00336863 PDF BRITISH STANDARD BS EN 579 1994 BS 2782 11 Method 1106E 1994 Plastics piping systems — Crosslinked polyethylene (PE X) pipes — Determination of degree of crosslinking by solvent extractio[.]
BRITISH STANDARD Plastics piping systems — Crosslinked polyethylene (PE-X) pipes — Determination of degree of crosslinking by solvent extraction The European Standard EN 579:1993 has the status of a British Standard UDC 621.643.2-036.742.2:620.1:543.832 BS EN 579:1994 BS 2782-11: Method 1106E: 1994 BS EN 579:1994 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: This British Standard, having been prepared under the direction of the Plastics and Rubber Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1994 © BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PRM/61 Draft for comment 91/48474 DC ISBN 580 22265 Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y France Association franỗaise de normalisation Germany Deutsches Institut für Normung e.V Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugs da Qualidade Spain Asociación Espola de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd No Date Comments BS EN 579:1994 Contents Cooperating organizations National foreword Foreword Scope Principle Material Apparatus Test pieces Procedure Calculation and expression of results Test report National annex NA (informative) Committees responsible © BSI 12-1999 Page Inside front cover ii 3 3 3 4 Inside back cover i BS EN 579:1994 National foreword This British Standard has been prepared under the direction of the Plastics and Rubber Standards Policy Committee and is the English language version of EN 579:1993 Plastics piping systems — Crosslinked polyethylene (PE-X) pipes — Determination of degree of crosslinking by solvent extraction, published by the European Committee for Standardization (CEN) It is incorporated into BS 2782 Methods of testing plastics — Part 11: Thermoplastics pipes, fittings and valves, as Method 1106E:1994 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 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, the EN title page, pages to 4, 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 ii © BSI 12-1999 EUROPEAN STANDARD EN 579 NORME EUROPÉENNE July 1993 EUROPÄISCHE NORM UDC 621.643.2-036.742.2:620.1:543.832 Descriptors: Plastics, pipes, polyethylene, crosslinked, tests, determination, extraction, solvent English version Plastics piping systems — Crosslinked polyethylene (PE-X) pipes — Determination of degree of crosslinking by solvent extraction Systèmes de canalisations en plastiques — Tubes et polyéthylène réticulé (PE-X) Détermination du taux de gel par extraction solvant Kunststoff-Rohrleitungssysteme — Rohre aus vernetztem Polyethylen (PE-X) — Bestimmung des Vernetzungsgrades durch Lösemittelextraktion This European Standard was approved by CEN on 1993-06-25 CEN members are bound to comply with the CEN/CENELEC 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 obtained 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 Secretariat 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 Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1993 Copyright reserved to CEN members Ref No EN 579:1993 E EN 579:1993 Foreword This standard was prepared by CEN/TC 155 “Plastics piping systems and ducting systems” This standard is based on a proposal for a draft International Standard ISO/DP 10147 “Crosslinked polyethylene (PE-X) pipes — Degree of crosslinking as determined by solvent extraction” prepared by the International Organization for Standardization (ISO) It is a modification of ISO/DP 10147 for reasons of applicability to a variety of such materials and for alignment with texts of other standards on test methods This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 1994, and conflicting national standards shall be withdrawn at the latest by January 1994 The modifications are: — no process-dependent product requirements are given; — editorial changes have been introduced The material-dependent test parameters and/or performance requirements are incorporated in the referring standard(s) No existing European Standard is superseded by this standard The standard was approved and in accordance with the CEN/CENELEC 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, United Kingdom © BSI 12-1999 EN 579:1993 Scope This standard specifies a method for the determination by solvent extraction, of the degree of crosslinking of crosslinked polyethylene (PE-X) pipe It is applicable to pipes of PE-X not containing filler soluble in xylene It shall be washed with acetone and dried before use 4.7 Vacuum oven or oven with forced ventilation, capable of maintaining the applicable conditions (see 6.6) Test pieces Principle 5.1 Preparation of test pieces A test piece is immersed in a specific boiling solvent for a specific period of time and the proportion by mass of insoluble material is measured The percentage of insoluble material is used to express the degree of crosslinking The test piece shall be taken in the form of a shaving of (0,2 ± 0,02) mm thickness from the end of a pipe section The width of the shaving shall correspond to the wall thickness of the pipe and the length shall be at least equal to one circumference NOTE It is assumed that the following test parameter is set by the standard making reference to this standard: — if necessary, the number of test pieces (see 5.2) Material Solvent, comprising analytically pure xylene, to which % antioxidant [2,2½-methylene-bis(4-methyl-6-tert-butylphenol)] has been added WARNING Xylene is a harmful and flammable solvent which can be absorbed through the skin and as such should be handled and disposed of carefully and in accordance with applicable environmental rules Attention is drawn to any relevant regulations and associated exposure limits Expose only in a ventilated hood Check the effectiveness of the hood before starting the tests Do not inhale the vapour Excessive inhalation of the vapour may cause dizziness, or headache, or both In the event of excessive inhalation, seek fresh clean air Apparatus 4.1 Round bottom flask, of at least 500 ml capacity and having a sufficiently large mouth to admit a test piece (see clause 5) 4.2 Heating mantle, to fit the flask (see 4.1) and with sufficient heating capacity to boil xylene (boiling range 130 °C to 140 °C) 4.3 Reflux condenser, with joint to fit the flask 4.4 Ring stand and appropriate clamps 4.5 Lathe with a sharp blade, suitable for machining the test piece from the pipe (see clause 5) 4.6 Cage with lid, large enough to contain a test piece (see clause 5) The cage shall be made of wire cloth or mesh, of aluminium or stainless steel, with a pore size of (125 ± 25) Èm The wire cloth or mesh shall be free of grease, oils or other contaminants © BSI 12-1999 NOTE It is recommended that a lathe is used to obtain the shaving 5.2 Number of test pieces Unless otherwise specified in the referring standard, at least two test pieces shall be used Procedure 6.1 Weigh a clean, dry cage and lid (see 4.6) to the nearest mg, as mass m1 6.2 Place a test piece (see 5.1) in the cage and weigh the cage, lid and test piece together to the nearest mg, as mass m2 6.3 Place the cage, complete with lid and test piece, in the flask and ensure that there is sufficient solvent (see clause 3): a) to maintain total immersion of the cage; b) to provide a ratio by mass of solvent to test piece of at least 500 : 6.4 Boil the solvent vigorously, to ensure good agitation, for h ± 6.5 Remove the cage, with lid and the residue of the test piece, from the boiling solvent and allow it to drain 6.6 Complete the drying of the cage, lid and residue together by placing them for h in either: a) a vacuum oven at (140 ± 2) °C under a vacuum (negative pressure) of at least 0,85 bar (85 kPa) (i.e approximately 0,15 bar (15 kPa) absolute pressure or less); or b) a forced-ventilation oven at (140 ± 2) °C with an adequate extraction facility 6.7 Cool the combination of cage, lid and residue to ambient temperature and determine their combined mass to the nearest mg, as mass m3 6.8 Repeat the procedure of 6.1 to 6.7 at least once, using a fresh test piece each time EN 579:1993 Calculation and expression of results 7.2 Calculate the average degree of crosslinking, G, 7.1 Calculate the degree of crosslinking of each test piece, Gi, as a percentage by mass of insoluble material, using the following equation: m – m1 G i = -× 100 m – m1 where: Gi is the degree of crosslinking of the individual test piece, expressed as a percentage; m1 is the mass of the cage and lid, in milligrams (see 6.1); m2 is the combined mass of the original test piece, cage and lid, in milligrams (see 6.2); m3 is the combined mass of the residue, cage and lid, in milligrams (see 6.7) from the individual results for Gi Test report The test report shall include the following information: a) a reference to this standard and to the referring standard; b) the identity of the test piece(s); c) the degree of crosslinking for each test piece Gi, and the average value, G, in percent; d) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard; e) the date of test Express the result for Gi to the nearest whole number © BSI 12-1999 BS EN 579:1994 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/61, upon which the following bodies were represented: British Board of Agrément British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers’ Association British Valve and Actuator Manufacturers’ Association Department of the Environment (Building Research Establishment) Department of the Environment (Construction Directorate) Department of the Environment (Property Services Agency) Department of Transport Electricity Association Engineering Equipment and Materials Users’ 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 Water and Environmental Management National Association of Plumbing, Heating and Mechanical Services Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers’ Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Research Centre Water Services Association of England and Wales The following body was also represented in the drafting of the standard, through subcommittees and panels: RAPRA Technology Ltd © BSI 12-1999 BS EN 579:1994 BS 2782-11: Method 1106E: 1994 BSI — British Standards Institution BSI is the independent national body responsible for 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