The Wankel machine was proposed in the mid twentieth century. While it has found much use as an engine and air compressor, it has not been adopted as a refrigerant vapor compressor. One reason is typically the disadvantageous ratio of the swept volume to the leakage path. Therefore, a new oil-free sealing system was proposed, in which the compression pressure pushes sealing lips against the side wall of the pressure chamber. To determine the sealing performance in oil free conditions, an experimental setup for testing tribological sealing pairings under a gas atmosphere at pressures of up to 10 bar was developed. A pressure chamber allowing oscillating movement through an outer shaft was constructed and mounted on an oscillating tribometer. Selected material concepts were qualitatively and quantitatively assessed. Detailed material analyses of the samples were performed with the focus on the changes due to tribological interactions. The compressor was designed to consist of only few parts to demonstrate good manufacturability. This paper shows the first data collected of a new Wankel compressor with R1234ze(E) as the refrigerant. Mass flow rate, power consumption, temperature profiles, volumetric and isentropic efficiency are presented as a function of time.