1、BRITISH STANDARD BS 4023:1975 Specification for Flexible cellular PVCsheeting UDC 678.743.22 405.8 41BS4023:1975 This British Standard, having been approved by the Plastics andRubber Industry Standards Committees, was published underthe authority of the Executive Board on 28February1975 BSI 08-1999
2、BS 4023-1 first published July1966 BS 4023-2 first published December 1967 First revision (combined) February1975 The following BSI references relate to the work on this standard: Committee reference PLC/RUC/8 Draft for comment 72/54954 DC ISBN 0 580 08571 6 Co-operating organizations The Plastics a
3、nd Rubber Industry Standards Committees, under whose supervision this British Standard was prepared, consist of representatives from the following Government departments and scientific and industrial organizations: British Association of Synthetic Rubber Manufacturers British Plastics Federation* Br
4、itish Resin Manufacturers Association British Rubber Manufacturers Association Ltd.* Chemical Industries Association Ltd* Department of the Environment, Building Research Establishment Department of Industry Electrical and Electronic Insulation Association Electrical Installation Equipment Manufactu
5、rers Association Electrical Research Association Engineering Equipment Users Association Malaysian Rubber Producers Research Association* Ministry of Defence* Plastics Institute Post Office Royal Institute of British Architects Royal Institute of Public Health and Hygiene Rubber and Plastics Researc
6、h Association of Great Britain* Rubber Growers Association Society of Motor Manufacturers and Traders Ltd* The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entruste
7、d with the preparation of this British Standard: Association of British Foam Laminators British Fire Services Association British Furniture Manufacturers Federated Associations British Railways Board Department of the Environment Furniture Industry Research Association Induction and Dielectric Heati
8、ng Manufacturers Association Leather and Coated Fabrics Manufacturing Association London Transport Executive National Bedding Federation Amendments issued since publication Amd. No. Date of issue CommentsBS4023:1975 BSI 08-1999 i Contents Page Co-operating organizations Inside front cover Foreword i
9、i 1 Scope 1 2 References 1 3 Type 1 sheeting (physically blown material) 1 4 Type 2 sheeting (chemically blown material) 2 Appendix A Sampling, conditioning and measurement 4 Appendix B Air oven ageing 4 Appendix C Low-temperature resistance 4 Appendix D Organic materials staining 5 Figure 1 Low-tem
10、perature flexing apparatus 6 Table 1 Hardness grades of type 1 sheeting 1 Table 2 Physical requirements for type 1 sheeting 1 Table 3 Hardness grades for type 2 sheeting 2 Table 4 Physical requirements for type 2 sheeting 3 Publications referred to Inside back coverBS4023:1975 ii BSI 08-1999 Forewor
11、d This British Standard has been prepared under the joint authority of the Plastics and Rubber Industry Standards Committees and is a revision and combination of BS4023-1:1966 and BS4023-2:1967 which covered physically and chemically blown materials separately. Flexible cellular PVC sheeting is avai
12、lable in two types as follows: Physically blown material. Produced by physical gassing and having a substantially open cell and porous structure. Chemically blown material. Usually produced on a backing by decomposition of the appropriate blowing agents and having a substantially closed cell structu
13、re. The two types of material show markedly different characteristics. Physically blown materials usually have a high air permeance whereas chimically blown materials are usually impermeable. The principle technical changes made in this revision are: a) The procedures described in BS4443 “Methods of
14、 test for flexible cellular materials”, Part2 “Method7 Indentation hardness tests” are now specified for the measurement of indentation hardness index. This method corresponds to International Standard2439 “Flexible cellular materials Hardness testing by indentation techniques”, prepared by Technica
15、l Committee ISO/TC45 of the International Organization for Standardization (ISO). For type1 sheeting, which, although used only in thicknesses of up to25mm, is manufactured in thicknesses greater than50mm, the material indentation hardness index is specified. For type2 material, which is normally on
16、ly available in thicknesses much less than50mm, it is necessary to use a test piece consisting of a number of plies, and the product indentation hardness index is therefore specified. b) A range of indentation hardness levels is provided for each type of sheeting. Attention is drawn to the commercia
17、l availability of sheeting complying with the requirements of this standard and claimed to have flame retardant characteristics. Specific requirements for this type of sheeting cannot be included in the standard because no generally accepted method of test for flammability is available. Efforts to d
18、evise such a method are being made at both national and international levels. Sheeting with flame retardant characteristics is normally coloured pink or printed with appropriate identification. Further requirements on fogging and sound absorbance, and improvements in the method for assessing low-tem
19、perature characteristics, are under consideration. Certification. Attention is drawn to the certification facilities described on the inside back cover of this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsi
20、ble 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, pagesi andii, pages1 to6, an inside back cover and a back cover. This standard has been upda
21、ted (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4023:1975 BSI 08-1999 1 1 Scope This British Standard specifies requirements for flexible cellular PVC in the form of sheets up to25mm in thickness for use in
22、applications involving welding (e.g. padding and quilting). Sheets may be welded together to form long lengths. Two types of sheeting are specified as follows: Type 1. Physically blown material Type 2. Chemically blown material. Hardness grades are specified for each type of sheeting. 2 References T
23、he titles of the British Standards referred to in this standard are listed on the inside back cover. 3 Type 1 sheeting (physically blown material) 3.1 Structure. The material shall consist substantially of a network of open cells but may have a small proportion of closed cells. The material shall be
24、 of substantially uniform structure and free from defects likely to affect serviceability. The material shall be free from surface skin. 3.2 Colour. The colour shall be as agreed between the purchaser and the supplier. 3.3 Dimensions. The dimensions shall be as agreed between the purchaser and the s
25、upplier subject to the following tolerances: Dimensions shall be determined in accordance with BS4443-1, method1, after preparation as described inAppendix A. 3.4 Hardness. Sheeting shall be supplied in the grades of hardness as specified inTable 1 when tested by the method described in BS4443-2, me
26、thod7. Table 1 Hardness grades of type 1 sheeting 3.5 Physical properties. The material shall comply with the requirements specified inTable 2. All tests shall be carried out on material sampled and conditions as described in Appendix A. Table 2 Physical requirements for type 1 sheeting Length and w
27、idth 0, +2% of the specified nominal values Thickness 0, +0.6 mm or 10% of the specified nominal value, whichever is the greater. Grade 1 2 Material indentation hardness index 150 40 N 230 40 N Property Requirement or limit Method of test Air oven ageing: change in material indentation hardness inde
28、x,max. 20 % Appendix B and BS 4443-2 Compression set, max. 20% BS 4443-1, method 6, procedure B test piece12mm thick using 50% compression Density Agreed value 15% BS 4443-1, method 2 Tensile strength, min. 100 kPa BS 4443-1, method 3 Elongation at break, min. 80% BS 4443-1, method 3 Low-temperature
29、 resistance No cracks Appendix C Organic materials stainingtest Shall not stain Appendix DBS4023:1975 2 BSI 08-1999 3.6 Marking. Each roll or lot of type1 sheeting shall have attached to it, or to its immediate packing, a label bearing the following information, unless otherwise agreed between the s
30、upplier and the purchaser: a) the name and/or distinctive mark of the manufacturer; b) the batch number or other reference to identify the material with a manufacturing batch; c) the nominal thickness; d) the nominal width; e) the nominal length; f) the number of this British Standard with the type
31、and grade of sheeting as suffix, e.g.BS4023-11. 4 Type 2 sheeting (chemically blown material) 4.1 Structure. The material, usually produced on a backing or a carrier, shall consist substantially of a network of closed cells but may have a small proportion of open cells. The material shall be of subs
32、tantially uniform structure and free from defects likely to affect serviceability. Any surface skin shall not adversely affect the performance characteristics. 4.2 Colour. The colour shall be as agreed between the purchaser and the supplier. 4.3 Dimensions. The dimensions shall be as agreed between
33、the purchaser and the supplier subject to the following tolerances: Dimensions shall be determined in accordance with BS4443-1, method1, after preparation as described inAppendix A. 4.4 Hardness. Sheeting shall be supplied in the grades of hardness as specified inTable 3 when tested bythe method des
34、cribed in BS4443-2, method7, except that preloading shall be to50 2.5% of the thickness. Table 3 Hardness grades of type 2 sheeting 4.5 Physical properties. The material shall comply with the requirements specified inTable 4. All tests shall be carried out on material sampled and conditioned as desc
35、ribed inAppendix A. Length and width 0, +2% of the specified nominal values Thickness 0, +0.6mm or 10% of the specified nominal value, whichever is the greater. Grade 3 4 5 Product indentation hardness index 280 30 N 340 30 N 400 30 NBS4023:1975 BSI 08-1999 3 Table 4 Physical requirements for type 2
36、 sheeting 4.6 Marking. Each roll or lot of type2 sheeting shall have attached to it, or to its immediate packing, a label bearing the following information, unless otherwise agreed between the supplier and the purchaser: a) the name and/or distinctive mark of the manufacturer; b) the batch number or
37、 other reference to identify the material with a manufacturing batch; c) the nominal thickness; d) the nominal width; e) the nominal length; f) the number of this British Standard with the type and grade of sheeting as suffix, e.g. BS4023-23. Property Requirement or limit Method of test Air oven age
38、ing: change in product indentationhardness index,max. 25% Appendix B and BS4443-2 Compression set, max 25 % BS4443-1, method6, procedure B test piece12mm thick using50% compression Density Agreed value 15 % BS 4443-1, method 2 Tensile strength, min. 150 kPa BS 4443-1, method 3 Elongation at break, m
39、in. 80 % BS 4443-1, method 3 Low-temperature resistance No cracks Appendix C Organic materials stainingtest Shall not stain Appendix DBS4023:1975 4 BSI 08-1999 Appendix A Sampling, conditioning and measurement A.1 Sampling Take representative samples of the flexible cellular PVC sheeting, selected a
40、t random, thenumber and size of the samples being agreed between the purchaser and the supplier. A.2 Sample preparation Remove any backing as carefully as possible to avoid damage to the cellular material. The use of tetrahydrofuran, butanone (MEK) or acetone as a stripping aid is permissible. If th
41、ese solvents are used, minimal quantities shall be employed and the conditioning period (seeA.3) shall be extended to24h. A.3 Conditioning Samples shall not be tested less that16h after manufacture; they shall be conditioned immediately before testing for a period of not less than6h at a temperature
42、 of23 2 C and a relative humidity of505%. A.4 Test temperature Unless otherwise specified, tests shall be carried out at a temperature of23 2 C. A.5 Measurement Measure the test pieces in accordance with method1 of BS4443-1. Appendix B Air oven ageing B.1 General This test measures the change in ind
43、entation hardness produced on ageing in a ventilated oven. B.2 Apparatus A ventilated oven with forced air circulation, of sufficient size to allow free circulation of air with the test piece inposition, and capable of maintaining the test piece at a temperature of100 1 C, is required. B.3 Procedure
44、 Determine the appropriate (material or product) indentation hardness index of the test piece as described in BS4443-2. Place the test piece in the air oven at a temperature of100 1 C for22h to24h. At the end of this period remove the test piece and allow it to stand for22h to24h at room temperature
45、. Remeasure the appropriate indentation hardness index as described in BS4443-2 and calculate the change in value as a result of ageing from the following formula: where NOTEIn cases of dispute, test pieces of different composition should be aged individually. Appendix C Low-temperature resistance C
46、.1 Apparatus The following apparatus is required. a) A flexing apparatus as shown inFigure 1. b) A cold box capable of being maintained at a temperature of5 1 C and large enough to permit the bending of the test piece while it is still in the box. The door should be at the top. C.2 Test piece The te
47、st piece shall consist of a strip about50mm wide and120mm long, having a thickness of3 0.25mm, made from sheeting of the same composition as the sheeting under test. C is percentage change in indentation hardness index, L o is original indentation hardness index, and L f is indentation hardness inde
48、x after ageing. C L o L f L o -100 =BS4023:1975 BSI 08-1999 5 C.3 Procedure Place the test piece under the mandrel and clamp of the flexing device, one end being left free. Suspend the apparatus in the cold box at a temperature of 5 1 C for a period of2h to3h. At the end of this period open the cold
49、 box and close the flexing apparatus as quickly as possible so that the test piece is bent through180 . Report any cracks in the test piece. Appendix D Organic materials staining D.1 General This test is intended to provide information as to whether the material will cause discoloration of plastics materials (or organic finishes) with which it will be in contact. D.2 Test and reference panels The test and reference panels shall consist of suitably dimensioned pieces of a
