NF EN ISO 489
Plastics. Determination of refractive index.
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).
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).
<p>This document specifies two test methods for determining the refractive index of plastics, namely:</p> <p>— 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.</p> <p>— 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, in general, is used to avoid dispersion effects.</p> <p>NOTE 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 can give an indication of transition points of materials.</p>
-
1 Domaine d'application1
-
2 Références normatives1
-
3 Appareillage et produits2
-
3.1 Méthode A2
-
3.2 Méthode B3
-
4 Préparation des éprouvettes3
-
4.1 Méthode A3
-
4.2 Méthode B4
-
4.3 Quantité requise d'éprouvettes ou de mesures4
-
5 Conditionnement4
-
6 Mode opératoire4
-
6.1 Méthode A4
-
6.2 Méthode B9
-
7 Fidélité10
-
8 Rapport d'essai11
COBAZ is the simple and effective solution to meet the normative needs related to your activity, in France and abroad.
Available by subscription, CObaz is THE modular solution to compose according to your needs today and tomorrow. Quickly discover CObaz!
Request your free, no-obligation live demo
I discover COBAZ