1、BRITISH STANDARD BS1254:1981 Specification for WC seats (plastics) UDC 696.141.1:684.43:678.5BS1254:1981 This British Standard, having been prepared under the directionof the Building ServicesStandards Committee,was published underthe authority of the Executive Board and comes intoeffect on 30 April
2、1981 BSI08-1999 First published October1945 First revision May1971 Second revision April1981 The following BSI references relate to the work on this standard: Committee referenceSEB/1 Draft for comment78/14091 DC ISBN 0 580 11786 3 Cooperating organizations The Building Services Standards Committee,
3、 under whose direction this British Standard was prepared, consists of representatives from the following: Association of District Councils Domestic Solid Fuel Appliances Approval Bath Manufacturers Coordinating Committee Scheme British Gas Corporation Environmental Health Officers Association* Brit
4、ish Ironfounders Association* Greater London Council* British Plastics Federation* Heating and Ventilating Contractors British Plumbing Employers Council Association British Precast Concrete Federation Ltd. Incorporated Association of Architects and Builders Merchants Federation* Surveyors Building
5、Services Research and Information Institute of Plumbing* Association Institution of Gas Engineers Chartered Institution of Building Services Institution of Municipal Engineers Clay Pipe Development Association Limited* Institution of Public Health Engineers* Consumer Standards Advisory Committee of
6、Institution of Structural Engineers BSI* Institution of Water Engineers and Scientists* Convention of Scottish Local Authorities National Brassfoundry Association* Council of British Ceramic Sanitaryware National Coal Board Manufacturers* National Federation of Building Trades Department of Health a
7、nd Social Security* Employers Department of the Environment (Building National Water Council* Research Establishment)* Royal Institute of British Architects* Department of the Environment (Housing and Royal Institution of Chartered SurveyorsConstruction)* Royal Society of Health Department of the En
8、vironment (PSA)* Scottish Development Department Department of the Environment (Water Trades Union CongressEngineering Division including Water Water Companies AssociationData Unit) The organizations marked with an asterisk in the above list, together with the following, were directly represented on
9、 the Technical Committee entrusted with the preparation of this British Standard: British Bath Manufacturers Association National Association of Plumbing, Heating and British Woodworking Federation Mechanical Services Contractors Design Council Plastic Bath Manufacturers Association Metal Sink Manuf
10、acturers Association South London Consortium Modular Society Limited Individual expert Amendments issued since publication Amd. No. Date of issue CommentsBS1254:1981 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii Section 1. General 1 Scope 1 2 References 1 3 Def
11、inition 1 4 Types 1 5 Designation of seats for ordering purposes 1 6 Informative labelling 1 7 Marking 1 Section 2. Materials, design and construction 8 General requirements for type1 and type2 seats and covers 1 9 Specific requirements for type1 seats and covers 2 10 Special requirements for type2
12、seats 2 11 Special requirements for type2 covers 3 12 Buffers for type1 and type2 seats and covers 4 13 Hingeing devices for type1 and type2 seats and covers 5 Appendix A Information to be provided by the purchaser 8 Appendix B Method of determining the water absorption oftype2seatsandcovers 8 Appen
13、dix C Method of determining the impact resistance of type2 seats 8 Appendix D Method of determining the impact resistance of type2 covers 9 Appendix E Method of determining the rigidity of type2 seats 9 Appendix F Method of determining the rigidity of type2 covers 10 Appendix G Method of determining
14、 the distortion of type2 seats and covers 11 Appendix H Method of determining staining by type2 seats and covers 11 Appendix J Method of determining the staining of type2 seats and covers 12 Appendix K Method of testing the shape of type2 seats for hygienic design 12 Appendix L Method of determining
15、 the surface hardnessoftype2seatsandcovers 12 Figure 1 Diagrammatic sketch of seat 3 Figure 2 Apparatus for measuring impact resistance of type2 seats 9 Figure 3 Apparatus for measuring impact resistance of type2 covers 10 Figure 4 Apparatus for measuring rigidity of seats 10 Figure 5 Apparatus for
16、measuring rigidity of covers 11 Figure 6 Diagram of template 13 Table 1 Dimensions of WC seats 2 Table 2 Test requirements for type2 seats 4 Table 3 Test requirements for type2 covers 5 Publications referred to Inside back coverBS1254:1981 ii BSI 08-1999 Foreword This metric revision of BS1254 has b
17、een undertaken under the direction of the Building Services Standards Committee, and takes account of the requirements of BS5503 and BS5504. This standard still specifies the requirements for type1 and type2 seats and covers as in the1971 edition. Type1 seats and covers are manufactured from precise
18、ly named materials. Type2 seats and covers may be manufactured from any suitable plastics materials but have to comply with the requirements of a series of tests specified in this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
19、andards 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, pagesi and ii, pages1 to14, an inside back cover and a back cover. This
20、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.BS1254:1981 BSI 08-1999 1 Section 1. General 1 Scope This British Standard specifies requirements for plastics WC seats and covers (with or
21、 without metal components) of two types, both types being suitable for use with WC pans complying with the requirements of BS5503 and BS5504. Information to be provided by the purchaser is given in Appendix A. 2 References The titles of publications referred to in this standard are listed on the ins
22、ide back cover. 3 Definition For the purposes of this standard the following definition applies. 3.1 blooming the appearance caused by the movement of any additive to the surface of the product after the product is made 4 Types The WC seats and covers shall be of one or other of the following types.
23、 Type1. Seats and covers made from specified phenolic or aminoplastic moulding materials. Type2. Seats and covers made from any suitable plastics material which enables them to comply with the requirements of Appendix B to Appendix L. 5 Designation of seats for ordering purposes For ordering purpose
24、s, a plastics WC seat shall be designated as “a BS1254 seat type1” or “a BS1254 seat type2”. If the seat is to be supplied with a cover attached, the assembly shall be designated as “a BS1254 seat and cover type1” or “a BS1254 seat and cover type2”. 6 Informative labelling Informative labelling shal
25、l be provided for each type2 seat assembly and may be provided for type1 seat assemblies. Where informative labelling is required, each WC seat assembly shall be supplied with a self-adhesive label which shall commence with the following notice prominently displayed: “NOTICE TO BUILDER: PLEASE LEAVE
26、 THIS LABEL IN POSITION FOR THE USER TO READ”. The label shall also contain the following information: a) which cleansers may be used on the seat and cover; b) which polishes may be used on the seat and cover; c) the manner in which the cleansers and polishes should be used. The label shall also sta
27、te the following. “Avoid abrasives and scouring powder for cleaning and, in particular, avoid cleansers used to clean the WC pan”; “Lighted cigarettes should not be placed on the seat or cover”. 7 Marking Each seat, or each seat and cover, shall be clearly and indelibly marked with the following inf
28、ormation: a) the manufacturers name or identification mark; b) the number of this British Standard, and the type, i.e.“BS1254 type1” or “BS1254 type2” 1) . Section 2. Materials, design and construction 8 General requirements for type1 and type2 seats and covers 8.1 Construction. The surface of seats
29、, covers and components shall be smooth, free from blisters and delamination, and reasonably free from flow-lines, contamination, streaking and unintended colour variation. Mouldings shall be free from internal voids. 1) Marking BS1254 type1 or BS1254 type2 on or in relation to a product is a claim
30、by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed
31、to the Director, British Standards Institution, Maylands Avenue, Hemel Hempstead, Herts HP24SQ in the case of certification marks administered by BSI or to the appropriate authority for other certification, marks.BS1254:1981 2 BSI 08-1999 Materials that require curing shall be thoroughly cured. 8.2
32、Dimensions 8.2.1 Seat dimensions. All type1 and type2 seats shall conform to the dimensions given in Table 1 and Figure 1. Type1 and type2 seats may be of open front design, provided that the seat, together with any reasonable extension of its outline in a plan view necessary to produce the outline
33、plan shown in Figure 1, conforms to the dimensions given in Table 1. If the seat is of open front design, the width of the open front shall be a minimum of80mm and a maximum of140mm. 8.2.2 Cover dimensions. The dimensions of a type1 or type2 cover shall enable it to be connected to the seat by a hin
34、geing device complying with the requirements of clause13. The cover shall be of such a design and relationship with the seat that the inside of the bowl cannot be seen when the seat/cover assembly is viewed at45 to the horizontal. Table 1 Dimensions of WC seats 9 Specific requirements for type1 seat
35、s and covers 9.1 Materials. Type1 seats and covers shall be made from one of the following: a) phenol plastics complying with the requirements of BS771-1 orBS771-2; b) aminoplastics complying with the requirements of BS1322. 9.2 Design and construction. The underside of the seat shall be flat and sh
36、all not be recessed. The minimum thickness of the seat at its thickest point shall be19mm. The minimum thickness of the seat at its thinnest point (excluding rounded edges) shall be4.7mm. The minimum thickness of the cover shall be6mm to within25mm of the edge. There shall be no sharp edges. 10 Spec
37、ial requirements for type2 seats 10.1 Materials. Plastics materials used in the manufacture of type2 seats shall be such that under the conditions of use, the seats shall be: a) non-blooming; b) capable of passing the tests specified in10.4. 10.2 Dimensions. Any seat dimensions not specified in8.2.1
38、 shall be such that the seats shall be capable of meeting the test requirements specified in10.4. 10.3 Design and construction 10.3.1 Preferred design. The preferred design of any seat shall be such that the underside is flat. There shall be no sharp edges. 10.3.2 Other permitted designs. The unders
39、ide of the seat shall have as few recesses as possible. The only protuberances from the general contour of the hollowed part of the seat shall be for one or more of the following reasons: a) to provide, or reinforce, part of the hingeing device; b) to provide a buffer; c) to provide a distance piece
40、 to elevate the seat from the pan rim; d) for marking purposes. Any seat having a hollow underside shall not have protuberances for more purposes than are set out in one or other of the following groups. 1) Group1. For hingeing devices, buffers and marking. 2) Group2. For hingeing devices, distance
41、pieces and marking. Reference letter in Figure 1 Description Dimension mm A B C D E F G Distance from centre line of hinge bolts to extreme edge of rim at front Length of opening at longest point Width of opening at widest point Width overall at widest point Distance between inner and outer rims Min
42、imum adjustment of centres of hinge bolts Distance from centre line of hinge bolts to inner rim of seat at the back 432min. 463max. 255min. 285max. 215min. 240max. 380min. 57min. 145 to175 85min. 95max.BS1254:1981 BSI 08-1999 3 10.3.3 Hygienic shape requirement. Every recess on the underside of the
43、seat shall be: a) not less than5000mm 2in area measured on the surface of the underside of the seat; b) of such shape that: 1) a template as shown in Figure 6 can be inserted into the recess to the extent that the face plate is in the same plane as the underside of the seat; 2) every part of the rec
44、ess can be covered by the face plate when the template is within the recess; 3) at no point is the recess more than12mm deep from the plane of the underside of the seat, and the sides thereof shall in no circumstances be undercut; 4) every point thereon shall be capable of making contact with a sphe
45、rical ball20mm in diameter. If the seat has turned-down side flanges, no part of the flanges shall approach nearer than3mm to the vertical surface of the pan rim when the seat is resting on its buffers or distance pieces on the pan rim. 10.3.4 Distance pieces 10.3.4.1 General. If a seat is not fitte
46、d with buffers as specified in12.2, it shall have four radial ribs (known as distance pieces) moulded integrally with the seat to raise the seat not less than3mm from the upper surface of the rim of the WC pan. 10.3.4.2 Dimensions. The rib shall not be less than45mm in the radial direction, by not l
47、ess than3mm wide on plan. The distance between any two adjacent ribs shall not be less than100mm. 10.4 Test requirements. When tested in accordance with the methods listed in column5 of Table 2, type2 seats shall have the appropriate values given in columns3 and4 of Table 2 for the characteristics s
48、pecified therein. 11 Special requirements for type2 covers 11.1 Materials. Plastics materials used in the manufacture of type2 covers shall be such that, under the conditions of use, the covers shall be: a) non-blooming; b) capable of passing the tests specified in11.3. 11.2 Design and construction.
49、 The cover shall be so designed that it is capable of being raised easily from the seat. The underside of the cover shall not have any projections other than the outer rim or buffers. There shall be no sharp edges. 11.3 Test requirements. When tested in accordance with the methods listed in column5 of Table 3, type2 covers shall have the values given in columns3 and4 of Table 3 for the characteristics specified therein. Figure 1 Diagrammatic sketch of seatBS1254:1981 4 BSI 08-1999 Table 2 Test requirements for type2 seats 12 Buffers for type1
