ISO 1874-2:1987
(Main)Plastics — Polyamide (PA) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of properties
Plastics — Polyamide (PA) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of properties
Plastiques — Matériaux polyamides (PA) pour moulage et extrusion — Partie 2: Préparation des éprouvettes et détermination des propriétés
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IS0
INTERNATIONAL STANDARD
1874-2
First edition
1987- 12- 15
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INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXAYHAPOAHAR OPTAHMBAUMR il0 CTAHAAPTMBAUMM
Plastics - Polyamide (PA) homopolymers for
moulding and extrusion -
Part 2:
Preparation of test specimens and determination of
properties
Plastiques - Homopolymères polyamides (PA) pour moulage et extrusion -
Partie 2: Préparâtion des éprouvettes et détermination des caractéristiques
Refe :ne number
IS0 1874-2: 1987 (El
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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 YO approval by the member bodies voting.
International Standard IS0 1874-2 was prepared by Technical Committee ISO/TC 61,
Plastics.
Together with IS0 1874-1 : 1985 it cancels and replaces IS0 Recommendation
R 1874 : 1971, of which the two parts of IS0 1874 constitute a technical revision.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
O International Organization for Standardization, 1987
Printed in Switzerland
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INTERNATIONAL STANDARD IS0 1874-2 : 1987 (E)
Plastics - Polyamide (PA) homopolymers for
mouîding and extrusion -
Part 2:
Preparation of test specimens and determination of
properties
IS0 180, Plastics - Determination of hod impact strength of
1 Scope and field of application
rigid materials.
This part of IS0 1874 specifies methods for the preparation of
IS0 291, Plastics - Standard atmospheres for conditioning
test specimens and the determination of characteristic proper-
and testing.
ties of polyamide materials, including those properties used for
designation purposes as described in IS0 1874-1.
IS0 294, Plastics - Injection moulding test specimens of ther-
moplastic materials.
Fixed test conditions are essential to allow direct comparison of
results. Therefore, in specifications and agreements between IS0 307, Plastics - Polyamides - Determination of viscosity
interested parties, reference should be made to the methods number.
specified in this part of IS0 1874.
IS0 527, Plastics - Determination of tensile properties. 1 )
The properties of articles produced from polyamide materials
IS0 537, Plastics - Testing with the torsion pendulum.
by the nature of the moulding compound, the
are governed
design and gating of the mould and the state of the moulding
IS0 599, Plastics - Polyamide homopolymers - Determina-
resulting from processing and post-treatment conditions.
tion of matter extractable by boiling methanol.
Therefore, the results of tests carried out by the methods in this
part of IS0 1874 are valid only for the specified test specimens
IS0 899, Plastics - Determination of tensile creep.
and not for articles of other shapes or for specimens of other
IS0 960, Plastics - Polyamides - Determination of water
dimensions and/or that are produced under other conditions.
content. 1)
IS0 11 10, Plastics - Polyamides - Accelerated conditioning
2 References of test specimens. 1)
IS0 11û3, Plastics - Methods for determining the density and
IS0 75, Plastics and ebonite - Determination of temperature
relative density (specific gravity) of plastics excluding cellular
of deflection under load.
plastics.
IS0 175, Plastics - Determination of the effects of liquid
IS0 1874-1, Plastics - Polyamide (PA) homopolymers for
chemicals, including water.
moulding and extrusion - Part 7: Designation.
IS0 178, Plastics - Determination of flexuralproperties of rigid
IS0 2039-1, Plastics - Determination of hardness - Part 1:
plastics.
Ball indentation method.
IS0 179, Plastics - Determination of Charpy impact strength
IS0 2039-2, Plastics - Determination of hardness - Part 2:
of rigid materials.
Rockwell hardness.
1) At present at the stage of draft.
1
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IS0 1874-2 : 1987 (E)
IS0 3146, Plastics - Determination of melting behaviour
Clamping force 350 kN
(melting temperature or melting range) of semi-crystalline
Screw diameter D
about 30 mm
polymers.
Screw length about 18 D
IS0 3451-4, Plastics - Determination of ash - Part 4:
Depth of flights 5,5 to 3,O mm
Polyamides.
Ratio of stroke volume to shot
volume (see IS0 294) not greater than 6:l
IEC Publication 93, Methods of test for volume resistivity and
surface resistivity of solid electrical insulating materials.
The residence time shall not exceed 15 min.
IEC Publication 112, Method for determining the comparative
and the proof tracking indices of solid insulating materials
In order to avoid uptake of moisture, the feed hopper should be
under moist conditions.
closed by suitable means and contact between the granules
and the open air should be less than 30 min.
IEC Publication 243, Recommended methods of test for electric
strength of solid insulating materials at power frequencies.
IEC Publication 250, Recommended methods for the deter-
3.3 Processing temperatures
mination of the permittivity and dielectric dissipation factor of
electrical insulating materials at power, audio and radio fre-
Whenever possible, the plastic melt temperature (see IS0 294)
quencies including metre wavelengths.
shall be chosen from those recommended in table 1.
3 Preparation of test specimens
Table 1
Plastic
Test specimens shall be prepared by injection moulding,
Viscosity Glass
melt
observing the general instructions given in IS0 294 and the Polymer number11 content
temperature
specific instructions and recommendations given below in 3.1
mllg % OC
to 3.4.
PA 6
130 to 160 O 250
200 to 240 O 270
130 to 160 < 30 2802)
Treatment of the moulding material
3.1
130 to 160 30 to 50 290
The test specimens shall be prepared from granules containing
PA 66 130 to 160 O 280
not more than 0,2 % moisture in the case of moulding material
160 to 200 O 290
with a viscosity number up to 200, and not more than 0,l %
130 to 160 10 to 50
290
moisture in the case of moulding material with a viscosity
PA 69, PA 610 130 to 160 O 270
number greater than 200.
PA 612 160 to 200 O 270
For this reason, the granules shall be kept in moisture-proof
PA 11, PA 12 110 to 150 O 210
containers until they are required for use. Before they are pro-
150 to 200 O
cessed, they shall have attained room temperature. 230
200 to 240 O 250
110 to 130 30 to 50
230
The water content of filled and reinforced materials shall always
130 to 240 10 to 20 250
refer to the matrix.
130 to 240 > 20 to 50
260
If the moisture content of the granules exceeds the appropriate
P
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