Bsi bs en 00637 1995 (2000) bs 2782 12 mtd 1205a 1995

www bzfxw com BRITISH STANDARD BS EN 637 1995 BS 2782 12 Method 1205A 1995 Plastics piping systems — Glass reinforced plastics components — Determination of the amounts of constituents using the gravi[.]

BS 2782-12: Method 1205A: 1995

Plastics piping

systems —

Glass-reinforced

plastics components —

Determination of the

amounts of

constituents using the

gravimetric method

The European Standard EN 637:1994 has the status of a

British Standard

UDC 621.643.2-0.36:620.1:543.21

BS EN 637:1995

This British Standard, having

been prepared under the

direction of the Sector Board

for Materials and Chemicals,

was published under the

authority of the Standards

Board and comes

into effect on

15 July 1995

© BSI 01-2000

The following BSI references

relate to the work on this

standard:

Committee reference PRI/61

Draft for comment 92/37652 DC

ISBN 0 580 24132 7

Committees responsible for this British Standard

The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics piping systems and components, upon which the following bodies were 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 Agrément) Department of the Environment (Building Research Establishment) Department of the 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 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 Services Association of England and Wales The following bodies were also represented in the drafting of the standard, through subcommittees and panels:

Association of Consulting Engineers Engineering Equipment and Materials Users’ Association Institution of Civil Engineers

RAPRA Technology Ltd

Water Research Centre

Amendments issued since publication

Amd No Date Comments

© BSI 01-2000 i

Contents

Page

BS EN 637:1995

National foreword

This British Standard has been prepared under the direction of the Sector Board for Materials and Chemicals and is the English language version of EN 637:1994

Plastics piping systems — Glass-reinforced plastics components — Determination

of the amounts of constituents using the gravimetric method, published by the

European Committee for Standardization (CEN)

It is incorporated into BS 2782 Methods of testing plastics — Part 12 Reinforced

plastics pipes, fittings and valves, as Method 1205A:1995, for association with

related test methods for plastics materials and plastics piping components This test method has been prepared for reference by other standards under preparation by CEN for specification of reinforced plastics piping systems and components It has been implemented to enable experience of the method to be gained and for use for other fresh applications

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 revised to make reference to this method and adjust any requirements as appropriate

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 5 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 April 1994

UDC 621.643.2-036:620.1:543.21 Incorporates corrigendum January 1995 Descriptors: Pipelines, piping, plastic tubes, thermosetting resin, reinforced plastics, glass, components, determination of content,

gravimetric analysis

English version Plastics piping systems — Glass-reinforced plastics

components — Determination of the amounts of

constituents using the gravimetric method

Systèmes de canalisations en plastique —

Composants plastiques renforcés de verre —

Détermination des teneurs des constituants

par la méthode gravimétrique

Kunststoff-Rohrleitungssysteme — Teile aus glasfaserverstärkten Kunststoffen —

Ermittlung der Gehalte von Bestandteilen mit Hilfe des gravimetrischen Verfahrens

This European Standard was approved by CEN on 1994-04-27 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

© 1994 Copyright reserved to CEN members

Ref No EN 637:1994 E

EN 637:1994

© BSI 01-2000

2

Foreword

This standard was prepared by CEN/TC 155,

Plastics piping systems and ducting systems

This standard is a modification of the Draft

International Standard ISO/DIS 7510 Pipes and

fittings of glass-fibre reinforced thermosetting

plastics (GRP) — Analysis of constituents —

Gravimetric method, prepared by the International

Organization for Standardization (ISO)

The modifications are of an editorial nature

The material-dependent parameters and

requirements are incorporated in the referring

standard(s)

No existing European Standard is superseded by

this standard

This standard is one of a series of standards on test

methods which support system standards for

plastics piping systems and ducting systems

This standard shall be given the status of a national

standard, either by publication of an identical text

or by endorsement, at the latest by October 1994,

and conflicting national standards shall be

withdrawn at the latest by October 1994

According to the CEN/CENELEC Internal

Regulations, the following countries are bound to

implement this standard: Austria, Belgium,

Denmark, Finland, France, Germany, Greece,

Iceland, Italy, Luxembourg, Netherlands, Norway,

Portugal, Spain, Sweden, Switzerland,

United Kingdom

1 Scope

This standard specifies a method for the

determination of constituent materials of a test

sample cut from a glass-reinforced plastics (GRP)

component intended for use in a piping system It

includes determination of resin, glass, aggregate

and filler contents, and determination of the type

and arrangement of the constituent glass layers

Two burning temperatures are given, related to the

stability of the glass reinforcement at elevated

temperatures

Application to other composite components should

be considered in the referring standard

2 Principle

A test piece of known size and mass is heated to

burn off the resin, and the residue is analysed by

separating and weighing the constituents

NOTE 1 In the case of filled laminates, especially those

containing fillers of small particle size (including thixotropic

agents), accurate analysis of the constituents may prove difficult

This is because of the difficulty in separating such fillers from the

other constituents and the risk of some filler being lost during

combustion.

NOTE 2 It is assumed that the following test parameters are

set by the standard making reference to this standard:

a) whether or not the types of glass reinforcement are to be

separated [see item c) of 5.6 and item h) of clause 7];

b) details of the grammage and/or presence of synthetic fibre

veil, if known (see 5.8 and 6.6);

c) whether or not the glass content of each layer is to be

determined (see 6.2);

d) whether or not the filler content is to be determined

(see 6.5).

3 Apparatus

3.1 Crucible, of a suitable material and dimensions

(see 4.1).

3.2 Oven, capable of maintaining a temperature

of 105 °C to 110 °C

3.3 Electric muffle furnace, or microwave furnace,

capable of maintaining a temperature

between 450 °C and 650 °C with an accuracy

of ± 20 °C

3.4 Bunsen burner

3.5 Desiccator

3.6 Balance, accurate to 1 mg.

3.7 Sieves, of suitable mesh [see 5.6 b)].

4 Test piece

4.1 Dimensions

The dimensions of the test piece shall be in accordance with the manufacturer’s recommendations but not less than 60 mm

by 40 mm in area and shall be the full thickness of the component from which the test piece was taken

It shall be cut square, have smooth edges and be free from dust

4.2 Number

The number of test pieces shall be as specified in the referring standard

5 Procedure

NOTE Conditioning of the test piece is not required.

5.1 Measure the axial and circumferential dimensions of the test piece to the nearest 0,1 mm

Calculate and record the area A, in square metres.

5.2 Heat the crucible in the furnace to (625 ± 20) °C for 15 min Cool in the desiccator and weigh to the

nearest 10 mg Record the mass, in grams, as m1

5.3 If a test piece is derived from a component within 36 h of manufacture, the following drying procedure may be omitted (in which case proceed

to 5.4), otherwise dry the test piece as follows.

Heat the crucible and test piece in the oven to between 105 °C to 110 °C for 2 h Cool the crucible and test piece in the desiccator and weigh to the nearest 10 mg

Repeat the heating for periods of 30 min until the mass is constant to within 10 mg Record this total

mass, m2, in grams

5.4 Heat the crucible and test piece in a bunsen flame, a muffle or microwave furnace until the contents ignite Maintain the temperature so that the test piece burns uniformly

Take care to prevent the combustion proceeding so rapidly that there is a loss of non-combustible residue, such as filler

CAUTION Avoid breathing the potentially noxious vapours

5.5 Heat the crucible and residue in the muffle or microwave furnace at (625 ± 20) °C, or, if the reinforcement is unstable at 625 °C,

at (550 ± 20) °C until all carbonaceous material has disappeared Cool the crucible and residue in the desiccator and weigh these to the nearest 10 mg

Repeat these operations until a mass constant to

within 10 mg is obtained Record the total mass m3,

in grams

NOTE The time taken for the carbonaceous residue to disappear is largely dependent on the test piece shape It can

be 6 h or more, but is usually much less.

EN 637:1994

5.6 Separate off the residue m3 into its constituents

as follows:

a) separate the layers using tweezers or a

spatula, noting the number of layers and their

layout;

b) for each layer, separate its constituents by

scraping, shaking, brushing and/or sieving;

NOTE If the quantity of filler is to be determined then

suitable analytical techniques should be employed to separate

the filler from the other residue.

c) if required, separate the various types of glass

reinforcement

5.7 Determine the masses of the constituents as

follows:

a) weigh the aggregate to the nearest 10 mg and

record the mass m4, in grams;

b) to the nearest 10 mg, weigh and record the

total mass of glass, m5t, in grams, and, if

required, weigh to the nearest 10 mg the various

types of glass and record the corresponding

masses as m5a, m5b, etc., in grams;

c) weigh the filler to the nearest 10 mg and record

the mass m6, in grams

5.8 If the presence and grammage of any synthetic

fibre veil included in the construction of the

laminate is known or can be determined, estimate

its mass, in grams, from the area of the test piece

and the mass per unit area of the veil used Record

the estimated mass m7, in grams

6 Calculation and expression of results

6.1 Calculate the total glass content, ÒG,t, expressed

as a percentage by mass, using the following

equation:

6.2 If required, calculate the glass content of each

individual layer, ÒG,a, ÒG,b, ÒG,c, , expressed as a

percentage by mass, using the applicable equation

from the following series:

6.3 Calculate the resin content, ÒR, expressed as a

percentage by mass, using the following equation:

NOTE The determined mass of resin will include any glass

sizing removed during combustion.

6.4 Calculate the aggregate content, ÒA, expressed

as a percentage by mass, using the following equation:

6.5 If required, calculate the filler content, ÒF, expressed as a percentage by mass, using the following equation:

6.6 Calculate the estimated synthetic veil content

(see 5.8), Òv, expressed as a percentage by mass, using the following equation:

6.7 Calculate the total mass of glass, mG,t, in grams per square metre, of the laminate using the

following equation:

6.8 If required, calculate the individual masses of

glass, mG,a, mG,b, mG,c, , in grams per square metre,

of each individual layer of the laminate using the applicable equation from the following series:

7 Test report

The test report shall include the following information:

a) a reference to this standard and the referring standard;

b) the identification of the component tested;

c) the dimensions of each test piece;

d) the test temperatures (see 5.5);

e) whether preliminary drying (see 5.2) was

carried out;

f) the percentage by mass of the constituents of the laminate;

g) the total mass of glass, mG,t, of the laminate,

in grams per square metre;

h) if required, the number of layers, and the type, disposition, layout and individual percentage by mass of each individual glass layer;

i) observations with regard to any irregularities

noted during the test such as excessively rapid

combustion (see 5.4) or glass instability (see 5.5);

j) any factors which may have affected the

results, such as any incidents or any operating

details not specified in this standard;

k) the date of test

BS EN

637:1995

BS 2782-12:

Method 1205A:

1995

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