EN ISO 1133:1999

SLOVENSKI STANDARD
SIST EN ISO 1133:2000
01-maj-2000
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Plastics - Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate
(MVR) of thermoplastics (ISO 1133:1997)
Kunststoffe - Bestimmung der Schmelze-Massefließrate (MFR) und der Schmelze-
Volumenfließrate (MVR) von Thermoplasten (ISO 1133:1997)
Plastiques - Détermination de l'indice de fluidité a chaud des thermoplastiques, en
masse (MFR) et en volume (MVR) (ISO 1133:1997)
Ta slovenski standard je istoveten z: EN ISO 1133:1999
ICS:
83.080.20 Plastomeri Thermoplastic materials
SIST EN ISO 1133:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 1133:2000

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SIST EN ISO 1133:2000

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SIST EN ISO 1133:2000

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SIST EN ISO 1133:2000

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SIST EN ISO 1133:2000

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SIST EN ISO 1133:2000
IS0 1133:1997(E)
INTERNATIONAL STANDARD @ IS0
Determination of the melt mass-flow rate (MFR)
Plastics -
and the melt volume-flow rate (MVR) of thermoplastics
1 Scope
1.1 This International Standard specifies a method 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.
Normally, the test conditions for measurement of melt flow rate are specified in the material standard with a
reference to this International Standard. The test conditions normally used for thermoplastics are listed in annexes
A and B. The melt volume-flow rate will normally be found useful when comparing filled and unfilled
thermoplastics. The melt flow rate can now be determined by automatic measurement provided the melt density
at the test temperature is known.
This method is not applicable to thermoplastics for which the rheological behaviour is affected by phenomena such
as hydrolysis, condensation or crosslinking.
1.2 The melt mass-flow rate and melt volume-flow rate of thermoplastics are dependent on the rate of shear. The
rates of shear in this test are much smaller than those used under normal conditions of fabrication, and therefore
data obtained by this method for various thermoplastics may not always correlate with their behaviour in actual
use. Both methods are useful in quality control.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
- Parameters, their values and general rules for specifying requirement.
IS0 468:1982, Surface roughness
- Polystyrene (PS) moulding and extrusion materials - Part 7: Designation system and
IS0 1622-l :I 994, Plastics
basis for specifications.
- Polyethylene (PE) moulding and extrusion materials - Part 7: Designation system and
IS0 1872-l :I 993, Plastics
basis for specifications.
IS0 1873-l :I 995, Plastics - Polypropylene (PP) moulding and extrusion materials - Part 7: Designation system
and basis for specifications.
IS0 2580-I :I 990, Plastics - Acrylonitrile/butadiene/styrene (AK) moulding and extrusion materials - Part 7:
Designation.
1

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SIST EN ISO 1133:2000
@ IS0
El
IS0 2897-l :I 990 P/as tics - Impact-resistant polystyrene (SB) moulding and extrusion materials - Part 7:
Designation.
- Ethylene/viny/ acetate (E/vAC) moulding and extrusion materials - Part 1:
IS0 4613-I :I 993, Plastics
Designation and specification.
- Styrene/acrylonitrile (SAN) copolymer moulding and extrusion materials - Part 1:
IS0 4894-l :I 990, Plastics
Designation.
IS0 6402-I :I 990, Plastics - Impact-resistant acrylonitrile/styrene moulding and extrusion materials (ASA, AES,
ACS), excluding butadiene-modified materials - Part 7: Designation.
-I), Metallic materials - Vickers hardness test - Part I: Test method.
IS0 6507-I:
IS0 7391-l:- 21, Plastics - Polycarbonate moulding and extrusion materials - Part I: Designation system and
basis for specifications.
IS0 8257-l :- 31, Plastics - Poly(methyl methacryla te) (PMMA) moulding and extrusion materials - Part I:
Designation sys tern and basis for specifications.
IS0 8986-l :I 993, Plastics - Polybutene (PB) moulding and extrusion materials - Part 7: Designation system and
basis for specifications.
IS0 9988-l : 1991, Plastics - Polyoxymethylene (POM) moulding and extrusion materials - Part 7: Designation.
IS0 10366-I :I 993, Plastics - Methyl methacrylate/acrylonitrile/butadiene/styrene (MABS) moulding and extrusion
,
materials - Part I: Designation system and basis for specifications.
3 Apparatus
3.1 Basic apparatus
3.1.1 The apparatus is basically 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 loaded piston. The apparatus consists of the following essential parts:
3.1.2 Cylinder, fixed in a vertical position. The cylinder shall consist of a material resistant to wear and corrosion
up to the maximum temperature of the heating system and shall be inert to the test sample. For particular
materials, measurements may be required at temperatures up to 450 “C. The cylinder length shall be between
115 mm and 180 mm and the internal diameter 9,550 mm + 0,025 mm. The base of the cylinder shall be thermally
insulated in such a way that the area of the exposed metal is less than 4 cm*, and it is recommended that an
insulating material such as Al203 ceramic fibre or another suitable material be used in order to avoid sticking of the
extrudate.
The bore shall be hardened to a Vickers hardness of no less than 500 (HV 5 to HV 100) (see IS0 6507-I) and shall
have a surface roughness less than R, (arithmetic mean discrepancy) =
0,25 pm (see IS0 468). If necessary, a
piston guide shall be provided to keep friction caused by misalignment of the piston does not differ down to a level
at which the actual load from the nominal load by more than + 0,5 %.
3.1.3 Steel piston, having a working length at least as long as the cylinder. The piston shall have a head
6,35 mm + 0,lO mm in length. The diameter of the head shall be less than the internal diameter of the cylinder by
0,075 mm + 0,010 mm. The upper edge shall have its sharp edge removed. Above the head, the piston shall be
1) To be published. (Revision of IS0 6507-I :I 982, IS0 6507-2:1983, IS0 6507-3:1989, IS0 409-I :I 982, IS0 409-2:1983 and
lSO/DlS 409-3)
2) To be published. (Revision of IS0 7391-1 :I 987)
3) To be published. (Revision of IS0 8257-l :I 987)

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SIST EN ISO 1133:2000
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@ IS0
relieved to about 9 mm diameter. A stud may be added at the top of the piston to support the removable load, but
the piston shall be thermally insulated from the load. Along the piston stem, two thin annular reference marks shall
be scribed 30 mm apart and so positioned that the upper one is aligned with the top of the cylinder when the
distance between the lower edge of the piston head and the top of the die is 20 mm. These annular marks on the
piston are used as reference points during the determination (see 6.3 and 7.4).
the ratus, the cylinder and the pi ston sha II be made of mate rials of
To ensure satisfactory operation of
aPPa
different hardness. It is convenient for ease of ma inte nance and re newal to make the cylinde r of the harder
material.
The piston may be either hollow or solid. In tests with lower loads, the piston shall be hollow, otherwise it may not
be possible to obtain the lowest prescribed load. When the test is performed with the higher loads, the hollow
piston is not desirable, as the higher load may distort such a piston. In such tests, a solid piston or a hollow piston
with suitable guides shall be used. When using this latter modification, it is essential that the heat loss along the
piston, which is generally longer than usual, does not alter the test temperature of the material.
Removable Load
Insulation
Upperreferencemark
Control
thermometer
insulation
Lowerreferencemark
Cylinder
Die
Die-retaining
\ Insulating plate
plate
Figure 1 -Typical apparatus for determining melt flow rate (showing one of the possible methods of retaining
the die and one type of piston)
3.1.4 Temperature-control system.
For all cylinder temperatures that can be set, the temperature control shall be such that between the die and the
permissible filling height of the barrel, the temperature differences measured at the wall do not exceed those given
in table 1 throughout the duration of the test.
NOTE - The wall temperature may be measured with thermocouples of Pt thermometers embedded in the wall. If the
apparatus is not equipped in this way, the temperature is measured in the melt at a certain distance from the wall, depending
on the type of thermometer used.
The temperature-control system shall allow the test temperature to be set in steps of 1 “C or less.
3

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Table 1 - Maximum allowable variation in temperature with distance and with time
Test temperature, 8 Variation in temperature, “C
with distance
“C with time
+I
es200 + 0,5
200<9~300 + I,5 + I,0
+2
8>300 &I,5
3.15 Dies, made of tungsten carbide or hardened steel, 8,000 mm + 0,025 mm in length. The interior shall be
circular, straight and uniform in diameter such that in all positions it is within 0,005 mm of a true cylinder of nominal
diameter 2,095 mm.
The bore shall be hardened to a Vickers hardness of no less than 500 (HV 5 to HV 100) (see IS0 6507-I) and shall
have a surface roughness less than R, (arithmetic mean discrepancy) = 0,25 pm (see IS0 468). The die shall not
project beyond the base of the cylinder (see figure 1) and shall be mounted so that its bore is co-axial with the
cylinder bore.
3.1.6 Means of setting and maintaining the cylinder truly vertical
A two-directional bubble level, set normal to the cylinder axis, and adjustable supports for the apparatus are
suitable for the purpose.
NOTE - This is to avoid excessive friction caused by the piston or bending under heavy loads. A dummy piston will a spirit
level on its upper end is a suitable means of checking conformity with this requirement.
3.1.7 Removable load, on the top of this piston, which consists of a set of weights which may be adjusted so
that the combined mass of the load and the piston gives the selected nominal load to an accuracy of 0,5 %. An
alternative mechanical loading device may be used for higher loads.
3.2 Accessory equipment
3.2.1 General
3.2.1.1 Equipment for introducing test samples into the cylinder, consisting of a packing rod made of non-
abrasive material.
3.2.1.2 Cleaning equipment.
3.2.1.3 Mercury-in-glass thermometer (calibration thermometer) or another temperature-measuring device. This
measuring device shall be calibrated to permit temperature measurement to + 0,5 “C at the temperature and
immersion conditions to be used when calibrating the temperature-control system in accordance with 5.1.
3.2.2 For procedure A
3.2.2.1 Cutting tool, for cutting off extruded sample. A sharp-edged spatula has been found suitable.
3.2.2.2 Timer, accurate to + 0,l s.
3.2.2.3 Balance, accurate to + 0,5 mg.
3.2.3 For procedure B
Measurement equipment, for the automatic measurement of distance and time for the piston movement.

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4 Test sample
4.1 The test sample may be in any form that can be introduced into the bore of the cylinder, for example powder,
granules or strips of film.
NOTE - Some materials in powder form do not give a bubble-free filament if they are not previously compressed.
4.2 The test sample shall be conditioned and, if necessary, stabilized prior to the test, in accordance with the
material specifications.
5 Temperature calibration, cleaning and maintenance of the apparatus
5.1 Calibration of the temperature-control system
5.1.1 It is necessary to verify regularly the accuracy of the temperature-control system (3.1.4). For this purpose,
adjust the temperature-control system until the cylinder will remain at the required temperature as indicated by the
control thermometer. Preheat a calibration thermometer (3.2.1.3) to the same temperature. Then charge the
cylinder with a quantity of the material to be tested, or a material representative thereof (see 5.1.2), using the same
technique as for a test (see 6.2). Four minutes after completing the charging of the material, introduce the
calibration thermometer into the sample chamber and immerse it in the material therein until the tip of the bulb is
10 mm from the upper face of the die. After a further interval of not less than 4 min and not more than 10 min,
correct the temperature indicated by the control thermometer by algebraic addition of the difference between the
temperatures read on the two thermometers. It is also necessary to verify th
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