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Norm

ISO 489:2022

Issue date: 2022 03 04

Plastics — Determination of refractive index

This document specifies two test methods for determining the refractive index of plastics, namely: —    Method A: a refractometric method for measuring the refractive ind...
Valid
Publisher:
International Organization for Standardization
Format:
Digital | 12 Pages
Language:
English

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.

ISO 489:2022
2022 03 04
Plastics — Determination of refractive index
Norm
ISO 489:1999
1999 04 22
Plastics — Determination of refractive index
Norm
ISO 489:1983
1983 12 01
Plastics — Determination of the refractive index of transparent plastics
Norm