Plastics - Determination of refractive index (ISO 489:1999)

This International Standard specifies two test methods for determining the refractive index of plastics, namely:
Method A: a refractometric method for measuring the refractive index of moulded parts, cast or extruded sheet
or film, by means of a refractometer. It is applicable not only to isotropic transparent, translucent, coloured or
opaque materials but also to anisotropic materials. The method is recommended when great accuracy is
required. It is not applicable to powdered or granulated material.
Method B: an immersion method (making use of the Becke line phenomenon) for determining the refractive
index of powdered or granulated transparent materials by means of a microscope. Monochromatic light should,
in general, be used to avoid dispersion effects. The accuracy of this method is about the same as that of
method A. It is applicable to isotropic translucent, coloured materials but is not applicable to opaque materials
nor to anisotropic materials.
NOTE 1 The refractive index is a fundamental property which can be used for checking purity and composition, for the
identification of materials and for the design of optical parts. The change in refractive index with temperature may give an
indication of transition points of materials.
NOTE 2 The accuracy of method B is approximately the same as that of method A when an experienced operator uses the
method with extreme care (see clause 7).

Kunststoffe - Bestimmung des Brechungsindex (ISO 489:1999)

Diese Internationale Norm beschreibt zwei Verfahren zur Bestimmung des Brechnungsindex von Kunststoffen: Verfahren A: Verfahren zur Messung des Brechungsindex von Formteilen, gegossenen oder stranggepreßten Tafeln oder Folien mit einem Refraktometer. Dieses Verfahren gilt nicht nur für isotrope durchsichtige, durchscheinende, gefärbte oder undurchsichtige, sondern auch für anisotrope Materialien. Das Verfahren wird empfohlen, wenn hohe Anforderungen an die Meßgenauigkeit gestellt werden. Es gilt nicht für pulverförmiges oder granuliertes Material.

Plastiques - Détermination de l'indice de réfraction (ISO 489:1999)

La présente Norme internationale spécifie deux méthodes d'essai visant à déterminer l'indice de réfraction des
plastiques, à savoir :
Méthode A : méthode réfractométrique destinée à mesurer l'indice de réfraction des pièces moulées, se
présentant sous forme de feuilles ou de films coulés ou extrudés, au moyen d'un réfractomètre. Elle s'applique
non seulement aux matériaux isotropes opaques, colorés, translucides ou transparents, mais aussi aux
matériaux anisotropes. Cette méthode est recommandée lorsqu'une grande précision est nécessaire. Elle n'est
pas applicable au plastique en poudre ou en granulés.
Méthode B : méthode d'immersion (utilisation du phénomène de la ligne de Becke) destinée à déterminer
l'indice de réfraction de matériaux transparents en poudre ou en granulés à l'aide d'un microscope. Il convient
en général d'utiliser la lumière monochromatique pour éviter les effets de dispersion. La précision de cette
méthode est approximativement la même que celle de la méthode A. Elle s'applique aux matériaux isotropes
translucides ou colorés, mais elle n'est pas applicable aux matériaux opaques ni aux matériaux anisotropes.
NOTE 1 L'indice de réfraction est une propriété fondamentale qui peut être utilisée pour contrôler la pureté et la composition
des matières, pour leur identification et pour la conception de pièces d'optique. La variation de l'indice de réfraction suivant la
température peut donner une idée du point de transition des matières.
NOTE 2 La précision de la méthode B est pratiquement identique à celle de la méthode A si l'opérateur expérimenté utilise
la méthode avec un soin extrême (voir l'article 7).

Polimerni materiali - Določanje lomnega količnika (ISO 489:1999)

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Standards Content (Sample)

SIST EN ISO 4651:2000
Cellular rubbers and plastics - Determination of dynamic cushioning performance (ISO
Schaumstoffe aus Kautschuk und Kunststoffen - Bestimmung der Stoßabsorption (ISO
Caoutchoucs et plastiques alvéolaires - Détermination de la capacité d'amortissement
dynamique (ISO 4651:1988)
Ta slovenski standard je istoveten z: EN ISO 4651:1995
83.100 Penjeni polimeri Cellular materials
SIST EN ISO 4651:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 4651:2000

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SIST EN ISO 4651:2000

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SIST EN ISO 4651:2000

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SIST EN ISO 4651:2000

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SIST EN ISO 4651:2000

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SIST EN ISO 4651:2000
Second edition
Cellular rubbers and plastics - Determination of
dynamic cushioning Performance
Determination de Ia capacife d’amortissemen t
Caoutchoucs et plastiques aMo/aires -
Reference number
ISO 4651 : 1988 (E)

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SIST EN ISO 4651:2000
ISO 4651 : 1988 (El
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, govern-
mental 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 approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 4651 was prepared by Technical Committee ISO/TC 45,
Rubber and rubber products.
This second edition cancels and replaces the first edition (ISO 4651 : 1979), sub-clauses
3.1, 7.1, 7.2.1, 7.2.2, 8.2 and 9.2 of which have been technically revised.
Annex A of this International Standard is for information only.
0 International Organkation for Standardkation, 1988
Printed in Switzerland

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SIST EN ISO 4651:2000
ISO 4651 : 1988 (El
Cellular rubbers and plastics - Determination of
dynamic cushioning Performance
3.2 peak deceleration, a: The maximum deceleration of the
1 Scope
drop hammer during the impact on the test piece. In the Inter-
national System of Units (SI), this is expressed in metres per
This International Standard specifies the procedure for deter-
second per second (m/s*).
mining the dynamic cushioning Performance of cellular rubber
materials and rigid and flexible cellular plastics, by measuring
the peak deceleration of a mass when it is dropped on a test
3.3 displacement curve : The curve describing the displace-
piece. The test described is intended primarily for quality
ment of the impacted surface of the test piece as a function of
assurance; in addition, however, since this type of test is also
time during the impact. (See annex A.)
used to obtain design data, notes are given in annex A to assist
in the latter respect.
3.4 dynamic stress: The decelerating forte exerted by the
The method is applicable solely to materials used in packaging.
material upon the drop hammer divided by the original area of
the test piece.
2 Normative references
3.5 deceleration forte: The mass of the drop hammer
The following Standards contain provisions which, through
multiplied by its instantaneous deceleration.
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
3.6 strain: Displacement expressed as a percentage of the
agreements based on this International Standard are encouraged
original thickness.
to investigate the possibility of applying the most recent
editions of the Standards listed below. Members of IEC a

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