Yellow paraffin wax or coarser wax still contains small amounts of non-hydrocarbon components. Although these complex organic compounds of sulfur, nitrogen and oxygen contain only small amounts, the stability of paraffin wax is greatly reduced. Some ring-fused aromatic hydrocarbons in a small amount of aromatic compounds contained in paraffin are harmful to the human body, so ring-fused aromatic hydrocarbons such as paraffin used in food industry and medicine should be reduced below the index specified before that. It can be used.

In laboratory analysis of some paraffins, mass spectrometer data on the chemical composition of each fraction divided by the number of carbon atoms in the molecule show that the fractions with the fewest carbon atoms in the molecule are all normal alkanes and their number. . the number of carbon atoms increases, the concentration of isoparaffins and cycloalkanes increases, and the aromatic compounds present in the waxes only as carbon-containing fractions. Therefore, when the refining conditions are the same, in ordinary commercial paraffin wax, the molten ring aromatic hydrocarbon content in the low-grade wax is less than in the high-grade wax.