NEN ISO 489:1984被替代
Plastics - Determination Of The Refractive Index Of Transparent Plastics
出版：Nederlands Normalisatie Instituut
专家解读视频
Defines two methods for determining the refractive index of transparent plastics. Method A: Refractometric method for measuring the refractive index of transparent cast, moulded or sheet materials by means of a refractometer. The method is recommended when great accuracy is required. It is not applicable to powdered or granulated transparent materials. Method B: Immersion method (Becke line phenomenon) for determining the refractive index of powered or granulated transparent materials by means of a microscope and making use of the Becke line phenomenon.
ISO 489:1999 - Identical
