Polarity Index
Burdick & Jackson solvents are arranged in order of increasing polarity index, a relative measure of the degree of interaction of the solvent with various polar test solutes.

 
  Polarity Index (P)
Pentane 0.0
1,1,2-Trichlorotrifluoroethane 0.0
Cyclopentane 0.1
Heptane 0.1
Hexane 0.1
   
Iso-Octane 0.1
Petroleum Ether 0.1
Cyclohexane 0.2
n-Butyl Chloride 1.0
   
Toluene 2.4
Methyl t-Butyl Ether 2.5
o-Xylene 2.5
Chlorobenzene 2.7
o-Dichlorobenzene 2.7
   
Ethyl Ether 2.8
Dichloromethane 3.1
Ethylene Dichloride 3.5
n-Butyl Alcohol 3.9
Isopropyl Alcohol 3.9
   
n-Butyl Acetate 4.0
Isobutyl Alcohol 4.0
Methyl Isoamyl Ketone 4.0
n-Propyl Alcohol 4.0
Tetrahydrofuran 4.0
   
Chloroform 4.1
Methyl Isobutyl Ketone 4.2
Ethyl Acetate 4.4
Methyl n-Propyl Ketone 4.5
Methyl Ethyl Ketone 4.7
   
1,4-Dioxane 4.8
Acetone 5.1
Methanol 5.1
Pyridine 5.3
2-Methoxyethanol 5.5
   
Acetonitrile 5.8
Propylene Carbonate 6.1
N,N-Dimethylformamide 6.4
Dimethyl Acetamide 6.5
N-Methylpyrrolidone 6.7
   
Dimethyl Sulfoxide 7.2
Water 10.2
Not included:
 

    Ethyl Alcohol
    Glyme
    Isopropyl Myristate
    1,2,4-Trichlorobenzene
    Triethylamine
    Trifluoroacetic Acid