Patent ID: 7910230

Claim:
A gypsum part having increased mechanical strength, comprising crystals of DH and/or HH calcium sulfate wherein the gypsum part is characterized by adhesion of hydrophilic surfaces of the DH or the HH crystals to each other via hydrogen bonding with a thin layer of interstitial water between the surfaces, the layer of water thereby providing a structural connection between the crystals with reduced dynamics among water molecules; where a preparation method of the gypsum part uses HH calcium sulfate powder from mineral origin or from chemical processes as the starting material and is characterized by the following steps: (i) humidification of HH calcium sulfate powder, (ii) compaction of humidified powder; (iii) drying at temperatures around 20 degrees C. to 70 degrees C.; characterized by the drying being performed between 60 degrees C. and 50 degrees C.; characterized by the drying time between 2 and 12 h; and where the method is characterized by the additional step of surface treatment of the part by means of paints, resins and/or sealing substances.