Reference number
ISO 489:2022
© ISO 2025
International Standard
ISO 489:2022
Plastics — Determination of refractive index
Edition 3
2022-03
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Published (Edition 3, 2022)

ISO 489:2022

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Format
CHF 65
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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 2022-03
    Stage
    : International Standard published [60.60]
  • Edition
     : 3
    Number of pages
     : 12
  • Technical Committee :
    ISO/TC 61/SC 5
    ICS :
    83.080.01 
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