ASTM D1747 Refractive Index of Viscous Materials
When light passes from air into a transparent liquid, the light bends, often giving the liquid a characteristic appearance. This test determines the refractive index (amount that the light bends entering the sample) of viscous liquids. It is appropriate for samples with no suspended particles at the test temperature, and may be used for both quality control and research applications. One example of its usefulness is in ethylene glycol/water hydraulic fluids, where the proper water level is essential for the fluids to provide optimal protection. Refractive index is a quick and dependable method to determine the quantity of water present in the fluid. The sample is placed in the prism box of a refractometer and brought to the test temperature. The angle at which light passes through the sample is determined, compared to a known standard and reported as a unitless number. Please specify the desired temperature.
Instructions:
Needs temperature: 20°C or 25°C