This work analyzes the quality of two types of commercial electro-technical-porcelain using textural and physical-chemical methods: BET surface area and pore size by gas adsorption, X-ray powder diffraction; Electronic Microscopy and Energy dispersive X-ray analysis, Infrared Spectroscopy and their water adsorption capacity by the Dynamic Speckle Laser technique. Experimental results showed the evolution of the speckle patterns during hydro-adsorption process, permitting to discriminate different behavior for each material. It was determined that it is possible to correlate changes in the speckle patterns with the porosity and chemical composition of materials.