An impregnating material resistant up to 900°C, used in conjunction with SILCA calcium silicate products to strengthen the surface and 'bind' the dust. The impregnation material is inorganic, has a neutral smell and is suitable for additional preparation of SILCA 250 KM additional plate inside the fireplace. The product cannot be used as a primer for plastering or gluing. SILCACON primer should be used for these works. SILCADUR-HTI impregnation agent is easy to use, it can be sprayed or applied with a brush. SILCADUR HTI impregnation agent is intended for impregnation of tiles inside the fireplace.