SIST EN ISO 1133-1:2012
(Main)Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics - Part 1: Standard method (ISO 1133-1:2011)
Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics - Part 1: Standard method (ISO 1133-1:2011)
This part of ISO 1133 specifies two procedures for the determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastic materials under specified conditions of temperature and load. Procedure A is a mass-measurement method. Procedure B is a displacement-measurement method. Normally, the test conditions for measurement of melt flow rate are specified in the material standard with a reference to this part of ISO 1133. The test conditions normally used for thermoplastics are listed in Annex A. The MVR is particularly useful when comparing materials of different filler content and when comparing filled with unfilled thermoplastics. The MFR can be determined from MVR measurements, or vice versa, provided the melt density at the test temperature is known. This part of ISO 1133 is also possibly applicable to thermoplastics for which the rheological behaviour is affected during the measurement by phenomena such as hydrolysis (chain scission), condensation and crosslinking, but only if the effect is limited in extent and only if the repeatability and reproducibility are within an acceptable range. For materials which show significantly affected rheological behaviour during testing, this part of ISO 1133 is not appropriate. In such cases, ISO 1133-2 applies.
Kunststoffe - Bestimmung der Schmelze-Massefließrate (MFR) und der Schmelze-Volumenfließrate (MVR) von Thermoplasten - Teil 1: Allgemeines Prüfverfahren (ISO 1133-1:2011)
Dieser Teil der ISO 1133 legt zwei Verfahren für die Bestimmung der Schmelze-Massefließrate (MFR) und
der Schmelze-Volumenfließrate (MVR) von thermoplastischen Materialien unter festgelegten Bedingungen für
Temperatur und Belastung fest. Verfahren A dient zum Bestimmen der Masse. Verfahren B ist ein Messverfahren
für die Weglänge. Üblicherweise sind die Prüfbedingungen für die Messung der Schmelze-Fließrate in
der Werkstoffnorm mit einem Verweis auf diesen Teil der ISO 1133 festgelegt. Die üblicherweise für
Thermoplaste angewendeten Bedingungen sind im Anhang A aufgelistet.
Die MVR erweist sich beim Vergleichen von Werkstoffen mit unterschiedlichen Füllstoffgehalten und beim
Vergleichen von gefüllten und ungefüllten Thermoplasten als besonders nützlich. Die MFR kann, falls die
Dichte der Schmelze bei der Prüftemperatur bekannt ist, aus MVR-Messungen bestimmt werden, oder
umgekehrt.
Dieser Teil der ISO 1133 ist auch auf Thermoplaste anwendbar, deren rheologisches Verhalten während der
Messung z. B. durch Hydrolyse (Kettenspaltung), Kondensation und Vernetzung beeinflusst wird, jedoch nur
dann, wenn diese Beeinflussung begrenzt ist und wenn die Wiederhol- und Vergleichspräzision innerhalb des
zulässigen Bereiches liegen. Für Werkstoffe, die bei der Prüfung ein deutlich beeinflusstes rheologisches
Verhalten aufweisen, ist dieser Teil der ISO 1133 nicht geeignet. In diesen Fällen gilt ISO 1133-2.
ANMERKUNG Die Schergeschwindigkeiten in diesen Verfahren sind wesentlich kleiner als diejenigen unter normalen
Verarbeitungsbedingungen, und daher korrelieren die Ergebnisse, die mit diesen Verfahren für die verschiedenen
Thermoplaste erhalten wurden, nicht immer mit ihrem Verhalten bei der Verarbeitung. Beide Verfahren werden in erster
Linie zur Qualitätskontrolle verwendet.
Plastiques - Détermination de l'indice de fluidité à chaud des thermoplastiques, en masse (MFR) et en volume (MVR) - Partie 1: Méthode normale (ISO 1133-1:2011)
L'ISO 1133-1:2011 spécifie deux modes opératoires pour la détermination de l'indice de fluidité à chaud en masse (MFR) et en volume (MVR) des matériaux thermoplastiques, dans des conditions définies de température et de charge. Le mode opératoire A est une méthode de mesurage de la masse. Le mode opératoire B est une méthode de mesurage du volume déplacé. En principe, les conditions d'essai pour la détermination de l'indice de fluidité à chaud sont spécifiées dans la norme relative au matériau avec une référence à l'ISO 1133-1:2011. Les conditions normalement utilisées pour l'essai des matériaux thermoplastiques sont énumérées en annexe.
Le MVR est particulièrement utile pour comparer des matériaux à teneur en charges différentes et pour comparer des thermoplastiques chargés avec ceux non chargés. Le MFR peut être déterminé à partir de mesurages MVR, ou inversement, à condition que la masse volumique à l'état fondu à la température d'essai soit connue.
L'ISO 1133-1:2011 peut également être applicable aux thermoplastiques dont le comportement rhéologique est affecté pendant le mesurage par des phénomènes tels que l'hydrolyse (scission de la chaîne), la condensation et la réticulation, mais uniquement si cet effet est d'ampleur limitée et seulement si la répétabilité et la reproductibilité sont comprises dans des limites acceptables. L'ISO 1133-1:2011 n'est pas appropriée aux matériaux dont le comportement rhéologique varie de façon significative pendant les essais. Dans de tels cas, l'ISO 1133-2 s'applique.
Polimerni materiali - Ugotavljanje masnega (MFR) in prostorninskega pretoka taline (MVR) plastomerov - 1. del: Standardna metoda (ISO 1133-1:2011)
Ta del standarda ISO 1133 določa dva postopka za ugotavljanje masnega (MFR) in prostorninskega (MVR) pretoka taline plastomerov pod določenimi pogoji temperature ter obremenitve. Postopek A je metoda za merjenje mase. Postopek B je metoda za merjenje premika. Običajno so preskusni pogoji za merjenje pretoka taline določeni v standardu za material s sklicevanjem na ta del standarda ISO 1133. Preskusni pogoji, ki se običajno uporabljajo za plastomere, so navedeni v dodatku A. Prostorninski pretok taline je zlasti uporaben pri primerjavi materialov z različno vsebnostjo polnila in primerjavi polnjenih plastomerov z nepolnjenimi. Masni pretok taline je mogoče ugotoviti z meritvami prostorninskega pretoka taline ali obratno, če je gostota taline pri preskusni temperaturi znana. Ta del standarda ISO 1133 je morda mogoče uporabiti tudi za plastomere, pri katerih se reološko obnašanje med merjenjem spremeni zaradi pojavov, kot so hidroliza (cepljenje verig), kondenzacija in prečno povezovanje, vendar le, če je obseg učinka omejen ter sta ponovljivost in obnovljivost v okviru sprejemljivih vrednosti. Za materiale z bistveno spremenjenim reološkim obnašanjem med preskušanjem ta del standarda ISO 1133 ni primeren. V takih primerih se uporablja standard ISO 1133-2.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 1133-1:2012
01-februar-2012
1DGRPHãþD
SIST EN ISO 1133:2005
SIST EN ISO 1133:2005/AC:2006
Polimerni materiali - Ugotavljanje masnega (MFR) in prostorninskega pretoka
taline (MVR) plastomerov - 1. del: Standardna metoda (ISO 1133-1:2011)
Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate
(MVR) of thermoplastics - Part 1: Standard method (ISO 1133-1:2011)
Kunststoffe - Bestimmung der Schmelze-Massefließrate (MFR) und der Schmelze-
Volumenfließrate (MVR) von Thermoplasten - Teil 1: Allgemeines Prüfverfahren (ISO
1133-1:2011)
Plastiques - Détermination de l'indice de fluidité à chaud des thermoplastiques, en
masse (MFR) et en volume (MVR) - Partie 1: Méthode normale (ISO 1133-1:2011)
Ta slovenski standard je istoveten z: EN ISO 1133-1:2011
ICS:
83.080.20 Plastomeri Thermoplastic materials
SIST EN ISO 1133-1:2012 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 1133-1:2012
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SIST EN ISO 1133-1:2012
EUROPEAN STANDARD
EN ISO 1133-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2011
ICS 83.080.20 Supersedes EN ISO 1133:2005
English Version
Plastics - Determination of the melt mass-flow rate (MFR) and
melt volume-flow rate (MVR) of thermoplastics - Part 1:
Standard method (ISO 1133-1:2011)
Plastiques - Détermination de l'indice de fluidité à chaud Kunststoffe - Bestimmung der Schmelze-Massefließrate
des thermoplastiques, en masse (MFR) et en volume (MFR) und der Schmelze-Volumenfließrate (MVR) von
(MVR) - Partie 1: Méthode normale (ISO 1133-1:2011) Thermoplasten - Teil 1: Allgemeines Prüfverfahren (ISO
1133-1:2011)
This European Standard was approved by CEN on 30 November 2011.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 1133-1:2011: E
worldwide for CEN national Members.
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SIST EN ISO 1133-1:2012
EN ISO 1133-1:2011 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 1133-1:2012
EN ISO 1133-1:2011 (E)
Foreword
This document (EN ISO 1133-1:2011) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.
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 June 2012, and conflicting national standards shall be withdrawn at
the latest by June 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 1133:2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 1133-1:2011 has been approved by CEN as a EN ISO 1133-1:2011 without any modification.
3
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SIST EN ISO 1133-1:2012
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SIST EN ISO 1133-1:2012
INTERNATIONAL ISO
STANDARD 1133-1
First edition
2011-12-01
Plastics — Determination of the melt
mass-flow rate (MFR) and melt volume-
flow rate (MVR) of thermoplastics —
Part 1:
Standard method
Plastiques — Détermination de l’indice de fluidité à chaud des
thermoplastiques, en masse (MFR) et en volume (MVR) —
Partie 1: Méthode normale
Reference number
ISO 1133-1:2011(E)
©
ISO 2011
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Principle .2
5 Apparatus .3
5.1 Extrusion plastometer .3
5.2 Accessory equipment .7
6 Test sample .8
6.1 Sample form .8
6.2 Conditioning .8
7 Temperature verification, cleaning and maintenance of the apparatus .9
7.1 Verification of the temperature control system .9
7.2 Cleaning the apparatus .10
7.3 Vertical alignment of the instrument .10
8 Procedure A: mass-measurement method .10
8.1 Selection of temperature and load .10
8.2 Cleaning .10
8.3 Selection of sample mass and charging the cylinder .10
8.4 Measurements .11
8.5 Expression of results .12
9 Procedure B: displacement-measurement method .13
9.1 Selection of temperature and load .13
9.2 Cleaning .13
9.3 Minimum piston displacement distance .13
9.4 Selection of sample mass and charging the cylinder .13
9.5 Measurements .13
9.6 Expression of results .14
10 Flow rate ratio .15
11 Precision .16
12 Test report .16
Annex A (normative) Test conditions for MFR and MVR determinations .18
Annex B (informative) Conditions specified in International Standards for the determination of the melt
flow rate of thermoplastic materials .19
Annex C (informative) Device and procedure for preforming a compacted charge of material by
compression .20
Annex D (informative) Precision data for polypropylene obtained from an intercomparison of MFR and
MVR testing .23
Bibliography .24
© ISO 2011 – All rights reserved iii
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(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. Each 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 1133-1 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical
properties.
This first edition of ISO 1133-1 cancels and replaces ISO 1133:2005. It also incorporates the Technical
Corrigendum, ISO 1133:2005/Cor.1:2006.
In this part of ISO 1133, changes have been made to accommodate ISO 1133-2. In addition: Clause 3 includes
further definitions relevant to both parts of ISO 1133; 5.1.3 specifies the lower edge of the piston head; 5.1.4
updates temperature tolerances; 5.2.1.7 on a preforming device has been added; 5.2.2.2 includes revised
cut-off timing accuracy; 8.3 provides cut-off time intervals that are consistent with other specifications in this
part of ISO 1133; 8.5.3 and 9.6.3 have been included on expression of half die results; 9.3 provides minimum
piston displacements that are consistent with other specifications in this part of ISO 1133; Annex B has been
simplified to avoid inconsistencies between this and the materials specification standards; Annex C, has been
added for the preparation of charges of material that is particularly suited to testing flake or other large aspect
ratio particles; Annex D has been added to provide precision data from an intercomparison on a high MVR/MFR
material.
This part of ISO 1133 applies to melt flow rate testing broadly equivalent to that of ISO 1133:2005. ISO 1133-2
applies to the testing of polymers that are rheologically sensitive to the time-temperature history to which they
are subjected during melt flow rate testing.
ISO 1133 consists of the following parts, under the general title Plastics — Determination of the melt mass-flow
rate (MFR) and melt volume-flow rate (MVR) of thermoplastics:
— Part 1: Standard method
— Part 2: Method for materials sensitive to time-temperature history and/or moisture
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
Introduction
For stable materials that are not rheologically sensitive to the time-temperature history experienced during melt
flow rate testing, this part of ISO 1133 is recommended.
For materials whose rheological behaviour is sensitive to the test’s time-temperature history, e.g. materials
which degrade during the test, ISO 1133-2 is recommended.
NOTE At the time of publication, there is no evidence to suggest that the use of ISO 1133-2 for stable materials
results in better precision in comparison with the use of this part of ISO 1133.
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SIST EN ISO 1133-1:2012
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SIST EN ISO 1133-1:2012
INTERNATIONAL STANDARD ISO 1133-1:2011(E)
Plastics — Determination of the melt mass-flow rate (MFR) and
melt volume-flow rate (MVR) of thermoplastics —
Part 1:
Standard method
WARNING — Persons using this document should be familiar with normal laboratory practice, if
applicable. This document does not purport to address all of the safety problems, if any, associated
with its use. It is the responsibility of the user to establish appropriate safety and health practices and
to ensure compliance with any regulatory requirements.
1 Scope
This part of ISO 1133 specifies two procedures for the determination of the melt mass-flow rate (MFR) and
the melt volume-flow rate (MVR) of thermoplastic materials under specified conditions of temperature and
load. Procedure A is a mass-measurement method. Procedure B is a displacement-measurement method.
Normally, the test conditions for measurement of melt flow rate are specified in the material standard with a
reference to this part of ISO 1133. The test conditions normally used for thermoplastics are listed in Annex A.
The MVR is particularly useful when comparing materials of different filler content and when comparing filled
with unfilled thermoplastics. The MFR can be determined from MVR measurements, or vice versa, provided
the melt density at the test temperature is known.
This part of ISO 1133 is also possibly applicable to thermoplastics for which the rheological behaviour is
affected during the measurement by phenomena such as hydrolysis (chain scission), condensation and cross-
linking, but only if the effect is limited in extent and only if the repeatability and reproducibility are within an
acceptable range. For materials which show significantly affected rheological behaviour during testing, this
part of ISO 1133 is not appropriate. In such cases, ISO 1133-2 applies.
NOTE The rates of shear in these methods are much smaller than those used under normal conditions of processing,
and therefore it is possible that data obtained by these methods for various thermoplastics will not always correlate with
their behaviour during processing. Both methods are used primarily in quality control.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 1133-2, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-rate (MVR) of
thermoplastics — Part 2: Method for materials sensitive to time-temperature history and/or moisture
ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions
and surface texture parameters
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
3.1
melt mass-flow rate
MFR
rate of extrusion of a molten resin through a die of specified length and diameter under prescribed conditions
of temperature, load and piston position in the cylinder of an extrusion plastometer, the rate being determined
as the mass extruded over a specified time
NOTE MFR is expressed in units of grams per 10 min. Alternative units accepted by SI are decigrams per minute,
where 1 g/10 min is equivalent to 1 dg/min.
3.2
melt volume-flow rate
MVR
rate of extrusion of a molten resin through a die of specified length and diameter under prescribed conditions
of temperature, load and piston position in the cylinder of an extrusion plastometer, the rate being determined
as the volume extruded over a specified time
NOTE MVR is expressed in units of cubic centimetres per 10 min.
3.3
load
combined force exerted by the mass of the piston and the added weight, or weights, as specified by the
conditions of the test
NOTE Load is expressed as the mass, in kilograms, exerting it.
3.4
preformed compacted charge
test sample prepared as a compressed charge of polymer sample
NOTE In order to introduce samples quickly into the bore of the cylinder and to ensure void-free extrudate, it may be
necessary to preform samples originally in the form of, for example, powders or flakes into a compacted charge.
3.5
time-temperature history
history of the temperature and time to which the sample is exposed during testing including sample preparation
3.6
standard die
die having a nominal length of 8,000 mm and a nominal bore diameter of 2,095 mm
3.7
half size die
die having a nominal length of 4,000 mm and a nominal bore diameter of 1,050 mm
3.8
moisture-sensitive plastics
plastics having rheological properties that are sensitive to their moisture content
NOTE Plastics which, when containing absorbed water and heated above their glass transition temperatures (for
amorphous plastics) or melting point (for semi-crystalline plastics), undergo hydrolysis resulting in a reduction in molar
mass and consequently a reduction in melt viscosity and an increase in MFR and MVR.
4 Principle
The melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) are determined by extruding molten
material from the cylinder of a plastometer through a die of specified length and diameter under preset
conditions of temperature and load.
For measurement of MFR (procedure A), timed segments of the extrudate are weighed and used to calculate
the extrusion rate, in grams per 10 min.
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
For measurement of MVR (procedure B), the distance that the piston moves in a specified time or the time
required for the piston to move a specified distance is recorded and used to calculate the extrusion rate in cubic
centimetres per 10 min.
MVR can be converted to MFR, or vice versa, if the melt density of the material at the test temperature is
known.
NOTE The density of the melt is required at the test temperature and pressure. In practice, the pressure is low and
values obtained at the test temperature and ambient pressure suffice.
5 Apparatus
5.1 Extrusion plastometer
5.1.1 General. The basic apparatus comprises an extrusion plastometer operating at a fixed temperature.
The general design is as shown in Figure 1. The thermoplastic material, which is contained in a vertical cylinder,
is extruded through a die by a piston loaded with a known weight. The apparatus consists of the following
essential parts.
5.1.2 Cylinder. The cylinder shall have a length between 115 mm and 180 mm and an internal diameter of
(9,550 � 0,007) mm and shall be fixed in a vertical position (see 5.1.6).
The cylinder shall be manufactured from a material resistant to wear and corrosion up to the maximum
temperature of the heating system. The bore shall be manufactured using techniques and materials that produce
a Vickers hardness of no less than 500 (HV 5 to HV 100) (see ISO 6507-1) and shall be manufactured by a
technique that produces a surface roughness of less than Ra (arithmetical mean deviation) equal to 0,25 µm
(see ISO 4287). The finish, properties and dimensions of its surface shall not be affected by the material being
tested.
NOTE 1 For particular materials, it is possible that measurements will be required at temperatures up to 450 °C.
The base of the cylinder shall be thermally insulated in such a way that the area of exposed metal is less than
2
4 cm, and it is recommended that an insulating material such as AlO, ceramic fibre or another suitable
2 3
material be used in order to avoid sticking of the extrudate.
A piston guide or other suitable means of minimizing friction due to misalignment of the piston shall be provided.
NOTE 2 Excessive wear of the piston head, piston and cylinder and erratic results can be indications of misalignment of
the piston. Regular visual checking for wear and change to the surface appearance of the piston head, piston and cylinder
is recommended.
5.1.3 Piston. The piston shall have a working length at least as long as the cylinder. The piston shall have a
head (6,35 � 0,10) mm in length. The diameter of the head shall be (9,474 � 0,007) mm. The lower edge of the
00,
piston head shall have a radius of (04, ) mm and the upper edge shall have its sharp edge removed. Above
−01,
the head, the piston shall be relieved to �9,0 mm diameter (see Figure 2).
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
Key
1 insulation
2 removable weight
3 piston
4 upper reference mark
5 lower reference mark
6 cylinder
7 piston head
8 die
9 die retaining plate
10 insulating plate
11 insulation
12 temperature sensor
Figure 1 — Typical apparatus for determining melt flow rate, showing one possible configuration
The piston shall be manufactured from a material resistant to wear and corrosion up to the maximum temperature
of the heating system, and its properties and dimensions shall not be affected by the material being tested.
To ensure satisfactory operation of the apparatus, the cylinder and the piston head shall be made of materials
of different hardness. It is convenient for ease of maintenance and renewal to make the cylinder of the harder
material.
Along the piston stem, two thin annular reference marks shall be scribed (30 � 0,2) mm apart and so positioned
that the upper mark is aligned with the top of the cylinder when the distance between the lower edge of the
piston head and the top of the standard die is 20 mm. These annular marks on the piston are used as reference
points during the measurements (see 8.4 and 9.5).
A stud may be added at the top of the piston to position and support the removable weights, but the piston shall
be thermally insulated from the weights.
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
The piston may be either hollow or solid. In tests with very low loads the piston may need to be hollow,
otherwise it may not be possible to obtain the lowest prescribed load.
Table 1 — Dimensions of piston head
Dimensions in millimetres
Length of head, A 6,35 � 0,10
Diameter of head, B 9,474 � 0,007
Diameter of stem, C �9,0
00,
Radius of lower edge, R
04,
−01,
a
Sharp edge removed.
Figure 2 — Schematic of piston head
5.1.4 Temperature-control system. For all cylinder temperatures that can be set, the temperature control
shall be such that between (10 � 1) mm and (70 � 1) mm above the top of the standard die, the temperature
differences measured do not exceed those given in Table 2 throughout the duration of the test.
NOTE The temperature can be measured and controlled with, for example, thermocouples or platinum-resistance
sensors embedded in the wall of the cylinder. If the apparatus is equipped in this way, it is possible that the temperature is
not exactly the same as that in the melt, but the temperature-control system can be calibrated (see 7.1) to read the in-melt
temperature.
The temperature-control system shall allow the test temperature to be set in steps of 0,1 °C or less.
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SIST EN ISO 1133-1:2012
ISO 1133-1:2011(E)
Table 2 — Maximum allowable deviation from required test temperature
with distance and with time over the duration of the test
Temperatures in degrees Celsius
a
Maximum permitted deviation from the required test temperature:
Test
at (10 � 1) mm above the top surface of the from (10 � 1) mm to (70 � 1) mm above the
temperature, T
b b
standard die top surface of the standard die
c
125 � T � 250 �1,0 �2,0
c
250 � T � 300 �1,0 �2,5
300 � T �1,0 �3,0
a
The maximum permitted deviation from the required test temperature is the difference between the true value of temperature
and the required test temperature. It shall be assessed over the normal duration of a test, typically less than 25 min.
b
When using a 4 mm length half size die (see 5.1.5), the readings shall be made an additional 4 mm above the top surface of the
die.
c
For test temperatures �300 °C, the temperature at 10 mm above the top surface of the die shall not vary with time by greater
than 1 °C in range.
5.1.5 Die. The die shall be made of tungsten carbide or hardened steel. For testing potentially corrosive
materials, dies made of cobalt-chromium-tungsten alloy, chromalloy, synthetic sapphire or other suitable
materials may be used.
The die shall be (8,000 � 0,025) mm in length. The interior of the bore shall be manufactured circular, straight
and uniform in diameter such that in all positions it is within �0,005 mm of a true cylinder of diameter 2,095 mm.
The bore shall be hardened by a technique that produces a Vickers hardness of no less than 500 (HV 5 to
HV 100) (see ISO 6507-1) and shall be manufactured by a technique that produces a surface roughness of less
than Ra (arithmetical mean deviation)
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