Two main by-products or wastes formed during the production of glass fibre are following: sewage sludge containing montmorillonite clay as sorbent material and ca 50 % of organic matter as well as waste glass from alumo-borsilicate glass fibre with relatively high softening temperature (> 600 oC). In order to elaborate different new ceramic products (porous or dense composites) the mentioned by-products and illitic clay from two different layers of Apriki deposit (Latvia) with illite content in clay fraction up to 80-90% was used as a matrix. The raw materials were investigated by differential-thermal (DTA) and XRD analysis. Ternary compositions were prepared from mixtures of 15 – 35 wt % of sludge, 20 % of waste glass and 45 – 65 wt % of clay and pressed green bodies were thermally treated in sintering temperature range from 1080 to 1120 oC in different treatment conditions. Materials produced in temperature range 1090 – 1100 oC with the most optimal properties - porosity 38 - 52 %, water absorption 39 – 47 % and bulk density 1.35 – 1.67 g/cm3 were selected for production of porous ceramics and materials showing porosity 0.35 – 1.1 %, water absorption 0.7 – 2.6 % and bulk density 2.1 – 2.3 g/cm3 - for dense ceramic composites. Obtained results indicated that incorporation up to 25 wt % of sewage sludge is beneficial for both ceramic products according to the technological properties. Structural analysis of elaborated composite materials were performed by scanning electron microscopy (SEM). By X-ray diffraction analysis (XRD) the quartz, diopside and anorthite crystalline phases were detected in new ceramic products.