D1218-02 1.1 This test method
covers the measurement of refractive index, accurate to four decimal places or
better, of transparent and light-colored hydrocarbons in the range of 1.3300 to
1.5000 at temperatures from 20 to 30°C by manual (optical-mechanical) or
automatic (digital) procedure. 1.2 The manual
(optical-mechanical) procedure also covers the measurement of refractive
dispersion accurate to the fourth decimal place or better. Note 1—The test method
may be suitable for measuring the refractive indices of liquids above 1.5000 and
at temperatures both below 20°C and above 30°C; however, the test method
precision may not apply. Verification of the accuracy of such measurements will
depend upon the availability of reliable, certified reference standards that
demonstrate the performance of the instrument used under the particular
measuring conditions. 1.3 The test method may
not be applicable to liquids that are strongly colored, or that have bubble
points so near the test temperature that a reading cannot be obtained before
substantial weathering takes place. Liquid color should be limited to No. 4 ASTM
Color or lighter, as determined by Test Method D-1500.
Standard Test Method for
Refractive
Index and Refractive Dispersion of Hydrocarbon Liquids
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