1、BRITISH STANDARD BS 3878:1982 Incorporating Amendment No. 1 Specification for Flexible PVC sheeting for hospital use UDC 678.743.22-415:615.47BS3878:1982 This British Standard, having been prepared under the directionof the Plastics StandardsCommittee, was published under the authority of the Execut
2、ive Board and comes into effect on 26February1982 BSI 10-1999 First published March 1965 First revision February 1982 The following BSI references relate to the work on this standard: Committee reference PLC/40 Draft for comment 78/55578 DC ISBN 0 580 12175 5 Cooperating organizations The Plastics S
3、tandards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: British Plastics Federation* British Resin Manufacturers Association Chemical Industries Association Department of Industry (Chemicals and Textiles) Department of the Environ
4、ment (Building Research Establishment) Department of the Environment (PSA) Department of Trade (Metrology, Quality Assurance, Safety and Standards Division) Electrical and Electronic and Insulation Association (BEAMA) Electrical Installation Equipment Manufacturers Association (BEAMA) Engineering Eq
5、uipment Users Association ERA Technology Ltd.* Institution of Production Engineers Ministry of Defence* Plastics and Rubber Institute Post Office Royal Institute of British Architects Rubber and Plastics Research Association of Great Britain Society of Chemical Industry Society of Motor Manufacturer
6、s and Traders Limited The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: British Gas Corporation British Steel Industry Department of Health and Social
7、 Security Ductile Iron Producers Association Furniture Industry Research Association Institution of Gas Engineers Packaging and Industrial Films Association Pira (The Research Association for the Paper and Board, Printing and Packaging Industries) Individual firm Amendments issued since publication
8、Amd. No. Date of issue Comments 6283 November1990 Indicated by a sideline in the marginBS3878:1982 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Classification 1 5 Composition 1 6 Sampling 2 7 Dimensional stability 2 8
9、 Tensile strength and elongation at break 2 9 Anti-static requirement 2 10 Tear strength 2 11 Low temperature extensibility 2 12 Resistance to extraction by an oily medium 2 13 Resistance to extraction by a soap solution 2 14 Adhesion of print 2 15 Thickness 2 16 Blocking 3 17 Colour bleeding 3 18 C
10、olour fastness and light stability 3 19 Ply adhesion of laminated sheeting 3 20 Retention of embossed surface 3 21 Sulphur stain resistance 3 22 Visual examination 3 23 Requirements and testing for physical properties 4 24 Marking 4 Appendix A Recommended scheme for the selection of test pieces 7 Ap
11、pendix B Method for determining dimensional stability 7 Appendix C Method for determining retention of embossed surface 8 Appendix D Method for determining surface resistance 9 Appendix E Method for determining resistance to extraction by anoilymedium 9 Appendix F Method for determining resistance t
12、o extraction by soap solution 9 Appendix G Method for determining sulphur stain resistance 10 Appendix H Limiting values for statistical control 10 Appendix J Informative labelling 11 Figure 1 Selection of test pieces 8 Table 1 Limiting values for physical properties requiring frequentdetermination
13、4 Table 2 Limiting values for physical properties requiring occasionaldetermination 5 Table 3 Requirements and determination frequencies for physicalpropertieswithout limiting values 5 Table 4 Maximum and minimum permissible values of averagegravimetricthickness within a roll 6 Table 5 Maximum and m
14、inimum permissible values of gravimetricthicknessof sample 6 Publications referred to Inside back coverBS3878:1982 ii BSI 10-1999 Foreword This British Standard, first published in1965, has been revised under the direction of the Plastics Standards Committee and is one of a series for flexible polyv
15、inyl chloride materials. The1965edition is withdrawn. The standard is based on technical data provided by the British Plastics Federation. Other standards in the series are as follows. BS 1763, Thin PVC sheeting (calendered, flexible, unsupported). BS 2739, Thick PVC sheeting (calendered, flexible,
16、unsupported). In this revision, only metric units have been used. Performance requirements for tensile strength, elongation at break, dimensional stability, tear strength, and low temperature extensibility have been changed to bring the limits into line with those in BS1763. Consideration has been g
17、iven to providing a means of assessing the readiness with which sheeting can be welded, but attempts to produce a laboratory test to measure this property have failed owing to the wide variation in electrode systems, machines and techniques in common usage. The object of this standard is to cater fo
18、r flexible, unsupported PVC sheeting suitable for hospital uses such as draw sheets, mattress covers, waterproof sheeting, aprons, pillow covers, protective clothing, curtains, screen covers, trolley covers, surgeons stool tops, drapes and for certain packaging purposes. Material complying with the
19、requirements of BS1763and BS2739is likely to be suitable for a number of these applications and should be specified where resistance to soap and oil extraction is not required. Four types of sheeting are specified in this standard. Types1and2, having anti-static properties, are suitable for use in a
20、naesthetizing areas while types3and4are for general purpose use. Due consideration was given to the specification of limits for surface resistance for types3and4since this is desirable to reduce dust and bacterial attraction. At the present stage of development, sheeting manufactured with low surfac
21、e resistance would be seriously affected in respect of other characteristics, e.g.translucency, and the capability for fabrication and colour printing. An amendment to this standard will be considered when it proves possible to produce “general purpose” material having this additional desired proper
22、ty. The principle of statistical control (see Appendix H) of certain properties has been retained in this revision as it has been shown by experience that the variability of results, both within the material itself and from certain test methods, is such that very low quality single level limits (see
23、 H.1.1) would need to be specified to avoid rejection of satisfactory material. By application of the statistical control principle, it is intended to bring about a general improvement in the quality of material complying with the requirements of this standard. A British Standard does not purport to
24、 include all the necessary provisions 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,
25、pages i and ii, pages1 to 12, 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.BS3878:1982 BSI 10-1999 1 1 Scope This British Standard specifies
26、 requirements for flexible unsupported PVC sheeting intended for use in hospitals, of nominal thickness up to and including900 4m, and classified in accordance with clause 4. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Definitions F
27、or the purposes of this standard, the following definitions apply. 3.1 nominal thickness the thickness of sheeting in micrometres as stated by the supplier 3.2 gravimetric thickness the value of thickness derived from the mass of a known area of sheeting and its relative density as determined by BS2
28、782:Method631A, except that it is normally expressed in micrometres. 3.3 limiting values, L and in relation to statistical control, L is the specified lower quality limit for single samples andis the specified average quality limit (see Appendix H) 3.4 micrometer thickness the value of thickness obt
29、ained by direct measurement using a micrometer gauge in accordance with BS2782:Method 630A, except that it is normally expressed in micrometres. This method is not suitable for embossed sheeting 3.5 printed sheeting sheeting to which a continuous or discontinuous transparent or coloured surface coat
30、ing has been applied and including all multitone effects and lacquered surfaces 3.6 embossed sheeting printed or unprinted sheeting having a raised or indented pattern NOTE 1This is also known as textured sheeting. NOTE 2Plain frosted (matt) or polished PVC sheeting produced by an operation subseque
31、nt to the calendering process is, by convention, included in this definition. 3.7 anti-static sheeting sheeting complying with the requirements for surface resistance in Table 1 3.8 laminated sheeting superimposed plies (layers) of sheeting bonded together by any suitable process 3.9 roll of sheetin
32、g sheeting in roll form, in length not less than10m as supplied by the manufacturer 3.10 sample of sheeting a sample taken in accordance with clause 6 3.11 sequence of samples all samples of sheeting tested by the manufacturer or the purchaser, and having been manufactured to comply with the require
33、ments of this standard, during a period not exceeding six months 4 Classification Sheeting shall be classified according to one of the following types. NOTEOdd type numbers apply to unprinted sheeting and even type numbers to printed sheeting in this standard and in BS1763and BS2739. 5 Composition S
34、heeting shall be manufactured from a polymer of vinyl chloride and/or a copolymer, the major constituent of which shall be vinyl chloride. Such material shall be suitably compounded and converted to sheeting of nominal thickness up to and including9004m. X X Type1. Anti-static unprinted single ply o
35、r laminated sheeting with plain or embossed surface. Type2. Anti-static printed single ply or laminated sheeting with plain or embossed surface. Type3. Unprinted single ply or laminated ply sheeting with plain or embossed surface. Type4. Printed single or laminated ply sheeting with plain or embosse
36、d surface.BS3878:1982 2 BSI 10-1999 6 Sampling A representative sample which is the full width of the sheeting, and is not less than1m 2in area and not less than1m in length, shall be taken. The longitudinal direction of the sheeting shall be marked on the sample. The information given on the label
37、(see 24.1) shall be supplied with the sample. NOTETo avoid difficulties in subsequent testing, the sample should be rolled on a tube of adequate diameter. The sample shall thereafter be kept out of contact with other plastics materials. When sheeting in roll form is being sampled, the sample shall b
38、e taken from a position in which no part of it is less than three layers from the ends of the roll. For visual examination only, either a sample at least3m in length by the full width of the sheeting, or an equivalent uncut length of the roll, shall be examined by the method described in clause 22.
39、NOTEThe preferred manner of selecting test pieces from the sample is given in Appendix A. 7 Dimensional stability When tested in accordance with Appendix B, the maximum change in dimensions of laminated or unlaminated sheeting shall not exceed the values given in Table 1. 8 Tensile strength and elon
40、gation at break When tested in accordance with method301E 1)of BS2782:1970, the longitudinal and transverse tensile strength and elongation at break shall be not less than the limiting values given in Table 1. 9 Anti-static requirement Sheeting types1and2shall comply with the surface resistance requ
41、irements shown in Table 1 when tested in accordance with Appendix D. In addition, material made anti-static by a conductive print on its surfaces shall not have an electrically insulating area on either surface greater than35mm 2 determined by visual inspection. 10 Tear strength When tested in accor
42、dance with method308B of BS2782:1970, the tear strength of sheeting shall be not less than the limiting values given in Table 1. NOTEIn the higher thicknesses of the range covered by this standard, the apparatus described in method308B of BS2782:1970may not be capable of tearing the sheeting, even w
43、ith the augmenting weight fitted and using the half-size test piece. In this case, the average tear strength may be reported as follows: 11 Low temperature extensibility When tested in accordance with method104C of BS2782:1970using test specimens cut so that their lengths are in the transverse direc
44、tion of the sheeting, the limiting values for extension of the sheeting at 5 C shall be as given in Table 2. 12 Resistance to extraction by an oily medium When tested in accordance with Appendix E, sheeting of thickness1004m and greater shall show a loss of mass on extraction by an oily medium of no
45、t greater than the limiting values given in Table 2. 13 Resistance to extraction by a soap solution When tested in accordance with Appendix F, sheeting of thickness1004m and greater shall show a loss of mass on extraction by a soap solution of not greater than the limiting values given in Table 2. 1
46、4 Adhesion of print When tested in accordance with method310B of BS2782:1970, visible damage shall not be produced on embossed or unembossed sheeting by fewer than the number of cycles given in Table 3. 15 Thickness 15.1 Average gravimetric thickness within a roll. Sheeting shall be tested in accord
47、ance with BS2782:Method632A. The average gravimetric thickness of the sheeting within a roll shall be within the limits shown for the appropriate nominal thickness in Table 4. NOTEWhen agreed between purchaser and supplier, the average gravimetric thickness of the roll may be expressed in millimetre
48、s. 1) A revised method is in course of preparation. It should be noted that method301E has been incorrectly and inadvertently recorded as withdrawn elsewhere. “greater than50N”, or “greater than N/mm” where t is the gravimetric thickness of the sample in micrometres. 50 000 t -BS3878:1982 BSI 10-199
49、9 3 15.2 Gravimetric thickness of the sample (seeTable 3). Five test pieces shall be cut from positions approximately equally spaced across the width of the sample, at each of two places approximately1m apart in the longitudinal direction. Using these test pieces the gravimetric thickness of all samples, when tested in accordance with BS2782:Method 631A, shall be within the limits shown for the appropriate nominal thickness in Table 5. The arithmetic mean of the ten determinations shall be used in any test method where the average gravimetric thi
