1、CEN EN*727 94 m 3404589 0094343 T7T m BRITISH STANDARD grri Plastics piping and ducting systems - Thermoplastics pipes and fittings - Determination of Vicat softening temperature (VST) The European Standard EN 727 : 1994 has the status of a British Standard UDC 621.643.06 : 621.642.2.036.073 : 620.1
2、 : 636.421.2 BS EN 727 : 1995 BS 2782 : Part 11 : Method 1103V : 1995 CEN EN*727 94 = 3404589 009V344 90b BS EN 727 : 1995 published under the authority of the Standards Board and Amd. No. Date comes into effect on 15 June 1995 O BSI 1995 The following BSI references reiate to the work on this stand
3、ard: Committee reference PRY61 Draft for comment 92/41378 DC ISBN O 580 23986 1 Committees respansible for this British Standard lxt affected The preparation of this British Standard was entrusted to lchnical Committee PRY61, Plastic piping systems and components, upon which the following bodies wer
4、e represented: British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Department of the Environment (British Board of Agrment) Department of the Environment (Building Research Establishment) Department of t
5、he Environment (Property and Buildings Directorate) Department of Transport Electricity Association Federation of Civil Engineering Contractors Health and Safety Executive Institute of Building Control Institute of Materials institution of Civil Engineers Institution of Gas Engineers Institution of
6、Water and Environmental Management National Association of Plumbing, Heating and Mechanical Services Pipeline Industries Guild Plastics Land Drainage Manufacturers Assocociation Society of British Gas Industries Society of British Water Industries Water Companies Association Water Services Associati
7、on of England and Wales Contractors The following bodies were also represented in the drafting of the standard, through subcommittees and panels: ERA lchnology Ltd. Engineering Equipment and Materiais Users Association RAPRA lchnology Ltd. CEN EN*727 74 3404589 0094345 842 BS EN 727 : 1995 Contents
8、Page Committees responsible Inside front cover National foreword ii Method Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Rst pieces 3 6 Conditioning 4 7 Procedure 4 8 Test report 5 Figure 1 softening temperature 5 Schematic diagram of apparatus for the determination of
9、the Vicat i CEN EN*727 94 3404589 0094346 789 BS EN 727 : 1995 National foreword This British Standard has been prepared under the direction of Rchnical Committee PR1/61, and is the English language version of EN 727 : 1994 Plastics piping and ducting systems - Thmop2astics pipes and fittings - Dete
10、rmination of Vicat softening ternperature (WT), published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of testing plastics Part 11. Themnoplasticspipes, fittings and valves, as Method 1103V : 1995, for association with related test methods for plastics
11、 materials and plastics piping components. This test method has been prepared for reference by other standards under preparation by CEN for specification of plastics piping systems and components. It has been implemented to enable experience of the method to be gained and for use for other fresh app
12、lications. It is also for use for the revision or amendment of other national standards as practicable, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a different test method until that standard/specification has been amended or
13、revised to make reference to this method and adjust any requirements as appropriate. Cross-reference International Standard Corresponding British Standard IS0 306 : 1987 BS 2782 Methods of testing plastics Part 1 . Thermal properties Methods 120A, 120B, 120D and 120E : 1990 Determination of Vicat so
14、ftening tmperature of thermoplastics WARNING. This British Standard, which is the English language version of EN 727 : 1994, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate
15、safety precautions and the method should be operated only by trained personnel. Compliance with a British Standard does not of itself confer immunity from legal obligations. 11 CEN EN*2 94 I 3404587 0094347 bL5 EUROPEAN STANDARD EN 727 NORNEEUROPENNE EUROPISCHE NORM August 1994 UDC 621.643.O6:621.64
16、2.2-O36.O73:620.1:536.421.2 Descriptors: Plastic tubes, thermoplastic resins, pipe fittings, softening tests, softening point English version Plastics piping and ducting systems - Thermoplastics pipes and fittings - Determination of Vicat softening temperature (VST) Systmes de canalisations et de ga
17、ines plastiques - Tubes et raccords thermoplastiques - Dtermination de la temprature de ramollissement Vicat (VST) Kunststoff-Rohrleitungs- und Schutzrohrsysteme - Rohre und Formstcke aus Thermoplasten - Bestimmung der Vicat-Erweichungstemperatur (VST) This European Standard was approved by CEN on 1
18、994-08-22. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be ob
19、tained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Se
20、cretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Commit
21、tee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1994 Copyright reserved to CEN members Ref. No. EN 727 : 1994 E CEN EN*727 94 3404589 0094348 551 = Page 2 EN 727 : 1994 Foreword This standard was prepare
22、d by CEN/TC 155, Plastics piping systems and ducting systems. This standard is based on IS0 2507 : 1982 Unplasticized polyvinyl chlori - the test force and the loading procedure have been aligned with those of IS0 306 : 1987. - test parameters, except those common to ail plastics, are omitted; - no
23、material-dependent requirements are given; - editorial changes have been introduced; The material-dependent parameters and/or performance requirements are incorporated in the System Standard(s) concerned. No existing European Standard is superseded by this standard. This standard is one of a series
24、of standards on test methods which support System Standards for plastics piping systems and ducting systems. This standard has been prepared under a mandate given to CEN by the Commission of the European Communities and the European Free Trade Association, and supports essential requirements of the
25、EC Directive(s). In accordance with the CENXENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland,
26、 United Kingdom. CEN EN*727 94 m 3404589 0094349 498 W 1 Scope This standard specifies a method for determining the Vicat softening temperature (VST) of pipes and fittings (see note) of thermoplastics materials, based on method B of IS0 306 : 1987, i.e. using a force of (50 f 1) N and a rate of temp
27、erature increase of 50 OC/h. A measure of the temperature is obtainable only for those thermoplastics for which the softening becomes rapid. NOTE. The term fittings is intended to also cover valves and other ancillaries made of thermoplastics material(s). 2 Normative references This European Standar
28、d incorporates by dated or undated references provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to, or revisions of, any of these publications apply to
29、this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. IS0 306 : 1987 Phtics - Thermoplastics materials - Determination of Vcat softening temperature 3 Principle The temperature at which a st.an
30、dard indenting tip (see note 1 to 4.1) under a constant force of (50 f 1) N, penetrates 1 mm into the surface of a test piece cut from the wall of the pipe or fitting is determined when the temperature is raised at a uniform rate. The temperature at 1 mm penetration is quoted as VST in degrees Celsi
31、us. NOTE 1. It is assumed that the following test parameters are set by the standard making reference to this standard: a) if necessary, the temperature and time for predrying the test pieces (see 4.2 and clause 6); b) if necessary, the temperature to be used to flatten the lower segment of a test p
32、iece (see 5.2.3); c) if necessary, for testing a pipe or fitting, or a homogeneous layer therefrom, with a wall thickness less than 1,2 mm, the method of test piece preparation and mounting (see 5.2.3 and 7.2); d) for structured-wall pipes and fittings, the method of test piece preparation and mount
33、ing (see 5.2.3 and 7.2). “XE 2. It is assumed that the significance of results from measurements which vary by more than 2 OC will be dealt with by the referring standard. Page 3 EN 727 : 1994 4 Apparatus 4.1 Apparatus confming to chuse 4 of IS0 306 : 1987 as necessary for testing in accordance with
34、 method B when using a heating rate of (50 f 5) OC/h. For a schematic diagram, see figure 1. NOTE 1. IS0 306 : 1987 specifies the indenting tip as follows. Indenting tip, preferably of hardened steel, 3 mm long, of circular cross section, and area (1,000 * 0,015) mm2, fixed at the bottom of the rod.
35、 The lower surface of the indenting tip shall be plane and perpendicular to the axis of the rod and free from burrs. NOTE 2. The uniform rate of temperature rise can be obtained by controlling the heat either manually or automatically, although the latter is strongly recommended. If a cooling coil i
36、s used in the liquid of the heating bath, in order to reduce the time required to lower the temperature between two consecutive tests, it is necessary to remove or drain such a coil before starting a new test, as boiling of residual coolant can affect the rate of temperature rise. 4.2 Oven with air
37、circulation or other appropriate apparatus, if applicable (see clause S), capable of maintaining the temperature specified by the referring standard, for predrying and/or annealing the test pieces. 5 lkst pieces 5.1 Sampling 5.1.1 Pipes The test pieces shall consist of segments of rings, removed fro
38、m the pipe, limited by cross sections and having the following dimensions: - length: approximately 50 mm; - width: between 10 mm and 20 mm. 5.1.2 Fittings The test pieces shall consist of segments of rings removed from the socket(s) or the spigot(s) of the fitting, limited by cross sections with a l
39、ength as long as possible with a maximum of 50 mm. Where a fitting has no socket or spigots then the test piece shall be taken from a convenient section of the fitting. The width of each test piece shall be between 10 mm and 20 mm. The test pieces shall be cut from a zone which does not include a we
40、ld line, injection point or an insert. 5.2 Preparation 5.2.1 Wall thickness greater than 6 mm For a wall thickness greater than 6 mm, reduce the thickness to 6 mm by machining the outer surface only of the pipe or fitting, using a technique which does not cause tangible heating of the non-planar sur
41、faces of the test piece. NUTE. Reduction to 6 mm (not 4 mm as given in IS0 306) is considered sufficient for the purposes of this standard. If the socket of the fitting is threaded, machine the threaded part until a smooth surface is obtained. CEN EN*727 94 3404589 0094350 LOT Page 4 EN 727 : 1994 I
42、 I stir the liquid well during the test. 7.6 Note the temperature of the bath at which the indenting tip has penetrated into the test piece by (1 f 0,Ol) mm beyond its starting position, as noted or set in accordance with 7.4, and record it a5 the Vicat softening temperature (VST) of the test specim
43、en. 7.7 Express as the VST, in degrees Celsius, of the pipe or fitting under test the arithmetic mean of the VSTs of the test pieces tested. If the difference between the two results exceeds 2 OC, record the individual results (see item f) of clause 8) and repeat the test once using a further set of
44、 at least two test pieces (see 5.3). Page 5 EN 727 : 1994 8 Test report The test report shall include the following information: a) a reference to this standard and to the referring standard; b) a complete identification of the pipe or fitting tested; c) the thickness of the test pieces and, if appl
45、icable (see 5.2.3) , whether they consisted of two parts or were otherwise specified by the referring standard; d) the liquid or other heat-transfer medium; e) if any, the method(s) of predrying, annealing and conditioning used (see clause 6); f) the Vicat softening temperature (VST) (the average of
46、 the results) obtained for the pipe or fitting or, if the difference between results for single test pieces exceeded 2 OC, the result for each of the test pieces and the results of the repeat test; g) any alterations in the appearance of the test pieces before and after their immersion; h) any facto
47、rs which may have affected the results, such as any incidents or any operating details not specified in this standard; i) the date of test. CEN EN*727 94 IPI 3404589 0094352 T2 BS EN 727 : 1995 List of references See national foreword. Previous page is blank BS EN 727 : 1995 BS 2782 : Part 11 : Meth
48、od 1103V : 1995 BSI 389 Chiswick High Road London W4 4AL 9506 - 5 - 0.5k - FP - i* BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated b
49、y Royal Charter. Contract requirements 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. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. Any person who finds an inaccuracy or ambiguity while using this British Standard should bring it to the attention of the Quality Manager, BSI without delay so that the matter may be investigated swiftly
