《BS-ISO-17493-2000.pdf》由会员分享,可在线阅读,更多相关《BS-ISO-17493-2000.pdf(14页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS ISO 17493:2000 Clothing and equipment for protection against heat Test method for convective heat resistance using a hot air circulating oven ICS 13.340.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 2
2、6 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 17493:2000 This British Standard, having been prepared under the direction of the Health and Environment Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 08-2001 ISB
3、N 0 580 38054 8 National foreword This British Standard reproduces verbatim ISO 17493:2000 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee PH/3, Protective clothing, to Subcommittee PH/3/2, Clothing for protection against he
4、at and flame, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue
5、 under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their corre
6、ct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests info
7、rmed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, page ii and iii, a blank page, pages 1 to 6, an inside back cover and a back cover. The BSI copyright date d
8、isplayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 17493:2000(E) INTERNATIONAL STANDARD ISO 17
9、493 First edition 2000-12-01 Clothing and equipment for protection against heat Test method for convective heat resistance using a hot air circulating oven Vtements et quipement de protection contre la chaleur Mthode dessai de la rsistance la chaleur de convection au moyen dun four circulation dair
10、chaud Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 17493:2000(E) iii Foreword ISO (the International Organization for Standa
11、rdization) 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 t
12、o 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 matters of electrotechnical standardization. International Sta
13、ndards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies
14、casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 17493 was prepared by Technical Committee IS
15、O/TC 94, Personal safety Protective clothing and equipment, Subcommittee SC 13, Protective clothing. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncont
16、rolled Copy, (c) BSI INTERNATIONAL STANDARDISO 17493:2000(E) 1 Clothing and equipment for protection against heat Test method for convective heat resistance using a hot air circulating oven 1Scope This International Standard describes a test method for evaluating the heat resistance of protective cl
17、othing materials or items 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 visible changes or subjected to a material property measurement following heat exposure.
18、This test method also enables the measurement of shrinkage that occurs as a result of the heat exposure. Different procedures are provided depending on the type of the protective clothing material or item being tested. 2Normative references The following normative documents contain provisions which,
19、 through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possib
20、ility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 139:1973, Textiles Standard atmos
21、pheres for conditioning and testing. ISO 3759:1994, Textiles Preparation, marking and measuring of fabric specimens and garments in tests for determination of dimensional change. ISO 3873:1977, Industrial safety helmets. ISO 4643:1992, Moulded plastics footwear Lined or unlined poly(vinyl chloride)
22、boots for general industrial use Specification. 3Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 charring formation of a carbonaceous residue when material is exposed to thermal energy 3.2 clothing materials worn by a person, incl
23、uding textile and other sheet materials, accessories such as slide fasteners and hook and loop fasteners, bands, reflective tapes and small whole items such as gloves 3.3 embrittlement formation of a brittle residue when material is exposed to thermal energy Licensed Copy: sheffieldun sheffieldun, n
24、a, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 17493:2000(E) 2 3.4 equipment footwear, helmets and eye or face protection devices 3.5 ignition initiation and continuation of combustion 3.6 melt respond to heat by flowing or dripping 3.7 separate respond to heat by splitting, d
25、elamination or flaking 3.8 shrinkage a decrease in one or more dimensions of an object or material 4Principle Specimens are suspended in a hot air circulating oven for 5 min at the specified test temperature. Any ignition, melting, dripping, separation or shrinkage of the specimen is recorded. Speci
26、mens may also be subject to other property determinations following heat exposure. 5Apparatus 5.1Forced air circulating oven, capable of maintaining the test temperature over a period of 5 min and of sufficient internal volume to allow the test specimen (see clause 6) to be suspended as specified in
27、 clause 7. Testing shall be carried out at the test temperature specified in the referencing standard. If not specified, testing shall be carried out at a test temperature of (185 ? 5) C or (260 ? 5) C. The test oven shall be a horizontal flow circulating oven with minimum interior dimensions such t
28、hat 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, measured at the centre-point of the oven. A test thermocouple sha
29、ll be positioned so that it is level with the horizontal 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
30、 shall be an exposed bead, Type J or K, 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. 5.2Rigid, square template for material specimens, measuring 375 mm?375 m
31、m. A small template measuring 150 mm?150 mm may be used for materials that are not subjected to shrinkage measurements. For specimens (such as straps) narrower than 150 mm in one dimension, use specimens at their normal width by 150 mm in length. Suspend these specimens with their long axis in a ver
32、tical direction. 5.3Ruler, graduated in millimetres. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 17493:2000(E) 3 5.4Stretching frame for knit materials, consisting of a board with uniformly spaced pins along the perimeter (at interva
33、ls of 25 mm) to 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. 6Specimens 6.1Material specimen preparation and conditioning Condition the material for at l
34、east 24 h in a standard atmosphere at (20?2) C and (65?5) % relative humidity in accordance with ISO 139. 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 specimen 375 mm in the direction of its length and turn the specime
35、n so as this edge serves as the width. If the item for test is less than 375 mm?375 mm, test the complete item. As indicated in 5.2, the specimen may be of reduced size (using a template of 150 mm ? 150 mm) when the specimens are not subjected to measurement of shrinkage. Test a minimum of three spe
36、cimens. 6.2Glove, footwear, helmet and eyewear specimen preparation and conditioning Small items of protective clothing or equipment may be tested whole such as gloves, footwear, helmets or eyewear, as long as the oven specifications specified in 5.1 are met. A minimum of three different items shall
37、 be tested. Condition these items for at least 24 h in a standard atmosphere at (20?2) C and (65?5) % relative humidity. 7Procedures 7.1Procedure for flat textile or other sheet materials Mark and measure specimens in accordance with the procedures specified in ISO 3759. Turn on the oven and heat to
38、 test temperature. Allow the oven to stabilize at the test temperature for a minimum of 30 min. Suspend the specimen by metal hooks at the top and centred in the oven so that the entire specimen is not less than 50 mm from any oven surface or other specimen, and airflow is parallel to the plane of t
39、he material. Do not open the oven door for more than 15 s. Shut off the air circulation while the door is open and turn the air circulation on when the door is closed. The total oven recovery time after the door is closed shall not exceed 30 s. Expose the specimen, mounted as specified, in the test
40、oven for 0,15 0 5 ? min. The test exposure time shall begin when the test thermocouple recovers to the test temperature 5 0 t ?oC. Immediately after the specified exposure, remove the specimen and examine it for evidence of charring, embrittlement, ignition, melting or separation. Five minutes after
41、 the specified exposure, where required, measure the specimens marked dimensions to determine percentage shrinkage in both main directions. Using the stretching frame (5.4), pull knit fabric specimens to their original dimensions for 10 min, then remove the specimens from the frame, and allow the sp
42、ecimens to relax for 10 min prior to measurement to determine pass/fail. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 03:42:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 17493:2000(E) 4 If, in stretching knit fabric specimens, the specimens break or cannot be stretched to the original
43、dimensions, then this observation shall be reported in lieu of the measured shrinkage. Subject heat-exposed specimens to other evaluations as required. 7.2Procedure for protective gloves Measure the glove length from the tip of the middle finger to the end of the glove body on the palm side. Measure
44、 the glove width on the palm side 25 mm below the base of the fingers. Turn on the oven and heat to test temperature. Allow the oven to stabilize at the test temperature for a minimum of 30 min. Fill the glove body with dry vermiculite, clamp the opening of the glove together and suspend the specime
45、n in the clamp in the oven so that the entire glove is not less than 50 mm away from any oven surface or other specimen, and airflow is parallel to the plane of the glove palm. Do not open the oven door for more than 15 s. Shut off the air circulation while the door is open and turn the air circulat
46、ion on when the door is closed. The total oven recovery time after door is closed shall not exceed 30 s. Expose the specimen, mounted as specified, in the test oven for 0,15 0 5 ? min. The test exposure time shall begin when test thermocouple recovers to the test temperature 5 0 t ?oC. Immediately a
47、fter the specified exposure, remove the specimen and examine it for evidence of charring, embrittlement, ignition, melting or separation. Five minutes after the specified exposure, remove the vermiculite and remeasure the glove length and width as indicated above to determine the percentage shrinkag
48、e in each direction. Have a test subject, whose hands are of suitable dimensions for the tested gloves, don the gloves before the exposure to check the size. The test subject shall then don the exposed gloves 15 min after the heat exposure and flex the gloves a total of 25 times by clenching and unc
49、lenching the hands repeatedly into a fist. Record any changes in the gloves as a result of heat exposure and flexing. 7.3Procedure for protective footwear Turn on the oven and heat to test temperature. Allow the oven to stabilize at the test temperature for a minimum of 30 min. Fill the footwear with dry vermiculite, fasten all closures, and position the footwear in the exact centre of the oven, using a non-conductive stand in the centre of the oven or oven rack (with the toe of the footwear facing the oven door). Ensure that the footwear item is not les
链接地址:https://www.31doc.com/p-3746983.html