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  • BSI
    21/30427391 DC BS EN ISO 489. Plastics. Determination of refractive index
    Edition: 2021
    $44.66
    / user per year

Description of 21/30427391 DC 2021

This document 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.

  • 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.

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 can 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 8).



Standard Number21/30427391 DC
TitleBS EN ISO 489. Plastics. Determination of refractive index
StatusDefinitive
Publication Date2021-02-01
Identical National Standard OfISO/DIS 489
DescriptorsStandard deviation, Optical measurement, Plastics, Reproducibility, Specimen preparation, Test equipment, Precision, Refractive index, Testing conditions, Optical properties of materials, Plastics and rubber technology, Refractometry, Properties, Composition, Chemical composition
ICS83.080.01 Plastics in general
CommitteePRI/21
PublisherBSI
Pages17

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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