) has been prepared by the Aerospace and Defence Indu
12、stries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation
13、to CEN. 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 June 2007, and conflicting national standards shall be withdrawn at the latest by June 2007. Attention is drawn to the possibility that some
14、 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to imple
15、ment this European Standard: Austria, Belgium, Cyprus, Czech Republic, 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 Un
16、ited Kingdom. EN 4158:20064 1 Scope This standard describes a method of measurement of the electrical resistance of electrically conducting surface coatings on non-conductive parts and samples for aerospace applications. If electrical contact areas are provided, the method is also applicable on elec
17、trical conducting layers over coated with non-conducting layers. 2 Principle The principle of the method involves applying a known voltage U to the conductive layer, measuring the current I, and calculating the resistance Rmeasuredaccording to Ohms law: Rmeasured= IUThe resistance of the layer RLcan
18、 be calculated under the following assumptions (see Figure 1): homogeneous distribution of conducting particles in the layer layer thickness 3,5 d dimensions of sample under test 5 a inner resistance of electrodes, cables, and contact resistance between electrodes and surface of the sample are negli
19、gible. Then LR =daIn2 Rmeasured(1) 3 Apparatus 3.1 Fixed Electrode Set up The assembly of electrodes consists of an electrode support made from an insulate, made up of two electrodes of conductive silicone elastomer as well as the connections to the measuring apparatus (see Figure 1). EN 4158:20065
20、Data to the assembly of electrodes according to Figure 1: Material: silicone elastomer, conductive Diameter (d): 4 mm Distance from centre to centre of the electrodes (a): (50500,) mm Protrusion to the support (h): (4 1) mm Supporting surface: plane Contact resistance: 0,2 Insulating resistance of t
21、he electrode support: minimum 1010 Key 1 Cable connections towards measuring apparatus 2 Electrode support in dielectric material 3 Electrodes made from conductive elastomer Figure 1 Assembly of electrodes NOTE The result of equation (1) is with this geometry: RL= 4100In Rmeasured= 23, Rmeasured= Rm
22、easured3.2 Electrical instruments Ohmmeters or multimeters with the ohmic measuring range at least corresponding to the expected value shall be used. These instruments are customary in trade from several companies: The instruments shall be controlled and calibrated regularly. 2 13 EN 4158:20066 4 Te
23、st specimens The specimens or parts shall be coated with an electrically conductive paint. The size of the parts shall be not smaller than 300 mm 300 mm. If measurements on samples additionally coated with non-conducting paints are required, contact areas have to be provided. For that purpose areas
24、with a diameter of 10 mm and with a centerto-center distance of 50 mm must be protected with a foil which cannot be penetrated by components of the non-conductive paints. 5 Procedure 5.1 Measuring conditions Measurements shall be performed after complete curing of the electrically conductive paint.
25、The ambient temperature and relative air humidity should be between 15 C and 35 C and less than 70 % respectively. 5.2 Examination of the assembly of electrodes The assembly of electrodes is connected to the measuring apparatus. Depending on the electrical surface resistance to be measured, the meas
26、uring range and the corresponding direct voltage of measurement are to be adjusted. The functioning of the assembly of electrodes is controlled by pressure on an uncoated piece of metal (i.e. copper sheet with an electrical surface resistance 100 mm and flat components 1 EN 4158:20068 6 Results If t
27、he measurements have not been performed with the fixed electrode set up described in 3.1 the resistance of the conductive paint RLshall be calculated from: LR =daIn2 Rmeasuredwhere a is the center-to-center distance of electrodes; d is the diameter (contact area) of electrodes; Rmeasuredis the measu
28、red resistance. 7 Designation EXAMPLE Description block MEASUREMENT OF ELECTRICAL RESISTANCE Identity block EN4158 Number of the standard 8 Test report When reference is made to this standard, the test report shall contain the following information: a) nature of the conductive layer, in case of cond
29、uctive paints exact designation according to the data sheet, manufacturers trade mark, manufacturing number, as well as the operating procedure of the user; b) in case of conductive paints, the drying time and temperature until the surface resistance test; c) designation and nature of the measuring
30、apparatus; d) center-to-center distance of electrodes and diameter of electrodes (if necessary); e) measuring range; f) number of the measuring points, if necessary by means of a measuring point draft; g) single measuring values according to the measuring point or the arithmetical medium value from
31、all measuring values according to the requirements of the agreement; h) deviations form this standard; i) date of the test and signature of the examiner. EN 4158:20069 Bibliography 1 ISO 1513, Paints and varnishes Examination and preparation of samples for testing. 2 ISO 3696, Water for analytical l
32、aboratory use Specification and test methods. EN 4158:2006BS EN 4158:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international lev
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