GB/T 6691-2007 "Resin Finishing Agent - Determination of Refractive Index" specifies the method for determining the refractive index of resin finishing agents, applicable to various types of resin finishing agents. Based on the principle of critical angle refraction, an Abbe refractometer is used to measure the refractive index at 20°C with sodium D-line light. The measurement is performed by adjusting the prism to align the light-dark boundary with the crosshair, reading the value, and taking the average of three measurements. The test requires an Abbe refractometer and a constant temperature water bath, and can assist in evaluating the content of non-volatile components.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active | ||
|---|---|---|---|
| CCS | G55 | ICS | 71.100.01;87.060.10 |
| Release Date | 2007-11-28 00:00:00 | Implementation Date | 2008-06-01 00:00:00 |
