Thermal, thermo-mechanical and mechanical properties of four different commercially available polyetheretherketones (PEEK) based materials were investigated. PEEK matrix was either modified and/or reinforced with carbon fibres, graphite and/or PTFE. Impact strength was measured at three different temperatures: 25 ◦C, 100 ◦C, and 195 ◦C. At 25 ◦C, thermal stability and mechanical properties, including the elasti...