Bsi bs en 00579 1994 (1999)

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[.]

BS 2782-11: Method 1106E: 1994

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

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 0 580 22265 9

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:

Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y

France Association française 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 Portuguès da Qualidade Spain Asociación Española de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige

Switzerland Association suisse de normalisation United Kingdom British Standards Institution

Amendments issued since publication

© BSI 12-1999 i

Contents

Page

National annex NA (informative) Committees responsible Inside back cover

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 2 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

EUROPÄISCHE NORM July 1993

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

© BSI 12-1999 2

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 3

1 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

2 Principle

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

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).

3 Material

Solvent, comprising analytically pure xylene, to

which 1 % 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

4 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

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).

5 Test pieces 5.1 Preparation of test pieces

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 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

6 Procedure 6.1 Weigh a clean, dry cage and lid (see 4.6) to the

nearest 1 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 1 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 : 1

6.4 Boil the solvent vigorously, to ensure good agitation, for 8 h ± 5 min

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 3 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 1 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

7 Calculation and expression of results

7.1 Calculate the degree of crosslinking of each test

piece, Gi, as a percentage by mass of insoluble

material, using the following equation:

Express the result for Gi to the nearest whole

number

7.2 Calculate the average degree of crosslinking, G, from the individual results for Gi

8 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

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).

Gi m3–m1

m2–m1

- 100×

=

© BSI 12-1999

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

BS EN

579:1994

BS 2782-11:

Method 1106E:

1994

BSI

389 Chiswick High Road

London

W4 4AL

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 by Royal Charter

Revisions

British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions

It is the constant aim of BSI to improve the quality of our products and services

We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover

Tel: 020 8996 9000 Fax: 020 8996 7400

BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards

Buying standards

Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: 020 8996 9001 Fax: 020 8996 7001

In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested

Information on standards

BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre

Tel: 020 8996 7111 Fax: 020 8996 7048

Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details

of these and other benefits contact Membership Administration

Tel: 020 8996 7002 Fax: 020 8996 7001

Copyright

Copyright subsists in all BSI publications BSI also holds the copyright, in the

UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI

This does not preclude the free use, in the course of implementing the standard,

of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained

If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager Tel: 020 8996 7070