ISO 489:1999 塑料-塑料折光指数的测定.

标准编号：ISO 489:1999

中文名称：塑料-塑料折光指数的测定.

英文名称：Plastics — Determination of refractive index

发布日期：1999-04

标准范围

本国际标准规定了两种测定塑料折射率的试验方法，即:方法A:测量模制零件、铸造或挤压板材折射率的折射率法或胶片，通过折射计。它不仅适用于各向同性透明、半透明、彩色或彩色不透明材料也适用于各向异性材料。当需要高精度时，建议使用该方法必修的。不适用于粉状或颗粒状材料。方法B:浸没法（利用贝克线现象）测定折射率用显微镜测量粉末状或颗粒状透明材料的指数。单色光应该，通常情况下，应使用该方法来避免分散效应。这种方法的准确度与传统方法大致相同方法A.适用于各向同性半透明有色材料，但不适用于不透明材料也不适用于各向异性材料。注1:折射率是一个基本属性，可用于检查纯度和成分，例如材料鉴定和光学零件设计。折射率随温度的变化可能会导致指示材料的过渡点。注2:当有经验的操作员使用方法时要格外小心（见第7条）。

This International Standard 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 sheetor film, by means of a refractometer. It is applicable not only to isotropic transparent, translucent, coloured oropaque materials but also to anisotropic materials. The method is recommended when great accuracy isrequired. It is not applicable to powdered or granulated material.Method B: an immersion method (making use of the Becke line phenomenon) for determining the refractiveindex of powdered or granulated transparent materials by means of a microscope. Monochromatic light should,in general, be used to avoid dispersion effects. The accuracy of this method is about the same as that ofmethod A. It is applicable to isotropic translucent, coloured materials but is not applicable to opaque materialsnor to anisotropic materials.NOTE 1 The refractive index is a fundamental property which can be used for checking purity and composition, for theidentification of materials and for the design of optical parts. The change in refractive index with temperature may give anindication 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 themethod with extreme care (see clause 7).

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