The materials used in the composition of the upholstered product are composed of flammable organic materials, which may contribute in the event of fire to its development. In the diploma thesis we tested the textile fabrics and PUR foams, which make up a substantial part of the upholstery composition. The textile fabrics consisted of natural (cotton) and synthetic (PES, PP) fibres. There was a fabric retardant treatment Trevira CS among the textile fabrics. From the PUR foams we tested the soft foams of the following type: KF 5560, foam with a reduced flammability – DEFLAMO KF 4545, high-elastic V 4010, high-elastic with a reduced flammability VF 6020 and standard N 5063. For the evaluation of upholstery materials, we have chosen the method of thermal analysis in the experimental part – thermogravimetry, differential scanning calorimetry in the sense of standards: STN EN ISO 11358 (2000) and STN EN ISO 11357 – 1 (2000). The results proved the effect of retardation on the assessment parameters. The samples with a retardation treatment got better thermal stability than the samples without the retardation treatment. The smallest thermal stability was shown in the cotton fabric, where the weight loss was already recorded at 50 ˚C. The sample with a retardation treatment Trevira CS showed the highest thermal stability. Among the samples of PUR foams the lowest thermal stability attained the standard type. In a DSC analysis, all the samples showed significant exothermic effects. The endothermic effects were demonstrated in these samples – polypropylene, PES Trevira CS and PES fleece.