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ISO 489:2022

Current Revision

Plastics - Determination of refractive index

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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.


SDO ISO: International Organization for Standardization
Document Number ISO 489
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 61/SC 5
Publish Date Document Id Type View
Not Available ISO 489:2022 Revision