1、BRITISH STANDARD BS5131-2.11: 1983 Methods of test for Footwear and footwear materials Part2: Solings Section2.11 Resistance of solings to short-term contact with a hot surface NOTEIt is recommended that this Section should be read in conjunction with the information in the General introduction toBS
2、5131, published separately. UDC685.31:620.1:539.434:685.312.12BS5131-2.11:1983 This British Standard, having been prepared under the directionof the Clothing Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31 March1983 BSI 10-1999 The following BSI r
3、eferences relate to the work on this standard: Committee reference CLM/7 Draft for comment80/35240 DC ISBN0 580 13259 5 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with
4、 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 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. T
5、his will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS5131-2.11:1983 BSI 10-1999 i Contents Page 1 Scope 1 2 References 1 3 Principle 1 4 Apparatus 1 5 Preparation and conditioning of test pieces 1 6 Procedure 2 7
6、 Assessment of heat damage 2 8 Test report 2 Figure 1 General arrangement of the apparatus 3 Figure 2 Details of the bit and heating block 4ii blankBS5131-2.11:1983 BSI 10-1999 1 1 Scope This Section describes a method for the visual assessment of the effects on soling materials of short-term contac
7、t with a hot surface. This method enables the assessment of the suitability of soling materials for footwear which is used in situations where brief contact with hot objects is likely. This test should not be used for assessing the effects of long-term exposure at elevated temperatures. 2 References
8、 This Section refers to the following publications: BS1006, Methods of test for colour fastness of textiles and leather. BS5131, Methods of test for footwear and footwear materials. BS5131-2.7, The preparation of test pieces from soling materials for physical testing. 3 Principle A pre-heated metal
9、block is placed on to the soling material, under constant pressure, for a short fixed period of time and the appearance of the heated part of the surface is examined before and after bending around a mandrel. Depending on the purpose of the test, it may be carried out either: a) at one specified tem
10、perature; or b) over a range of increasing temperatures until visible degradation has occurred. If the tests are carried out according to b) it is usually possible to identify a temperature above which significant surface damage of the test piece occurs. 4 Apparatus 4.1 A cylindrical copper body, re
11、ferred to as the bit, of mass200 20g and with the lower end reduced to a flat square face with sides of dimension25.5 1mm. The bit has a central longitudinal cavity of6.5mm diameter, extending to4mm from the outer working surface of the square end of the bit, to receive a temperature measuring devic
12、e. The other dimensions of the bit are shown inFigure 2. 4.2 A metal heating block, of mass530 50g, which surrounds the cylindrical part of the bit. This heating block contains an electrical resistance heating element and a means of control (an “on/off” switch is sufficient) to pre-heat the bit to a
13、ny desired temperature up to a maximum of400 C. The dimensions of the heating block are shown in Figure 2. 4.3 A device for measuring the internal temperature of the bit close to its square end. A convenient way of measuring the temperature is a mercury-in-glass thermometer reading to400 C. NOTEFor
14、such a thermometer it is recommended that the small space between the thermometer bulb and the wall of the cavity be filled with a metal alloy having a melting point below150 C. 4.4 A means of raising and lowering the bit, together with the heating block, to bring its face into uniform contact with
15、the test piece, in a horizontal plane and under a uniformly distributed pressure of202kPa. 4.5 A self-aligning platform, of suitable diameter, to receive the test piece and maintain uniform pressure on the test piece. 4.6 A hinged support with thermally insulated face on which the face of the bit re
16、sts during heating, and which can be moved aside to enable the bit to be lowered on to the test piece. 4.7 A mandrel of101mm diameter. WARNING. As toxic fumes may be released from some solings during this test it is necessary to site the apparatus in a well ventilated area. NOTEThe test apparatus sh
17、own inFigure 1 is a slightly modified form of that specified inBS1006-UK-LA. It is obtainable from the SATRA Footwear Technology Centre, SATRA House, Rockingham Road, Kettering, Northants, NN169JH. 5 Preparation and conditioning of test pieces Prepare a test sheet having a thickness in the range3.0
18、to7.0mm and cut from it test pieces30 2mm wide by70mm (minimum) long as described inBS5131-2.7. Allow the time interval specified inBS5131-2.7 to elapse between test sheet preparation and test piece cutting. For leather specimens condition test pieces for48h at20 C and65% relative humidity before te
19、sting.BS5131-2.11:1983 2 BSI 10-1999 6 Procedure Switch on the heating block with the bit resting on the insulating support, and place the test piece on the platform below with its wearing side uppermost. Cover the test piece with aluminium foil to prevent contamination of the heated bit. Use a new
20、piece of foil for each test. When the selected or specified bit temperature is just exceeded switch off the heating block and allow the temperature to fall to within 2 C of the required value, with the bit still resting on its insulating support. Then move the insulating support aside and immediatel
21、y place the bit centrally on to the test piece, so that its sides are parallel to the sides of the test piece. Leave it in position for60 1s without switching the heating block on again and then replace it on the support. Remove the foil, allow the test piece to cool for at least10min and examine th
22、e heated part of its surface as described inclause7. Where appropriate repeat the test at higher or lower temperatures, as necessary, on fresh test pieces in steps of approximately20 C. 7 Assessment of heat damage Assess the surface of the test piece visually for damage such as melting, charring, cr
23、acking or crazing, both before and after bending it round the mandrel. Record the type and severity of the damage. NOTEMaterials such as polyvinyl chloride, expanded polyurethane and thermoplastic rubbers will soften or melt as the temperature of the bit is increased. In the case of materials such a
24、s vulcanized rubber and leather solings, the damage usually takes the form of charring of the surface, often followed by cracking when the test piece is bent round the mandrel. For leather soles record whether charring or cracking is confined to the grain layer or whether any penetrates into the cor
25、ium. 8 Test report 8.1 If the purpose of the test is to find out whether the soling material passes or fails a specification which includes one fixed test temperature, the test report shall include the following: a) the test material reference; b) the reference of the test, i.e.BS5131-2.11; c) the s
26、pecified temperature of the test; d) the effects on the test piece such as 1) no visible change, 2) slight softening/melting/surface cracking, etc., 3) severe softening/melting/surface cracking, etc. e) passes/fails the specification due to the effects described in d). 8.2 If the purpose of the test
27、 is to establish the temperature above which significant surface damage occurs, the test report shall include the following: a) the test material reference; b) the reference of the test, i.e.BS5131-2.11; c) a description of the visible effects of the test at three or four temperatures, separated by2
28、0 C, bridging the temperature at which distinct degradation was judged to have occurred; d) the highest test temperature at which surface damage was found to be negligible.BS5131-2.11:1983 BSI 10-1999 3 Figure 1 General arrangement of the apparatusBS5131-2.11:1983 4 BSI 10-1999 Figure 2 Details of t
29、he bit and heating block5 blankBS5131-2.11: 1983 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated
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