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EVS-EN ISO 489:2022

Plastics - Determination of refractive index (ISO 489:2022)

General information
Valid from 01.04.2022
Base Documents
ISO 489:2022; EN ISO 489:2022
Directives or regulations
None
Standard history
Status
Date
Type
Name
01.04.2022
Main
01.09.2003
Main
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, in general, is used to avoid dispersion effects. 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.
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