1、BSI Standards PublicationBS EN 374-4:2013Protective gloves againstchemicals and micro-organismsPart 4: Determination of resistance todegradation by chemicalsBS EN 374-4:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 374-4:2013.The UK participation in its p
2、reparation was entrusted to TechnicalCommittee PH/3/8, Protective gloves.A list of organizations represented 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 correctappli
3、cation. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77775 2ICS 13.340.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committ
4、ee on 30 November 2013.Amendments issued since publicationDate Text affectedBS EN 374-4:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 374-4 November 2013 ICS 13.340.40 English Version Protective gloves against chemicals and micro-organisms - Part 4: Determination of resistance to degradat
5、ion by chemicals Gants de protection contre les produits chimiques et les micro-organismes - Partie 4: Dtermination de la rsistance la dgradation par des produits chimiques Schutzhandschuhe gegen Chemikalien und Mikroorganismen - Teil 4: Bestimmung des Widerstandes gegen Degradation durch Chemikalie
6、n This European Standard was approved by CEN on 28 September 2013. 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
7、 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 responsibility of
8、 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, Former Yugoslav Republic of Mac
9、edonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EU
10、ROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 374-4:2013 EBS EN 374-4:2013EN 374-4:2013 (E) 2 Contents Page Foreword 3 1 Scope 4 2
11、 Normative references 4 3 Terms and definitions .4 4 Test principles 4 5 Test methods, Puncture resistance test .4 5.1 Sampling .4 5.2 Apparatus .5 5.3 Procedure .5 5.3.1 Test conditions 5 5.3.2 Pre-testing measurements 5 5.3.3 Puncture testing.6 5.3.4 Expression of results 7 6 Test report 7 Annex A
12、 (informative) Inter laboratory test on the present test method .9 Annex B (informative) Weight change test 10 B.1 General . 10 B.2 Sampling 10 B.3 Apparatus 10 B.4 Procedure 10 B.4.1 Measurements . 10 B.4.2 Test conditions . 10 B.4.3 Procedure 10 B.4.4 Calculation . 11 B.4.5 Expression of results .
13、 11 B.5 Test report . 11 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 89/686/EEC . 13 BS EN 374-4:2013EN 374-4:2013 (E) 3 Foreword This document (EN 374-4:2013) has been prepared by Technical Committee CEN/TC 162 “Protective clothi
14、ng including hand and arm protection and lifejackets”, 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, at the latest by May 2014 and conflicting national standards shall be
15、 withdrawn at the latest by May 2014. 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 all such patent rights. This document has been prepared under a mandate
16、given to CEN by the European Commission and the Eu-ropean Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. EN 374 consists of the following parts under the gene
17、ral title, Protective gloves against chemicals and micro-organisms: Part 1: Terminology and performance requirements; Part 2: Determination of resistance to penetration; Part 3: Determination of resistance to permeation by chemicals; Part 4: Determination of resistance to degradation by chemicals. A
18、ccording 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, Former Yugoslav Republic of Macedonia, France, Germ
19、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 374-4:2013EN 374-4:2013 (E) 4 1 Scope This European Standard specifies the test me
20、thod for the determination of the resistance of protective glove materials to degradation by dangerous chemicals with continuous contact. NOTE Annex A gives information on interlaboratory test results on this method. Other tests used to evaluate chemical resistance such as permeation resistance and
21、penetration resistance may not provide sufficient information on the physical property changes affecting a glove during exposure to a chemical. It is necessary that the outside surface of the glove be exposed to the chemical. 2 Normative references The following documents, in whole or in part, are n
22、ormatively 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. EN 374-1:2003, Protective gloves against chemicals and mic
23、ro-organisms - Part 1: Terminology and perfor-mance requirements EN 388:2003, Protective gloves against mechanical risks EN 420:2003+A1:2009, Protective gloves - General requirements and test methods 3 Terms and definitions For the purposes of this document, the terms and definition given in EN 374-
24、1:2003 and EN 420:2003+A1:2009 apply. 4 Test principles The resistance of a protective glove material to degradation by a liquid chemical is determined by measuring the puncture resistance change of the glove material after a continuous contact with the external surface with the challenge test chemi
25、cal. The test is applicable to gloves made of natural or synthetic polymer. Lined gloves may produce unusable measurement results. 5 Test methods, Puncture resistance test 5.1 Sampling Select three gloves for testing. Condition the gloves at (23 2) C, (50 5) % relative humidity for at least 24 hours
26、. In the case of irregular and/or multiple construction, one sample shall be tested from each area. Using the appropriate circular die of 20 mm, cut 6 specimens of each glove for a total of 18 test specimens. For each glove, 3 specimens will be exposed to the challenge chemical and 3 specimens will
27、be unexposed. Select specimens so that they are homogeneous and representative of the gloves primary construction. Avoid embossed patterned areas or other areas of varying thickness or composition when cutting these specimens. If a glove is constituted of several unbounded layers, only the layer giv
28、ing the chemical protection shall be tested. The sample shall be tested according to the method described in 5.3. An additional non-mandatory informative test method is given as an example in Annex B. BS EN 374-4:2013EN 374-4:2013 (E) 5 For lined gloves, if it is not possible to separate the liner f
29、rom the glove (and if the liner is too thick), the test may not be feasible, because it is not possible to seal the vial and the sample is moving. For certain samples, if there is a thick liner, it may not be necessary to use the septa to have a correct vial sealing. In this case, the liner will ens
30、ure the leakproofness. 5.2 Apparatus The following equipment shall be used: a) (20 1) mm diameter cutting die; b) (12 1) mm diameter cutting die (for cutting a hole to the centre of each septum); c) 20 ml crimp top vials (opening (12,5 0,5) mm of diameter); d) 20 mm diameter septa (e.g. made from ch
31、lorobutyl rubber without polytetrafluoroethylene (PTFE) layer); e) 20 mm open centre aluminium crimp seals; f) hand crimper; g) hand decapper; h) samples holder with 18 holes of 20 mm diameter; i) 150 ml beaker; j) transfer pipette, 2 ml; k) dynamometer with a puncture stylus according to EN 388:200
32、3, 6.4 and a cell to measure compression forces with a precision of 1 %; l) sample vial support. 5.3 Procedure 5.3.1 Test conditions The test shall be conducted at (23 2) C (preparation, chemical, time exposure to chemical, puncture test). 5.3.2 Pre-testing measurements Place the challenge chemical
33、into the 150 ml beaker. Using the transfer pipette, place about 2 ml of challenge chemical into one of the crimp top vials. Seat a septum in an open centre aluminium crimp seal cap. Using the (12 1) mm cutting die, make a centred hole in the septum. Place a glove specimen on top of the septum with i
34、ts normal external surface facing towards the interior of the vial. Place the aluminium cap with the sample on top of the vial. Seal the vial using the hand crimper and invert it so that the challenge chemical is in contact with the specimen (see Figure 1). Record the time. Place the vial in the pun
35、ched-out sample holder. NOTE The punched-out sample holder has a twofold purpose. 1) It allows air to circulate under the sample film, and 2) if the pressure from the challenge chemical forces the sample into a convex shape, the flask will still stand. BS EN 374-4:2013EN 374-4:2013 (E) 6 Repeat the
36、procedure in the above paragraph for each of the remaining eight specimens that are to be exposed. Time these actions so that the exposures on succeeding specimens begin at three-minute intervals. At the end of the one-hour exposure period (5 min), examine each test vial to confirm coverage of the s
37、pecimen with the challenge chemical. If the chemical is not covering the specimen, discard the specimen and repeat the test using a larger quantity of challenge chemical. Mount the nine unexposed specimens in the remaining vials in the same manner, except that no chemical is placed in the vial. Key
38、1 challenge chemical 2 outer surface of the glove sample which is in contact with the challenge chemical, it is a circular area of (12,5 0,5) mm diameter Figure 1 Position of the vial during contact time between the sample and the dangerous chemical Key 1 20 ml crimp vial 2 puncture stylus 3 sample
39、4 vial carrier (to be maintain by the dynamometre jaw) Figure 2 Position of the vial during puncture test 5.3.3 Puncture testing Install the puncture stylus on the dynamometer load cell. Set the carriage speed to 100 mm/min and screw the vial support onto the table. Place a vial into the support. Pu
40、ncture the specimen and record the peak force required (see Figure 2). BS EN 374-4:2013EN 374-4:2013 (E) 7 Repeat for each of the specimens; test each of the exposed specimens one hour after the exposure on that specimen was started. Test specimens shall be examined for any changes to their physical
41、 properties during and after the test (after drying). Any changes such as swelling, shrinking, brittleness, hardening, softening, flaking, disintegration, colour change/bleeding, delaminating shall be noted and described on the test report for information. 5.3.4 Expression of results Determine the d
42、egradation for each of the three glove specimens against each specific chemical or chemical mixture using the formula: 100(OPx - RPx)DRx X OPx=(1) where DRx is the degradation of the x glove specimen against challenge chemical tested, in %; OPx is the average puncture force on the three unexposed te
43、st specimens from the x glove specimen; units shall be same as RPx; RPx is the average puncture force on the three exposed test specimens from the x glove specimen; units shall be same as OPx . Determine the degradation of the sample against the challenge chemical using the following Formula (2): 33
44、21 )DRDR(DRDR+= (2) where DR is the degradation of the test sample against challenge chemical tested, in %; 1DR is the degradation of the first glove specimen against challenge chemical tested, in %; 2DR is the degradation of the second glove specimen against challenge chemical tested, in %; 3DR is
45、the degradation of the third glove specimen against challenge chemical tested, in %. Determine the standard deviation (SD) of the degradation for the three gloves. 6 Test report For each protective glove material tested, a report shall include the following information: a) Report the manufacturers r
46、eference for the glove tested including the material, style, and lot number. b) Report the name of the test chemical, its purity, and if it is in a mixture, its concentration and other components. c) Make reference to this European Standard. d) Report the date of the test. BS EN 374-4:2013EN 374-4:2
47、013 (E) 8 e) Report DR1, DR2, DR3, DR (see 5.3.4), the percent change in the puncture for the glove material. The SD shall also be reported. f) Report whether the liner, if present, has been separated from the test specimen. g) Report any observations of changes in the physical appearance of the mat
48、erial specimens following chemical exposure. Examples of reported observations are swelling, shrinking, brittleness, hardening, softening, flaking, disintegration, colour change/bleeding and delaminating. h) Any deviation to this European Standard shall be reported. BS EN 374-4:2013EN 374-4:2013 (E)
49、 9 Annex A (informative) Inter laboratory test on the present test method The following degradation data have been obtained in a collaborative correlation trial on by several laboratories, using the test method described in Clause 5. Table A.1 Results in % of correlation trial with natural rubber gloves (thickness 0,6 mm) Laboratory Ethyl acetate Heptane Mean value Standard deviation Mean value Standard deviation 1 43 6,8 66 4,0 2 37 10 61 7,0 3 36 5,9 47 1,6 4 39 4,5 49 2,8 5 40 5,3 56 6,1 6 32 2,8 51 8,1 7 - - 56 2,4 Mean value 37,8 5,9
