1、BS ISO 17493:2016Clothing and equipment forprotection against heat Test method for convectiveheat resistance using a hot aircirculating ovenBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 17493:2016 BRITISH STANDARDNational forewordThis British Standard is the
2、 UK implementation of ISO 17493:2016.It supersedes BS ISO 17493:2000 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PH/3/2, Heat and Flame Personal Protective Equipment.A list of organizations represented on this committee can be obtained on request t
3、o its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 79890 0 ICS 13.340.10 Compliance with a British Sta
4、ndard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 17493:2016 ISO 2016Clothing and equipment fo
5、r protection against heat Test method for convective heat resistance using a hot air circulating ovenVtements et quipement de protection contre la chaleur Mthode dessai de la rsistance la chaleur de convection au moyen dun four circulation dair chaudINTERNATIONAL STANDARDISO17493Second edition2016-1
6、2-15Reference numberISO 17493:2016(E)BS ISO 17493:2016ISO 17493:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by
7、any means, electronic or mechanical, including photocopying, 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 officeCh. de Blandonnet 8 CP 40
8、1CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 17493:2016ISO 17493:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Apparatus . 36 Specimens 47 Calibration of test oven 57.1 T
9、emperature and air velocity uniformity . 57.2 Daily 58 Procedures 58.1 Procedure for flat textile or other sheet materials 58.2 Procedure for protective gloves . 68.3 Procedure for protective footwear 68.4 Procedure for protective helmets and eye or face protection devices 78.5 Procedures for small
10、items and accessories on clothing 79 Test report . 8Annex A (normative) Temperature uniformity and time constant of hot air circulating oven . 9Bibliography .10 ISO 2016 All rights reserved iiiContents PageBS ISO 17493:2016ISO 17493:2016(E)ForewordISO (the International Organization for Standardizat
11、ion) 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 a technical committee has been established has the right to be r
12、epresented 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 matters of electrotechnical standardization.The procedures used to d
13、evelop 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 document was drafted in accordance with the editorial rules of the
14、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 such patent rights. Details of any patent rights identified durin
15、g 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 does not constitute an endorsement.For an explanation on the meani
16、ng 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 Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this doc
17、ument is ISO/TC 94, Personal safety Protective clothing and equipment, Subcommittee SC 13, Protective clothing.This second edition cancels and replaces the first edition (ISO 17493:2000), which has been technically revised with the following changes: the specifications for the apparatus have been im
18、proved and completed (5.1, 5.2, 5.4, new 5.5, 5.6, 5.7); procedures for the calibration of the test oven have been added (new Clause 7); a list of ASTM standards related to ISO 17493 is given in the Bibliography.iv ISO 2016 All rights reservedBS ISO 17493:2016ISO 17493:2016(E)IntroductionThis test m
19、ethod allows for the evaluation of the heat resistance of materials, protective clothing and equipment when suspended in a hot air circulating oven at a specified temperature of typically 180 C or 260 C for typically 5 min. Visible observations of charring, deformation, delamination, hole formation,
20、 ignition, melting of the specimen are recorded. The exposure in the hot air circulating oven may be used either for a visual evaluation only or as a pre-treatment for a material property measurement such as shrinkage or other property measurement which is not specified in this document. ISO 2016 Al
21、l rights reserved vBS ISO 17493:2016BS ISO 17493:2016Clothing and equipment for protection against heat Test method for convective heat resistance using a hot air circulating oven1 ScopeThis document describes a test method for evaluating the heat resistance of protective clothing materials or items
22、 and equipment when exposed in a hot air circulating oven. The method is intended to evaluate physical changes in a material at a given exposure temperature. Materials are evaluated for defined visible changes including the measurement of shrinkage.Different procedures are provided depending on the
23、type of the protective clothing material or item being tested.2 Normative 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 referen
24、ces, the latest edition of the referenced document (including any amendments) applies.ISO 3759, Textiles Preparation, marking and measuring of fabric specimens and garments in tests for determination of dimensional changeISO 3873, Industrial safety helmetsISO 4643:1992, Moulded plastics footwear Lin
25、ed or unlined poly(vinyl chloride) boots for general industrial use SpecificationIEC 60584-1, Thermocouples Part 1: EMF specifications and tolerances3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for u
26、se in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1charringresponse of the test specimen to heat evidenced by the formation of a carbonaceous residue3.2clothing assemblyseries
27、 of garments arranged in the order as wornNote 1 to entry: They may contain multilayer materials, material combinations, or a series of separate garments in single layers.3.3component assemblycombination of all materials and hardware (3.7) presented exactly as the finished garment constructionINTERN
28、ATIONAL STANDARD ISO 17493:2016(E) ISO 2016 All rights reserved 1BS ISO 17493:2016ISO 17493:2016(E)3.4deformationresponse of the test specimen to heat evidenced by a change in the shape of the test specimen that is irreversible at room temperatureNote 1 to entry: Shrinkage (3.12) is a form of deform
29、ation.3.5delaminationresponse of the test specimen to heat evidenced by separation into two or more layers, in whole or in part3.6equipmentfootwear, helmets, gloves, and eye or face protection devices3.7hardwarenon-fabric items forming part of or optional extras in a garmentEXAMPLE Metal or plastic
30、buttons or zippers and touch and close fasteners or hook and loop fasteners.3.8hole formationopening, break, or discontinuity of any size in the original structure of the test specimens fabric caused by application of heat3.9ignitionresponse of the test specimen to heat evidenced by initiation of co
31、mbustion3.10meltingresponse of the test specimen to heat evidenced by a change of state from solid to liquidNote 1 to entry: The practical observation of melting, as a material response at the end of the heat exposure, is to visually see evidence that the specimen has liquefied, in whole or in part,
32、 by displaying flow patterns or droplet formation.3.11separatingresponse of the test specimen to heat evidenced by splitting (3.13), delamination (3.5) or flaking3.12shrinkageresponse of the test specimen to heat evidenced by a decrease in one or more dimensions3.13splittingresponse of the test spec
33、imen to heat evidenced by breaking into two pieces, in whole or in part4 PrincipleSpecimens are suspended in a hot air circulating oven for 5 min at the specified test temperature. Any visible observations such as charring, deformation, degradation, delamination, embrittlement, flaking, hole formati
34、on, ignition, melting, separating, or splitting of the specimen are recorded. Shrinkage may also be measured. Specimens may also be subject to other property determinations following heat exposure.Observations of degradation, embrittlement, splitting, separating, or flaking can be considered as subj
35、ective and should not be used as a pass/fail criteria for a product standard.2 ISO 2016 All rights reservedBS ISO 17493:2016ISO 17493:2016(E)5 Apparatus5.1 Forced air circulating oven, capable of maintaining the test temperature over a period of 5 min and of sufficient internal volume to allow the t
36、est specimen (see Clause 6) to be suspended as specified in Clause 7.Testing shall be carried out at the test temperature specified in the referencing standard. If not specified otherwise, testing shall be carried out at a test temperature of (180 +80) C or (260 +80) C.The test oven shall be a horiz
37、ontal flow circulating oven with minimum interior dimensions such that the specimens can be suspended and be at least 50 mm from any interior oven surface or other test specimens.The test oven shall have an airflow rate of 0,5 m/s to 1,5 m/s at the standard temperature and pressure of 20 C at 1 atm,
38、 measured at the centrepoint of the oven.The test oven shall have the following temperature uniformity, when determined according to the procedure specified in A.1The maximum temperature deviation from the specified temperature levels at 260 C for each of the nine thermocouples shall be no greater t
39、han 6,5 C, and 180 C for each of the nine thermocouples shall be no greater than 4,5 C.NOTE 1 The above performance requirement for 260 C is equivalent to the requirement in ASTM F 2894-14 for the maximum temperature deviation specified in ASTM E 145 for IIB oven.The time constant of the oven, deter
40、mined according to the procedure of A.2 shall not exceed 660 s.NOTE 2 The above performance requirement is equivalent to the requirement in ASTM F 2894-14 for the time constant specified in ASTM E 145 for IIB oven.An oven sensing thermocouple shall be positioned so that it is level with the horizont
41、al centreline of a mounted sample specimen. The thermocouple shall be equidistant between the vertical centreline of a mounted specimen placed in the middle of the oven and the oven wall where the airflow enters the test chamber. The thermocouple shall be an exposed bead, Type J or K according to IE
42、C 60584-1, having a cross sectional area of 0,05 mm2(No. 30 AWG), or thermocouple with equivalent response time. The test oven shall be heated and the test thermocouple stabilized at the test temperature for a period of not less than 30 min.5.2 Rigid, square templates for sizing material specimensA
43、template measuring 375 mm 375 mm shall be used for sizing flat materials that are subject to shrinkage measurements.A template measuring 150 mm 150 mm may be used for flat materials that are not subjected to shrinkage measurements.For specimens (such as straps) narrower than 150 mm in one dimension,
44、 use specimens at their normal width by 150 mm in length. Suspend these specimens with their long axis in a vertical direction.5.3 Ruler, graduated in millimetres. ISO 2016 All rights reserved 3BS ISO 17493:2016ISO 17493:2016(E)5.4 Stretching frame for measuring shrinkage of knit materials.The frame
45、 shall be rigid and square having pins uniformly spaced, 25 mm apart, in a pattern measuring 325 mm2to secure knit materials before and after heat exposure. The stretching frame should be of a size on which the pins are located approximately 50 mm inward from the edge of the cut specimen size.NOTE T
46、he stretching frame is used before the knit specimen is placed in the oven for marking the specimen for shrinkage determination. The stretching frame is not used while the knit specimen is exposed to heat in the oven. The stretching frame is used again for a specified period of time after heat expos
47、ure in the oven to return the knit specimen to its original dimensions. The knit specimen is then removed from the frame and measured for shrinkage.5.5 Specimen mounting hardware.Metal hooks or clamps shall be used to suspend the specimens in the centre of the oven. If the specimen is too large to b
48、e suspended, an insulating platform can be used to support the specimen in the centre of the oven. Ceramic has been found to be a suitable platform material.5.6 Glass beads.Beads of nominal 4 mm size made of perforated soda lime or borosilicate glass.5.7 Headform.The head for testing of a helmet or
49、eye/face protection device shall be a non-conductive ISO Size K head as specified in ISO 3873.6 Specimens6.1 Material specimen preparation and conditioningSamples for conditioning shall be complete items of protective clothing or equipment or flat materials at least 1 m2.Condition the sample for at least 24 h in a standard atmosphere at (20 2) C and (65 5) % relative humidity.Mark and cut out a square specimen using the template (5.2). If the material or item for test is narrower than 375 mm, cut the s
