Impurities
Chemical analysis and testing
Solvent extraction methods
Refractive index
Solvents
Relative density
Iodometry
Aqueous extraction methods
Phosphates
Acidity
Volumetric analysis
Thermal testing
Tolyl compounds
Phenols
Acidimetry
Heating tests
Industrial
Thermal stability
Chromaticity
Determination of content
Plasticizers
Colour