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The study aims to analyze the strength properties obtained from three-point bending tests of epoxy-glass composite samples modified by adding rubber recyclate. A pure epoxy-glass composite is used as a comparative variant. The tested materials, which varies in the percentage of rubber recyclate and distribution, are cut through waterjet cutting to minimize the influence of temperature. The results undergo statistical analysis, and the microstructures are examined using scanning electron microscopy. The decreasing bending strength of the composites is observed, as the content of rubber recyclate in the material increased. However, adding rubber recyclate directly into the resin subtly decreases in bending strength compared to adding in the layers between the glass mat layers. Composites with rubber recyclate exhibits lower deflection under load compared to pure composites. The most favorable bending test parameters are obtained for the material containing 5% rubber recyclate distributed in three layers. [ABSTRACT FROM AUTHOR]

The paper presents acoustic studies of a multilayer composite made based on Synolite 1967-G-1 polyester resin and glass fabric with a three-way arrangement of +/-45° fibres, Triaxial type and a weight of 860 g/m2. As an addition, rubber recyclate created in the process of disposal of car tires was used. The material was made using the vacuum infusion method. By the vacuum lamination method, composite materials were produced in the form of plates with the addition of rubber recyclate in four variants of the amount of recyclate used in the produced composite - 20%, 30%, 40% and 50%. Each variant contained 6 layers of fabric and five layers of rubber recyclate. The samples were tested in the vibroacoustic laboratory on a dedicated measuring station of a set of reverberation chambers without flanking transmission, in which the specific acoustic insulation Rw was determined following PN-EN ISO 10140-2 and related standards, i.e. PN-EN ISO 10140-1, PN-EN ISO 10140-2, PN-EN ISO 10140-4, PN-EN ISO 10140-5 and PN EN ISO 717-1. All manufactured variants of the composite material with the addition of rubber recyclate were characterized by acoustic insulation in the range of Rw = (30.0 ÷ 35.7) dB. High sound insulation parameters for tested panels up to 12 mm thick act as a barrier to counteracting the spread of unwanted airborne noise. Combined with good mechanical properties such as tensile strength, toughness and hardness, they form the basis for the easy design of all shields in many industries. The use of rubber recyclate obtained in the process of disposal of car tires has a positive impact on improving environmental protection. [ABSTRACT FROM AUTHOR]