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Different source of casein depending on their extraction method from milk are available on the market. Sheets from 3 different types of casein (rennet casein, acid casein and sodium caseinate) were developed using a dry process: extrusion. Casein sourcing, plasticizer concentration (13.2% w/w or 24.2% w/w) and relative humidity environment were studied for each sheet through color, density and porosity, water sensitivity and mechanical properties evaluation. A wide range of properties seems to be available through casein based sheets depending on casein source, which affected greatly water solubility (caseinates are 100% water soluble compare to acid and rennet casein). Besides, acid and rennet casein have different behaviour with water and even more with higher glycerol amounts. Indeed, rennet casein sheet is less sensitive to water than acid casein sheet at low glycerol concentration (13.2% w/w) but at …