EN ISO 2039-2:1999

Plastics - Determination of hardness - Part 2: Rockwell hardness (ISO 2039-2:1987)

Specifications of a method for the determination of the indentation hardness of plastics by means of the Rockwell hardness tester using the Rockwell M, L and R hardness scales. The Rockwell hardness number is derived from the net increase in depth of impression as the load on an indentor is increased from a fixed minor load to a major load and then returned to the same minor load. For materials having high creep and recovery, the time-factors involved in application of the major and minor loads have a considerable effect on the results of the measurements.

Kunststoffe - Bestimmung der Härte - Teil 2: Rockwellhärte (ISO 2039-2:1987)

1.1 Dieser Teil von ISO 2039 legt ein Verfahren zur Bestimmung der Eindruckhärte von Kunststoffen mit einer Rockwellhärteprüfmaschine unter Verwendung der Rockwellhärteskalen M, L und R fest. 1.2 Der Rockwellhärtewert steht in direktem Zusammenhang mit der Eindruckhärte eines Kunststoffes; je größer der Rockwellhärtewert desto härter der Kunststoff.

Plastiques - Détermination de la dureté - Partie 2: Dureté Rockwell (ISO 2039-2:1987)

Polimerni materiali - Določanje trdote - 2. del: Trdota po Rockwellu (ISO 2039-2:1987)

General Information

• Status: Published
• Publication Date: 22-Jun-1999
• Withdrawal Date: 30-Dec-1999
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 23-Jun-1999
• Due Date: 23-Jun-1999
• Completion Date: 23-Jun-1999
• Ref Project: SIST EN ISO 2039-2:2000 - Plastics - Determination of hardness - Part 2: Rockwell hardness (ISO 2039-2:1987)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2000
3ROLPHUQLPDWHULDOL'RORþDQMHWUGRWHGHO7UGRWDSR5RFNZHOOX,62

Plastics - Determination of hardness - Part 2: Rockwell hardness (ISO 2039-2:1987)
Kunststoffe - Bestimmung der Härte - Teil 2: Rockwellhärte (ISO 2039-2:1987)
Plastiques - Détermination de la dureté - Partie 2: Dureté Rockwell (ISO 2039-2:1987)
Ta slovenski standard je istoveten z: EN ISO 2039-2:1999
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

IS0
INTERNATIONAL STANDARD
2039-2
Second edition
1987-07-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
_ ME~YHAPO~HAR OPTAHM3A~MR I-IO CTAHJJAPTM3A~MM
Plastics - Determination of hardness -
Part 2:
Rockwell hardness
Plastiques - Determination de la duret6 -
Partl ’e 2: Duretb Rockwell
Reference number
IS0 2039-2: 1987 (E)
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 % approval by the member bodies voting.
International Standard IS0 2039-Z was prepared by Technical Committee ISO/TC 61,
Plastics.
This second ed ition cancels and replaces the first edition (IS0 2039-z : 1981), of which
it constitutes a minor 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 othewise stated.
0 International Organization for Standardization, 1987
Printed in Switzerland
IS0 2039-2 : 1987 (E)
INTERNATIONALSTANDARD
Plastics - Determination of hardness -
Part 2:
Rockwell hardness -
and then followed by a return to the same minor load, all at
I Scope and field of application
specified limits for times of loading. The actual measurement is
based on the total depth of penetration, minus the elastic
1 .I This part of IS0 2039 specifies a method for determining
recovery after a fixed time following removal of the major load,
the indentation hardness of plastics by means of the Rockwell
minus the penetration resulting from the minor load. The
hardness tester using the Rockwell M, L and R hardness scales.
Rockwell hardness number is derived from the net increase in
depth of impression as the load on an indentor is increased
1.2 A Rockwell hardness number is directly related to the in-
from a fixed minor load to a major load and then returned to the
dentation hardness of a plastic material; the higher the
same minor load.
Rockwell hardness number, the harder the material. Due to a
short overlap of Rockwell hardness scales by this procedure,
3.2 Each Rockwell hardness scale division represents
two different Rockwell hardness numbers of different scales
0,002 mm vertical movement of the indentor. In practice, the
may be obtained on the same material, both of which may be
Rockwell hardness number is derived from the following
technically correct.
relationship :
1.3 For materials having high creep and recovery, the time-
HR = 130 - e
factors involved in application of the major and minor loads
have a considerable effect on the results of the measurements.
where
HR is the Rockwell hardness number;
1.4 An alternative method of using the apparatus to give
hardness on the Rockwell-cc hardness scale is specified in the
e is the depth of impression after removal of the major
annex which shows how this scale may be related to the hard-
load, in units of 0,002 mm.
ness measurement of IS0 2039-l.
NOTE - This relationship only holds for the E, M, L and R scales.
2 References
4 Apparatus
I SO 48, Rubber, vulcanized - Determination of hardness
(Hardness between 10 and 100 IRHD). 1)
4.1 The apparatus is a standard Rockwell hardness tester
Standard atmospheres for conditioning
IS0 291, Plastics -
which comprises essentially
and testing.
-
a rigid frame supporting an adjustable platform fitted
Determination of indentation hardness by
IS0 868, Plastics -
with a plate at least 50 mm in diameter to support the test
means of a durometer (Shore hardness).
specimen;
IS0 2039-1, Plastics - Determination of hardness - Part I:
-
an indentor with its associated fittings;
Ball indentation method.
-
a device for applying the appropriate loads to the
indentor without impact.
3 Principle
4.2 The indentor comprises a polished hardened steel ball
3.1 This is a method for determining hardness in which a which rolls freely in its housing. The ball shall not deform dur-
ing the test or show damage after a test. The diameter of the in-
constant minor load is applied to a steel ball resting on the
material to be tested, followed by application of a major load, dentor depends upon the Rockwell scale in use (see 4.5).
1) At present at the stage of draft. (Revision of IS0 48: 1979, IS0 1400: 1975 and IS0 1818: 1975.)
IS0 2039-2 : 1987 (E)
checks may be made at frequent intervals using blocks
4.3 The indentor is equipped with a dial gauge or other suitable
device to measure the depth of penetration of the indentor to calibrated for use when the machine is set up in the R, L or M
within 0,001 mm. It is desirable but not essential for the dial test modes.
gauge to be calibrated in Rockwell hardness numbers (one
Rockwell scale division = 0,002 mm). When the machine is so
directly calibrated, it is usual for the dial gauge to have a black
5 Test specimen
and a red scale, the latter allowing automatically for the constant
of 130 in the derivation of Rockwell hardness number on the M, L
5.1 The standard test specimen shall be a flat sheet at least
and R scales (see 3.2). Alternative means of measurement of
6 mm thick. It shall be of a suitable area to meet the re-
penetration and display of data may be used, provided that the
quirements of 7.4. The test specimen does not necessarily have
accuracy is at least equal to that of the dial gauge.
to be square. It shall not show any evidence of imprint by the
indentor on the supported surface after a test.
The appropriate loads for the M, L and R scales are as
4.4
given in 4.5. In each case the minor load is 98,07 N. Provision is 5.2 When specimens of the minimum thickness specified in
usually made in the Rockwell machine to apply the minor load 5.1 are not available, the test specimen shall be made up of a
pile of thinner test specimens of the same thickness and the
to the specimen by means of a screw capstan which raises the
same material, provided that the surfaces of the individual
platform supporting the test specimen until the latter contacts
the indentor. In these circumstances the dial gauge has an in- pieces are in total contact and not held apart by any form of
dicated point to show when the minor load has been fully ap- surface imperfections (as, for example, sink marks or burrs
from saw cuts).
plied; reference should be made to the manufacturer ’s hand-
book before operating the machine. The adjustment of speed
of load-application is of great importance. Adjust the dash-pot
5.3 All indentations shall be made on one surface only of the
on the Rockwell tester so that the operating handle completes
test specimen.
its travel in 4 to 5 s with no specimen on the machine or no load
applied by the indentor to the anvil. The major load shall be
5.4 One test specimen is sufficient for the determination of
980,7 N for this calibration.
Rockwell hardness and at least five measurements shall be
made on each test specimen of isot
...