|
ASTM
D1218 Standard Test Method for
Refractive Index and Refractive Dispersion of Hydrocarbon
Liquids |
|
The refractive index is measured using a
high-resolution refractometer of an optical-mechanical or
automatic digital type with the prism temperature accurately
controlled. The instrument principle is based on the critical
angle concept. |
|
ASTM D1747 Standard
Test Method for Refractive Index of Viscous Materials |
|
ASTM
D5006 Standard Test Method for
Measurement of Fuel System Icing Inhibitors (Ether Type) in
Aviation Fuels |
|
Measuring method :
Detection of critical angle of refractive Na-D line
(589.3nm) (Built-in
temperature control) |
