The aim of the study was to analyse the impact of raw material composition and agglomeration process on selected physical and chemical properties of cocoa powder products. The experimental material consisted of powder materials: cocoa, sucrose, glucose, milk for children, their mixtures and agglomerates. The scope of study included the analysis of selected physicochemical properties of test samples: water content, water activity, colour, flowability, bulk density, and wettability. It was found that a change of the basic composition of the raw material mixture as well as the use of the processing had a significant effect on the physical properties of the samples tested. The agglomeration process significantly influenced the water content and activity, colour, flowability (reducing the discharge time) and bulk density. In contrast, modification of fibre composition and agglomeration did not improve the reproducibility of a majority of the samples tested, with the exception of those whose composition was dominated by sucrose and/or glucose. In most cases, the statistical analysis showed a statistically significant effect of agglomeration on the properties investigated, but did not demonstrate any clear influence of modification of fibre composition. Based on the results obtained, a mixture in which sucrose was partly replaced by milk was indicated as an alternative to commercial products.