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1、BRITISH STANDARD BS 7193:1989 Incorporating Amendment No. 1 Specification for Lined lightweight rubber overshoes and overboots Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 This British Standard,
2、 having been prepared under the direction of the Rubber Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 March 1990 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference RUM/7 Draft for comment 8
3、7/44516 DC ISBN 0 580 17769 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Rubber Standards Policy Committee (RUM/-) to Technical Committee RUM/7, upon which the following bodies were represented: Association of County Councils Associ
4、ation of Metropolitan Authorities British Fire Services Association British Footwear Manufacturers Federation British Rubber Manufacturers Association Chief and Assistant Chief Fire Officers Association Department of Health and Social Security Engineering Equipment and Materials Users Association Ho
5、me Office Institution of Fire Engineers Malaysian Rubber Producers Research Association Ministry of Defence RAPRA Technology Ltd. SATRA Footwear Technology Centre Tropical Growers Association Amendments issued since publication Amd. No.Date of issueComments 6606December 1990 Indicated by a sideline
6、in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 BSI 09-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Fabrics1 4Minimum thickness1 5Rei
7、nforcements2 6Physical properties of soling2 7Electrical requirements for conducting and antistatic footwear2 8Marking2 9Labelling3 Appendix A Method of preparation and test for fabrics6 Appendix B Method of measuring thickness of upper6 Figure 1 Component parts of the footwear4 Table 1 Minimum coat
8、ed fabric strengths for lightweight overshoes and overboots1 Table 2 Tensile strength and elongation at break of outsole2 Table 3 Tensile strength and elongation at break after ageing of outsoles2 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Ban
9、k University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 ii BSI 09-1999 Foreword This British Standard has been prepared under the direction of the Rubber Standards Policy Committee. It is a revision of BS 5451:1977. The remainder of the BS 5451:1977 specification de
10、aling with boots with defined electrical properties is now contained in BS 5145:1989. On publication of the revisions of both standards, BS 5451:1977 will be withdrawn. NOTEThis revision has been published under a new BS number in order to avoid confusion with BS 5145. Electrically conducting lightw
11、eight rubber overshoes and overboots should be used if it is necessary to minimize electrostatic build up by dissipating electrostatic charges in the shortest possible time, e.g. when handling explosives, and where risk of electric shock from any electrical apparatus has been completely eliminated.
12、In order to ensure that the footwear is definitely conducting, an upper limit of resistance of 1.5 1057 is specified. Antistatic lightweight rubber overshoes and overboots should be used if it is necessary to minimize electrostatic build-up by dissipating electrostatic charges in situations where po
13、rtable electrical equipment may be used or where electrical defects from other causes may develop. In such application it is necessary to ensure a minimum value of resistance to protect against a severe electric shock or ignition of the rubber. Experience has shown that for antistatic purposes the d
14、ischarge path through a product should normally have an electrical resistance of less than 1087 at any time throughout its useful life. A value of 7.5 1047 is specified as the lowest limit of resistance of a product when new, in order to ensure adequate protection against dangerous electric shock or
15、 ignition in the event of any electrical apparatus becoming defective when operating at voltages up to 250 V. During service the electrical resistance of overshoes and overboots made from conducting or antistatic material may change significantly due to flexing and contamination. It is therefore nec
16、essary to ensure that the product is capable of fulfilling its desired function of dissipating electrostatic charges and also of giving any desired protection during the whole of its life. The user is therefore recommended to carry out the test for electrical resistance at regular and frequent inter
17、vals. If in doubt, the manufacturer should be consulted for frequency of testing. In a building where conducting or antistatic overshoes and overboots are in use, the resistance of the flooring should be such that it does not invalidate the protection against electric mains shock or static electrici
18、ty provided by the footwear. A specification for conducting flooring is given in BS 3187. WARNING. In use, no insulating element should be introduced between the inner side of the overshoes and overboots and the foot of the wearer. A British Standard does not purport to include all the necessary pro
19、visions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6,
20、an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17
21、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 BSI 09-19991 1 Scope This British Standard specifies requirements for lined lightweight rubber overshoes and overboots with defined electrical properties. NOTEThe titles of the publications referred to in this standard are listed on the inside
22、 back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 backstrip internal or external strip of fabric or rubber covering the back centre line of the overshoe or overboot 2.2 top binding narrow strip of rubber or other material along the top of the o
23、vershoe or overboot to give a finished appearance 2.3 counter a) Heel area of the upper. b) Reinforcement for stiffening the heel area of the upper. 2.4 filler material used to fill any cavity between insole and outsole 2.5 foxing strip reinforcement strip to protect the bottom edge of the upper 2.6
24、 heel piece internal reinforcement for stiffening the heel counter area 2.7 insole bottom inside component of the overshoe or overboot adjacent to the bottom of the foot 2.8 outsole bottom outside component providing the walking surface of the overshoe or overboot 2.9 toecap external reinforcement o
25、f the overshoe or overboot upper in the toe area 2.10 upper that part of the overshoe or overboot above the outsole covering the foot and leg NOTEThe illustrations in Figure 1 show the general locations of parts, not all of which are necessarily included in the construction or implied in the specifi
26、cation, and are intended to combine the features of different styles. In the case of moulded overboots, the terms indicate a particular area of the overboot, rather than a separate part. 3 Fabrics The lining of an overshoe or overboot shall consist of one or more plies of fabric(s) forming the leg a
27、nd vamp lining. They shall be free from such defects as would detract from the serviceability of the finished product. When tested in accordance with Appendix A, the strength of the one fabric, or the composite strength if more than one fabric, shall be as given in Table 1. Table 1 Minimum coated fa
28、bric strengths for lightweight overshoes and overboots 4 Minimum thickness 4.1 Upper and foxing strip When determined as described in Appendix B, the combined thickness of rubber and fabric shall be not less than 0.75 mm at any point round the top circumference, ignoring any of the top binding, and
29、not less than 1.5 mm at any point round the foxing strip. 4.2 Soling 4.2.1 Minimum thickness. The minimum thickness of soling shall not be less than 2.5 mm at any point when measured in accordance with 4.2.2. 4.2.2 Method of measurement of soling thickness. Cut the overboot or overshoe through the c
30、entre of the sole longitudinal and perpendicular to the surface. Measure the thickness of the sole over any pattern from the lower surface of the filler at three widely separated points along the cut, using a graduated eyepiece with 0.1 mm scale spacing. Type of fabric Breaking strength per 25 mm wi
31、dth Along the length of material Across the breadth of material NN Woven250250 Knitted180180 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 2 BSI 09-1999 5 Reinforcements The top of an overshoe or
32、 overboot shall be finished off by a binding or other suitable means. NOTEEyelets, if fitted, should be resistant to corrosion and should be securely fixed. 6 Physical properties of soling 6.1 Tensile and elongation requirements before ageing The outsole shall be reduced to sheets or pieces in accor
33、dance with the method described in BS 5131-2.7. The sheets or pieces shall be of sufficient size and thickness to be able to stamp a maximum of ten type 1 or type 2 dumb-bell test pieces as specified in BS 903-A2. The tensile strength and elongation at break of the test pieces shall then be determin
34、ed in accordance with BS 903-A2. The type of dumb-bell test piece used shall be stated when quoting results. Three test pieces shall be tested and the median value of the three test results shall be in accordance with the values given in Table 2. If the median of the results is below, and the highes
35、t individual value above the appropriate values given in Table 2, then two further test pieces shall be tested. The median of the five results shall be in accordance with the values given in Table 2. Table 2 Tensile strength and elongation at break of outsole 6.2 Tensile requirements after ageing Af
36、ter submission to the ageing treatment specified in clause 3 of BS 903-A19:1986, using a normal oven, the median values for tensile strength and elongation at break of outsoles determined in 6.1 shall not show changes from the unaged median values greater than the amount specified in Table 3. Table
37、3 Tensile strength and elongation at break after ageing of outsoles 7 Electrical requirements for conducting and antistatic footwear 7.1 Electrically conducting footwear The resistance of the overshoe or overboot when new shall not be greater than 1.5 1057 when determined in accordance with A.4.15 a
38、) of BS 2050:1978. Every article of footwear shall be tested. 7.2 Antistatic footwear 7.2.1 The resistance of the overshoe or overboot when new shall not be less than 75 k7 when determined in accordance with A.4.15 a) of BS 2050:1978. Every article of footwear shall be tested. 7.2.2 The resistance o
39、f the overshoe or overboot when new shall not be greater than 100 M7 when determined in accordance with A.4.15 b) of BS 2050:1978. Every article of footwear shall be tested. 8 Marking Footwear shall be indelibly and legibly marked with the following: a) the size, stamped on the inside; b) the manufa
40、cturers name or identification; c) the number of this British Standard, i.e. BS 7193:19891), stamped on the inside; d) for electrically conducting footwear, each article shall have a red back strip together with a permanent red label bearing the words “Electrically Conducting” bonded, or otherwise s
41、ecurely fixed, in a suitable position to the outside of the footwear. The words “Test regularly” shall appear on each article on or near the label; Minimum tensile strength Minimum elongation at break MPa% Outsole8.5250 Ageing treatmentMaximum change after ageing Tensile strength Elongation at break
42、 168 h at 70 1 C 20 % of unaged value 30 % + 10 % of unaged value 1) Marking BS 7193:1989 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the
43、 claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2
44、006, Uncontrolled Copy, (c) BSI BS 7193:1989 BSI 09-19993 e) for antistatic footwear, each article shall have a lemon yellow backstrip together with a permanent lemon yellow label bearing the word “Antistatic” bonded, or otherwise securely fixed, in a suitable position to the outside of the footwear
45、. The words “Test regularly” shall appear on each article on or near the label. 9 Labelling Electrically conducting and antistatic footwear shall have an informative label supplied with each pair of overshoes and overboots. This label shall state: “Flexing, contamination, damage and wear can cause c
46、hanges in electrical resistance. TEST REGULARLY.” NOTEDuring service the electrical resistance of overshoes and overboots made from conducting or antistatic material may change significantly due to flexing and contamination. It is therefore necessary to ensure that the product is capable of fulfilli
47、ng its desired function of dissipating electrostatic charges and also of giving any desired protection during the whole of its life. The user is therefore recommended to carry out the test for electrical resistance at regular and frequent intervals. If in doubt, the manufacturer should be consulted
48、for frequency of testing. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 4 BSI 09-1999 Figure 1 Component parts of the footwear Licensed Copy: London South Bank University, London South Bank Unive
49、rsity, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 BSI 09-19995 Figure 1 Component parts of the footwear (concluded) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7193:1989 6 BSI 09-1999 Appendix A Method of preparation and test for fabrics Cut strip test pieces of rectangular shape, 25 mm wide, from the upper part of the footwear to be tested and through the full thickness of the upper, i.e. including the rubbe
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