INTERNATIONAL ISO
STANDARD 440- 1
First edition
1994-10-01
Thermoplastics pipes and fittings -
Determination of melt mass-flow rate -
Part 1:
iTeh STANDARD PREVIEW Test method
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Tubes et raccords en matjeres thermoplastiques - Determination de
ISOfluidite
Iindice de 4440-1:1994
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Partie 7: Methode d’essai
16de1a469231/iso-4440-1-1994
Reference number
ISO 4440-1:1994(E)
ISO 4440=1:1994(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote. iTeh STANDARD PREVIEW
International Standard (standards.iteh.ai)
ISO 4440-1 was prepared by Technical Committee
lSO/TC 138, Plastics pipes, fittings and valves for the transport of fluids,
Subcommittee SC 5, Genera/ properties of pipes, ISO fittings and valves of
4440-1:1994
plastic materials and their accessories - Test methods and basic specifi-
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ca tions. 16de1a469231/iso-4440-1-1994
This first edition of ISO 4440-1, together with ISO 4440-2:1994, cancels
and replaces ISO 4440:1980, which has been technically revised.
ISO 4440 consists of the following Parts, under the general title Thermo-
plastics pipes and fittings - Determination of melt mass-flow rate:
- Part 1: Test method
- Part 2: Test conditions
0 ISO 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, rncluding photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 8 Switzerland
Printed in Switzerland
ii
INTERNATIONAL STANDARD 0 ISO ISO 4440-1: 1994( E)
Thermoplastics pipes and fittings - Determination of
melt mass-flow rate -
Part 1:
Test method
1 Scope
This part of ISO 4440 specifies a method for determining the melt mass-flow rate (MFR) of polyolefin materials
made into pipes or fittings.
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lt is applicable to all polyolefin materials characterized by such methods, as detailed in ISO 4440-2.
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2 Normative references ISO 4440-1:1994
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The following Standards contain provisions16de1a469231/iso-4440-1-1994
which, through reference in this text, constitute
provisions of this part
of ISO 4440. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and
Parties to agreements based on this part of ISO 4440 are encouraged to investigate the possibility of applying the
most recent editions of the Standards indicated below. Members of IEC and ISO maintain registers of currently
valid International Standards.
ISO 1133:1991, Plastics - Determination of the melt mass-flow rate (MFß) and the melt volume-flow rate (MVß)
of thermoplastics.
ISO 4440-2: 1994, Thermoplastics pipes and fittings - Determination of melt mass-flow rate - Part 2: Test con-
ditions.
3 Principle
The mass of material is determined which Passes through a die of given diameter, under a specified pressure and
at a constant temperature, during a predetermined time.
4 Apparatus
4.1 Extrusion plastometer, complying with ISO 1133.
5 Test samples
The test samples shall comprise of granules in the approximate ferm of 3-mm-sided cubes, produced by cutting
or grinding a piece of the pipe or fitting for which the melt-flow rate is to be measured.
ISO 4440-1: 1994(E)
6 Procedure
Use procedure A given in ISO 1133.
7 Expression of results
The melt-flow rate (MFR), expressed in grams per 10 min, is given by the following equation:
MFR(B, PZ,,& =F
where
8 is the test temperature, in degrees Celsius;
mnOM is the nominal load, in kilograms;
tref is the reference time (10 min), in seconds (600 s);
m is the average mass of the extrudate tut-offs, in grams;
t is the interval between two cuts of an extrudate, in seconds.
Express the results to two significant figures.
8 Test report
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The test report shall include the following information:
PREVIEW
a) a reference to this part of ISO 4440;
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ISO 4440-1:1994
b) complete identification of the pipe or fitting tested;
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16de1a469231/iso-4440-1-1994
d the Chemical nature and physical form of the material with which the cylinder is charged;
d) details of any conditioning;
e) the diameter of the die, the temperature and the load used to carry out the test;
f ) the melt-flow rate;
9) details of any unsual behaviour of the test specimen, such as decomposition, sticking, distortion of the
extrudate or an unexpected Variation in the melt-flow rate.
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ISO 4440=1:1994(E)
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ICS 23.040.20; 23.040.45
Descriptors: pipes (tubes), pipe fittings, plastics products, thermoplastic resins, plastic tubes, tests, determination, melting.
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