ISO 489:2022 PDF

Scope: 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 Referenced Document

2022 ISO 489:2022 Plastics — Determination of refractive index
1999 ISO 489:1999 Plastics - Determination of refractive index
1983 ISO 489:1983 Plastics; Determination of the refractive index of transparent plastics

$Plastics — Determination of refractive index$