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This dataset contains source data obtained during research under the project OPUS-26 2023/51/B/ST8/00775 "Development of a new approach to the production and compatibility of polyester blends using hybrid organic–inorganic additives", relating to research results described in the publication "The Use of the Overmolding Technique for the Preparation of Basalt Fiber (BF)-Based Composite, the Comparative Study of Poly(ethylene terephthalate)/Polycarbonate-PET/PC and Poly(butylene terephthalate)-PBT/PC Blends ", DOI: 10.3390/polym18010054 As part of the research work carried out, measurements were carried out using the following methods: differential scanning calorimetry DSC/ abbreviation: DSC dynamic mechanical thermal analysis/ abbreviation: DMTA mechanical properties evaluation: MECH Interlaminar shear strength, ILSS The thermal properties and phase region changes were investigated using the differential scanning calorimetry method (DSC). The small 5 mg specimens were placed inside the pierced aluminum crucibles. The heating/cooling rate was set to 10 °C/min, while the scanning range was set to 20–300 °C. The standard heating/cooling/heating procedure was applied. The oven chamber was purged with a protective nitrogen atmosphere, flow rate 20 mL/min. The thermomechanical evaluation of material properties was performed using dynamic mechanical thermal analysis (DMTA), where basic viscoelastic properties were recorded during the temperature scan. For all of the tested materials, the test temperature ranged from 25 °C to 200 °C, while the heating rate was 2 °C/min. The deformation of 0.01% was applied with a frequency of 1 Hz. The tests were conducted using a torsion mode clamp system. Sample assignments correspond to the polymer matrix type (PC, PBT, PET, or blend PET/PC or PBT/PC) and the used molding standard (with or without insert ). The reinforced samples were additionally marked with the fiber type BF, which corresponds to basalt fiber. File designation consists of:measurement type_material name and/or processing temperature