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<p>This International Standard specifies two test methods for determining the refractive index of plastics, namely:</p>
<p> Method A: a refractometric method for measuring the refractive index of moulded parts, cast or extruded sheet</p>
<p>or film, by means of a refractometer. It is applicable not only to isotropic transparent, translucent, coloured or</p>
<p>opaque materials but also to anisotropic materials. The method is recommended when great accuracy is</p>
<p>required. It is not applicable to powdered or granulated material.</p>
<p> Method B: an immersion method (making use of the Becke line phenomenon) for determining the refractive</p>
<p>index of powdered or granulated transparent materials by means of a microscope. Monochromatic light should,</p>
<p>in general, be used to avoid dispersion effects. The accuracy of this method is about the same as that of</p>
<p>method A. It is applicable to isotropic translucent, coloured materials but is not applicable to opaque materials</p>
<p>nor to anisotropic materials.</p>
<p>NOTE 1 The refractive index is a fundamental property which can be used for checking purity and composition, for the</p>
<p>identification of materials and for the design of optical parts. The change in refractive index with temperature may give an</p>
<p>indication of transition points of materials.</p>
<p>NOTE 2 The accuracy of method B is approximately the same as that of method A when an experienced operator uses the</p>
<p>method with extreme care (see clause 7).</p>
Reģistrācijas numurs (WIID)
1772
Darbības sfēra
<p>This International Standard specifies two test methods for determining the refractive index of plastics, namely:</p>
<p> Method A: a refractometric method for measuring the refractive index of moulded parts, cast or extruded sheet</p>
<p>or film, by means of a refractometer. It is applicable not only to isotropic transparent, translucent, coloured or</p>
<p>opaque materials but also to anisotropic materials. The method is recommended when great accuracy is</p>
<p>required. It is not applicable to powdered or granulated material.</p>
<p> Method B: an immersion method (making use of the Becke line phenomenon) for determining the refractive</p>
<p>index of powdered or granulated transparent materials by means of a microscope. Monochromatic light should,</p>
<p>in general, be used to avoid dispersion effects. The accuracy of this method is about the same as that of</p>
<p>method A. It is applicable to isotropic translucent, coloured materials but is not applicable to opaque materials</p>
<p>nor to anisotropic materials.</p>
<p>NOTE 1 The refractive index is a fundamental property which can be used for checking purity and composition, for the</p>
<p>identification of materials and for the design of optical parts. The change in refractive index with temperature may give an</p>
<p>indication of transition points of materials.</p>
<p>NOTE 2 The accuracy of method B is approximately the same as that of method A when an experienced operator uses the</p>
<p>method with extreme care (see clause 7).</p>
