1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Materials and articles in contact with foodstuffs Cutlery and table hollowarePart 9: Requirements for ceramic knives (ISO 8442-9:2018)BS EN ISO 8442-9:2018National forewordThis British Standard is the UK implementation
2、of EN ISO 8442-9:2018. It is identical to ISO 8442-9:2018.The UK participation in its preparation was entrusted to Technical Committee CW/17, Cutlery and table holloware.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purpor
3、t to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 87555 7ICS 67.250; 97.040.60Compliance with a British Standard cannot confer immunity from legal ob
4、ligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 8442-9:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 84429March 2018
5、ICS 67.250; 97.040.60EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCENCENELEC Management Centre: Avenue Marnix 17, B1000 Brussels 2018 CEN Ref. No. EN ISO 8442-9:2018: EAll rights of exploitation in any form and by any means reserved worldwide for
6、CEN national MembersMaterials and articles in contact with foodstuffs - Cutlery and table holloware - Part 9: Requirements for ceramic knives (ISO 8442-9:2018)Matriaux et objets en contact avec les denres alimentaires - Coutellerie et orfvrerie de table - Partie 9: Exigences relatives aux couteaux e
7、n cramiques (ISO 8442-9:2018)Werkstoffe und Gegenstnde in Kontakt mit Lebensmitteln - Schneidwaren und Tafelgerte - Teil 9: Anforderungen fr keramische Messer (ISO 8442-9:2018)This European Standard was approved by CEN on 10 March 2018.CEN members are bound to comply with the CEN/CENELEC Internal Re
8、gulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN me
9、mber.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 into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.C
10、EN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
11、 Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 84429:2018 (E)European forewordThis document (EN ISO 8442-9:2018) has been prepared by Technical Committee ISO/TC 186 “Cutlery and table and decorative metal hollow-ware” in co
12、llaboration with Technical Committee CEN/TC 194 “Utensils in contact with food” the secretariat of which is held by AFNOR.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 September 2018, and confli
13、cting national standards shall be withdrawn at the latest by September 2018.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.According to the CEN-CENEL
14、EC 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, Germany, Greece, Hungary, Ice
15、land, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 8442-9:2018 has been approved by CEN as EN ISO 8442-9:2018 without any m
16、odification.2BS EN ISO 8442-9:2018ISO 84429:2018Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Materials and construction . 25 Performance requirements . 25.1 Hardness of ceramic blades . 25.2 Sharpness and edge retention . 25.3 Impact resistance of inclined plane of cera
17、mic blades . 35.3.1 General 35.3.2 Apparatus . 35.3.3 Procedure . 35.4 Bonding strength of the coating and printing of ceramic blades 35.4.1 General 35.4.2 Apparatus . 35.4.3 Procedure . 35.5 Dishwasher safety 45.6 Resistance to thermal shock 46 Safety instructions 4Annex A (normative) Metallography
18、 examination 5Annex B (normative) Schematic diagram of impact resistance of inclined plane of ceramic blade 6Annex C (normative) Bonding strength test apparatus for the coating and printing of ceramic blade . 8Bibliography 9 ISO 2018 All rights reserved iiiContents PageBS EN ISO 8442-9:2018ISO 84429
19、:2018ForewordISO (the International Organization for Standardization) is a worldwide 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
20、 a technical committee has been established has the right to be represented on that 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 mat
21、ters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This do
22、cument was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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
23、such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and d
24、oes not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Tra
25、de (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 186, Cutlery and table and decorative metal hollow-ware.A list of all parts in the ISO 8442 series can be found on the ISO website.iv ISO 2018 All rights reservedBS EN ISO 8442-9:20
26、18Materials and articles in contact with foodstuffs Cutlery and table holloware Part 9: Requirements for ceramic knives (ISO 84429:2018)1 ScopeThis document specifies material and performance requirements and test method of ceramic blades of knives intended for use in the preparation of food.2 Norma
27、tive referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any ame
28、ndments) applies.ISO 3452-1, Non-destructive testing Penetrant testing Part 1: General principlesISO 8442-1, Materials and articles in contact with foodstuffs Cutlery and table holloware Part 1: Requirements for cutlery for the preparation of foodISO 8442-5, Materials and articles in contact with fo
29、odstuffs Cutlery and table holloware Part 5: Specification for sharpness and edge retention test of cutleryISO 14705, Fine ceramics (advanced ceramics, advanced technical ceramics) Test method for hardness of monolithic ceramics at room temperatureEN 12875-1, Mechanical dishwashing resistance of ute
30、nsils Part 1: Reference test method for domestic articlesEN 1183:1997, Materials and articles in contact with foodstuffs Test methods for thermal shock and thermal shock endurance3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain
31、terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at https:/www.iso.org/obp IEC Electropedia: available at http:/www.electropedia.org/3.1ceramic knifeknife for the preparation and serving of food, consisting of a ceramic blade wit
32、h cutting edge and handle3.2ceramic bladeblade made from all types of ceramic raw materialsINTERNATIONAL STANDARD ISO 84429:2018 ISO 2018 All rights reserved 1BS EN ISO 8442-9:2018ISO 84429:20184 Materials and construction4.1 Ceramic knives shall be made from materials that enable the finished produ
33、cts to meet all the performance requirements of this standard. The strength of ceramic blade, handle properties, and firmness of handle attachment shall meet the requirements of ISO 8442-1.4.2 The porosity of ceramic blade shall be less than or equal to 1,5 %. The maximum projected length of the max
34、imum pore (the maximum diameter of pore) shall be less than or equal to 25 m. The inclusion or structure defects (e.g. micro-cracks, non-uniform distribution of pores) shall not be observed in the view of the pores which are observed. The test method can be seen in Annex A.4.3 Ceramic blades shall n
35、ot show any cracks, pores, damages or other defects after being submitted to the penetrant test in accordance with ISO 3452-1.4.4 Ceramic knives shall not have any defects which may incur injuries during foreseeable use, such as deformation (distortion), deep scratches, cracks, burrs and chipping.4.
36、5 The cutting edge should be formed to an included angle no greater than 40 and should be no thicker than 0,46 mm when measured 1 mm from the extremity of the edge and not less than 25 mm from the handle.5 Performance requirements5.1 Hardness of ceramic bladesThe hardness of ceramic blades shall be
37、tested in accordance with ISO 14705 and the measurement points shall be tested in the areas “1, 2, 3” of the ceramic blade length and width trisection. At least one point shall be tested in each area. The test shall be carried out on a surface which is smooth, flat and free from foreign matter. The
38、surface shall be polished to permit accurate measurement of the diagonal lengths of the indentation. Preparation shall be carried out in such a way that any alteration of the surface hardness is minimized. The Vickers hardness value of each point shall be not less than 1 100 HV3, and all indentation
39、s shall be acceptable and shall not reveal micro-cracks. The measurement points for hardness of ceramic blades are shown in Figure 1.Figure 1 Measurement points for hardness of ceramic blades5.2 Sharpness and edge retentionThe sharpness z(3)shall be more than or equal to 60 mm, and the edge retentio
40、n z(30)shall be more than or equal to 300 mm. The test method shall be performed in accordance with ISO 8442-5.2 ISO 2018 All rights reservedBS EN ISO 8442-9:2018ISO 84429:20185.3 Impact resistance of inclined plane of ceramic blades5.3.1 GeneralThere shall not appear any chips or cracks on the cera
41、mic blade by visual observation after the test.5.3.2 ApparatusUse type D device of Leeb hardness tester according to ISO 16859-1 to impact the inclined plane of the blade.NOTE A schematic diagram of impact resistance test is shown in Annex B.5.3.3 Procedure5.3.3.1 Impact 3 points when the blade leng
42、th is less than 100 mm, impact 5 points when the blade length is more than or equal to 100 mm. The first impact position is 5 mm from the extremity of the tip, the second impact position is at the nearest location away from the handle, other positions are evenly distributed between the first and the
43、 second position; all the impact positions are 3 mm to 5 mm from the cutting edge.5.3.3.2 In the impact process, one inclined plane of ceramic blade shall be stuck to the surface of auxiliary device, the blade shall be stable, without any shake. The impact device of Leeb hardness tester shall be pos
44、itioned in normal direction to the inclined plane of the ceramic blade (impact in normal direction), impact one time for each point.5.4 Bonding strength of the coating and printing of ceramic blades5.4.1 GeneralCeramic blades coated and printed on the surface shall meet this requirement. In the proc
45、ess of abrasion test, the ceramic blade shall not expose the ceramic substrate, the coating or printing of the blade shall not fall off.5.4.2 ApparatusAn abrasive pad with a density of 180 kg/m3to 210 kg/m3, containing aluminium oxide particles with a grain size of P180, bonded to a rigid plastic bl
46、ock, suitably loaded to apply a total downward intensity of pressure 0,007 MPa to the pad (the size of the abrasive pad and the magnitude of load can be changed according to the size of the blade).NOTE 1 A suitable apparatus for the test is shown in Annex C.NOTE 2 The grain size P180 is cited from I
47、SO 6344-2:1998.5.4.3 Procedure5.4.3.1 Before the test, the blade surface shall be clean and dry.5.4.3.2 Mount the blade under test rigidly on to the reciprocating support and apply the loaded abrasive pad to the blade surface. Keeping the loaded abrasive pad stationary, move the reciprocating suppor
48、t backwards and forwards over a distance of (40 2) mm at an average speed of (6,5 0,2) m/min, continue for 250 cycles. Renew the abrasive pad at 50 cycle intervals. The test shall be performed in the dry condition.5.4.3.3 Remove the dust with a brush from the abraded surface and examine it for damag
49、e. ISO 2018 All rights reserved 3BS EN ISO 8442-9:2018ISO 84429:20185.5 Dishwasher safetyFor ceramic knives marked “Dishwasher safe”, a ceramic knife shall not show any damages or deformation or any visible changes when tested in accordance with the method described in EN 12875-1 after 125 cycles. The samples should be inspected every 25 cycles.5.6 Resistance to thermal shockCeramic blades shall not show any cracks or deformation or any visible changes after the test. Test according to test method B of EN 1183, th
