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Homepage>BS Standards>83 RUBBER AND PLASTICS INDUSTRIES>83.080 Plastics>83.080.01 Plastics in general>21/30427391 DC BS EN ISO 489. Plastics. Determination of refractive index
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21/30427391 DC BS EN ISO 489. Plastics. Determination of refractive index

21/30427391 DC

BS EN ISO 489. Plastics. Determination of refractive index

CURRENCY
29.76 USD
Standard number:21/30427391 DC
Pages:17
Released:2021-02-01
Status:Draft for Comment
DESCRIPTION

21/30427391 DC


This standard 21/30427391 DC BS EN ISO 489. Plastics. Determination of refractive index is classified in these ICS categories:
  • 83.080.01 Plastics in general

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 should, in general, be used to avoid dispersion effects.

NOTE 1

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.

NOTE 2

The accuracy of method B is approximately the same as that of method A when an experienced operator uses the method with extreme care (see Clause 8).