Experimental vapor pressures were developed for alkylsulfides (di-butylsulfide, di-sec-butylsulfide, di-hexylsulfide, di-octylsulnde, di-tert-butylmethylsulfide) and arylsulfides (ethylphenylsulfide, di-phenylsulfide, di-benzylsulfide, benzylphenylsulfide) from 1 Pa to 63 kPa. The vapor pressures of these compounds were also calculated using a Peng-Robinson-type equation of state. Each component was characterized by three parameters: the normal boiling temperature, the pseudocovolume and the shape parameter which are calculated by a Bondi-like group contribution method. The proposed approach yield to a good representation of the vapor pressures of the different compounds. (C) 2004 Elsevier B.V. All rights reserved.