A melt blending method was used to blend poly(ethylene terephthalate) (PET) and poly(phenylene sulfide) (PPS) with a twin screw extruder to provide basic data for the production of PPS/PET sheath-core type bicomponent fibers. Differential scanning calorimetry showed that the melting ($T_m$) and glass transition temperature ($T_g$) of PPS in the PPS/PET blends were unaffected by the addition of PET, even up to 20 wt%. However, PET addition resulted in a decrease in the cold crystallization temperature ($T_{cc}$) of PPS and an increase in the melt crystallization temperature ($T_{mc}$) of PPS. SEM images of the fracture surface of the PPS/PET blends with various compositions showed that the PET appeared as spherical particles in the blends. This shows that PPS/PET is an immiscible blend system. The addition of up to 20 wt% PET did not affect the mechanical properties of the resulting PPS/PET films. The tensile strength retention of the blend films immersed in an aqueous solution containing either 30% NaOH, 10% HCl or 10% $HNO_3$ at $93^{circ}C$ for one week was unaffected by PET blending.