Thermoplastic composite materials have some advantages over thermoset resin based composites, such as fast processing, recyclability, reparability etc. In the present study commingled Carbon/Polyamide 12 (PA12) is analyzed as dry yarn and after heating the matrix fibers above the melting temperature and applying ambient pressure. The results are presented as micrographs. The mode I interlaminar fracture toughness of Carbon PA12 composite materials is measured, with and without introducing through-thickness yarns, and it is found to be very high even without 3D reinforcement. The consolidation time is also found to have great effect on the measured fracture toughness.