Table 4.

Loss tangents (tan δ) of various solvents (2.45 GHz, 20 °C).

High microwave-absorbing (tan δ > 0.5)		Medium microwave-absorbing (0.1 < tan δ < 0.5)		Low microwave-absorbing (tan δ < 0.1)
Solvent	tan δ	Solvent	tan δ	Solvent	tan δ
Ethylene glycol	1.35	2-butanol	0.447	Chloroform	0.091
Ethanol	0.941	1,2-dichlorobenzene	0.28	Acetonitrile	0.062
Dimethyl sulfoxide	0.825	1-methyl-2-pyrrolidone	0.275	Ethyl acetate	0.059
2-propanol	0.799	Acetic acid	0.174	Acetone	0.054
Formic acid	0.722	N,N'-dimethylformamide	0.161	Tetrahydrofuran	0.047
Methanol	0.659	1,2-dichloroethane	0.127	Dichloromethane	0.042
Nitrobenzene	0.589	Water	0.123	Toluene	0.04
1-butanol	0.571	Chlorobenzene	0.101	Hexane	0.02

Reproduced with permission from [82].