NEN EN ISO 489 : 1999

1 Scope
2 Normative references
3 Apparatus and materials
      3.1 Method A
      3.2 Method B
4 Preparation of test specimens
      4.1 Method A
      4.2 Method B
      4.3 Required number of specimens or measurements
5 Conditioning
6 Procedure
      6.1 Method A
      6.2 Method B
7 Precision
8 Test report

Defines 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. - 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.