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prEN ISO 489

Plastics - Determination of refractive index (ISO/DIS 489:2021)

Üldinfo
Kavand
Alusdokumendid
ISO/DIS 489; prEN ISO 489
Tegevusala (ICS grupid)
83.080.01 Plastid üldiselt
Direktiivid või määrused
puuduvad
Standardi ajalugu
Staatus
Kuupäev
Tüüp
Nimetus
Põhitekst
01.09.2003
Põhitekst
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).
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