Isothermal vaporliquid equilibrium data for binary systems comprising perfluorobutane (R610) with methane (CH4) or hydrogen sulfide (H2S) were measured at isothermal conditions of approximately (293, 313, and 333) K, and pressures up to 9.837 MPa. The data were measured using a static-analytic apparatus equipped with a mobile pneumatic capillary sampler. The experimental data were correlated via the direct method using two sets of thermodynamic models. The PengRobinson equation of state incorporating the MathiasCopeman alpha function, with the WongSandler mixing rule utilizing the nonrandom two-liquid activity coefficient model, was used for the correlation of the CH4 + C4F10 system, while the SoaveRedlichKwong equation of state incorporating the Mathias-Copeman alpha function, with the modified HuronVidal first-order mixing rule utilizing the nonrandom two-liquid activity coefficient model was used for the H2S + C4F10 system.